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- From: Bruce Hamilton <B.Hamilton@irl.cri.nz>
- Newsgroups: sci.chem,sci.answers,news.answers
- Subject: Sci.chem FAQ - Part 2 of 7
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- Date: Thu, 15 Jan 2004 22:07:52 +1300
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- Last-modified: 22 October 1999
- Version: 1.17
-
- Subject: 7. General Chemistry-related Information on the Internet
-
- Compiled by: Neil Flatter
- Lev A. Gorenstein
- Theodore Heise
- Mark Perks
- Mutilated by: Bruce Hamilton
-
- There are so many references that relate to chemistry on the Internet
- that this section could become overwhelming in size. Instead of trying to
- provide a comprehensive listing of all such sites, what follows is more a
- collection of pointers to other sources that carry a diverse range of
- material related to chemistry. By knowing where to look for an answer,
- these references should provide a springboard for an information search
- on the Internet. Specialist software and search engines are available to
- search for keywords using Gopher and the WWW, and they will also point to
- additional sources not accessed by the sites below.
-
- 7.1 How can I access databases such as Chemical Abstracts?
-
- These databases are almost all inevitably commercial, it costs serious
- money to build and update them, thus it will cost money to access them.
- Either you or your institution will be paying the supplier. Do not
- expect to find copyrighted databases ( such as the Merck Index, Chemical
- Abstracts, Kirk Othmer, or Sax ) freely available on the Internet.
-
- There are several commercial suppliers of databases that contain chemical
- information. These can usually be accessed either via the Internet or
- telephone Packet Switching Networks. The most well known specialist database
- is the American Chemical Society's Chemical Abstracts [1], which is provided
- by the Chemical Abstracts Service. CAS offers a commercial database service
- called STN International, which contains over 190 scientific and technical
- databases.
-
- These databases cover all aspects of Chemistry, including CAS
- Registry Numbers, and are accessible via the WWW.
- http://www.cas.org/ Chemical Abstracts Service.
- http://info.cas.org/stn.html STN Introduction
- http://www.dialog.com/ Dialog
-
- The most universal and comprehensive database supplier is Knight Ridder,
- whose Dialog service offers over 40 databases that solely concentrate
- on aspects of chemistry, including Chemical Abstracts since 1967 ( but it
- does not offer the actual abstract, just the bibliographic information )
- and the CAS RN database [2]. Dialog also offers several hundred other
- commercial and technical databases, and Knight Ridder also offers selected
- general and technical databases on a low-cost, home user ( off-peak :-) )
- system known as " Knowledge Index " at approx 25% of the normal Dialog cost.
- Knowledge Index is also available from some on-line suppliers such as
- Compuserve - but remember that KI does not include CA.
-
- The ability to perform on-line searches is becoming an essential attribute
- for modern chemists. Major database suppliers offer a wide range of training
- courses and there are several excellent articles on searching the chemical
- literature ( database and/or journals) in journals such as J.Chem.Ed.[3-5].
- If you have access to a CD-ROM database, you should practise your search
- logic on that first, before going on-line. Because of the cost structure of
- database suppliers such as Dialog, and the inappropriate selection of
- keywords by authors :-), it is often more cost-effective to focus on grabbing
- around 100-200 titles and scanning them offline ( using the 30 minutes
- "hold search" function ), and then going back online to grab the desired
- abstracts and citation information.
-
- 7.2 What chemistry-related material is on the WWW?
-
- Searching
-
- There are several well-known search engines available on the WWW that will
- provide updated searches for keywords. Because of the huge expansion of the
- WWW, I've decided to select some sites and allow users to use search
- engines and/or web crawlers to locate resources. If you find a real
- treasure house of chemical goodies, email me the address and I'll check it
- out. It is important to realise that many of the WWW search engines are
- complementary, and so it is useful to utilise several when trying to locate
- information on the web - good places to start are directories of various
- WWW search engines.
-
- http://home.netscape.com/home/internet-search.html
- http://cuiwww.unige.ch/meta-index.html
-
- Free search engines include:-
-
- http://altavista.digital.com/ Alta Vista
- http://www.google.com/ Google
- http://www.lycos.com/ Lycos
- http://www.yahoo.com/ Yahoo
- http://infoseek.go.com/ Infoseek
- http://www.excite.com/ Excite
- http://www.webcrawler.com/ Webcrawler
-
- Chemistry Overview sites
-
- http://chemfinder.camsoft.com/
- The fastest and best way to discover information about chemicals on
- the WWW is CambridgeSoft Corporation's Chemfinder free searching
- server. This has to be one of the most convenient ways to obtain
- chemical information on the Internet. Highly recommended.
-
- http://www.chemsoc.org/crl/links.htm
- The Royal Society of Chemistry maintains an excellent list of sites
- containing chemistry-related material, and is a good starting point.
-
- http://www.chemcenter.org/
- This is the new WWW site from the American Chemical Society, and
- is intended to be their prime location of chemical information.
-
- Other very useful sites include;-
- http://www.chemdex.org/
- The University of Sheffield comprehensive listing of WWW Chemical info.
- Over 2200 sites indexed as of September 1996.
- http://www.chemie.uni-regensburg.de/external.html
- List of Chemical Services and Resources
- http://webbook.nist.gov/
- Comprehensive compilation of the NIST Chemistry WebBook, which
- includes thermochemical, IR, and mass spectral data.
- http://www.chem.ucla.edu/chempointers.html
- The World-Wide Web Virtual Library: Chemistry.
- http://rustico.chem.indiana.edu/
- Gary Hieftje's site, covering many aspects of spectrochemistry.
- http://www.indiana.edu/~cheminfo/
- Gary Wiggins' extensive compilation of WWW chemical sites.
- http://www.netsci-journal.com/
- Internet Journal of Science - Biological Chemistry
- http://www.cas.org/
- Chemical Abstracts Service offers a diverse range of information
- with a search facility.
- http://www.camsoft.com/
- CambridgeSoft site, ChemDraw, glassware, clip-art
- http://www.chem.vt.edu/chem-ed/vt-chem-ed.html
- The Chemistry Hypermedia project, especially chemical education.
- http://www.rpi.edu/dept/chem/cheminfo/chemres.html
- Another listing of Chemistry Internet Resources
- http://dir.yahoo.com/science/chemistry/
- The searchable Yahoo Collection of Chemistry Resources
- http://www.mdli.com/
- Home of the ISIS/DRAW chemical structure drawing programme
- ( free for academic and personal home use ).
-
- Chemistry Education
-
- Many of the WWW chemistry directories above also have extensive links to
- educational resources, services, and institutions:-
-
- http://www.chemdex.org/
- http://www.chemie.uni-regensburg.de/external.html
- http://www.chem.ucla.edu/chempointers.html
- http://www.indiana.edu/~cheminfo/
- http://www.chem.vt.edu/chem-ed/vt-chem-ed.html
-
- Additional useful sites include:-
- http://jchemed.chem.wisc.edu/
- Journal of Chemical Education Online.
- http://www-hpcc.astro.washington.edu/scied/chemistry.html
- A comprehensive listing of education resources.
- http://www.inform.umd.edu:8080/UMS+State/UMD-Projects/MCTP/Technology/Chemistry.html
- Internet Resources for Science and Mathematics Education compiled
- by Tom O'Haver.
- http://www-sci.lib.uci.edu/SEP/SEP.html
- UC Irvine Science Education Program, not only chemistry.
- http://ice.chem.umbc.edu/Chem351l/index.html
- Typical University Organic Chemistry Laboratory information.
- http://http://scifun.chem.wisc.edu/scifun.html
- Bassam Shakhashiri's home page - full of entertaining information.
-
- Other Chemistry-related Resources
-
- http://www.che.ufl.edu/WWW-CHE/index.html
- The Virtual Chemical Engineering Library
- http://electrochem.cwru.edu/estir/
- The Electrochemical Science and Technology Information Resource.
- http://www.improb.com/
- For the best science satire around, check out the Annals of Improbable
- Research, successor to the Journal of Irreproducible Results. Whilst
- the full version is only available via subscription services, such as
- ClariNet, smaller items are published free in the Mini AIR.
- http://www.chemheritage.org
- Chemical Heritage Foundation site about history of chemical industry
- http://www.acdlabs.com/
- Diverse range of chemistry drawing, interpretation, and modelling software.
-
- General Education Resources
-
- Many of the Chemistry Overview sites also point to general science sites,
- and use of the large search engines is recommended, but some additional
- sites include:-
- http://www.ccc.uni-erlangen.de/jmolmod/index.html
- Journal of Molecular Modeling
- http://www.inform.umd.edu:8080/UMS+State/UMD-Projects/MCTP/Technology
- /MCTP_WWW_Bookmarks.html
- Internet Resources for Science and Mathematics Education compiled
- by Tom O'Haver.
-
- Chemical Reference Spectra
-
- http://webbook.nist.gov/
- Comprehensive compilation of the NIST Chemistry WebBook, which
- includes thermochemical, IR, and mass spectral data.
-
- 7.3 What information is available commercially on-line?
-
- As well as the database suppliers such as Knight-Ridder's Dialog ( and
- low-cost home-user Knowledge Index ) and CAS's STN International, there are
- several other technical database suppliers that include chemistry-related
- material, eg Orbit. These organisations usually approach institutional
- librarians and provide comprehensive descriptions of their available
- services. The best place to start is at your local library, talking to the
- librarian in charge of on-line services to ascertain what is available, and
- what levels of support are provided.
-
- The obvious first places to start are Dialog and STN. The range of chemistry-
- related databases are extensive. There are several full-text databases of
- patents, full-text newspapers and journals, and many specialised databases.
- - industry-specific Aluminium Industry Abstracts, Paperchem
- - subject-specific Fine Chemicals Database, Chemical Engineering and
- Biotech Abstracts
- - chemical properties Beilstein, Heilbron, Merck Index, Agrochemicals
- Handbook
- - location-specific IMS World R&D focus.
- - chemical market Chemical Business Newsbase, Chemical Industry Notes,
- Freedonia Market Research.
-
- If you plan on using Knight Ridder's lower cost Knowledge Index, ensure that
- the databases you are interested in are available on KI, as not all Dialog
- databases are.
-
- With nearly 200 databases on STN and approximately 500 on Dialog, they both
- offer access to a wide range of information. For more specialist information,
- accessing individual businesses is required, and they can provide specialist
- sales, marketing and technical support for their products - many such
- businesses are now accessible via the WWW. There are also the various
- registry companies like Thomas that list chemical and equipment suppliers,
- and who also offer a free evaluation period:-
- http://www.thomasregister.com/
-
- 7.4 What information is available free on-line?
-
- The best technique is to use a WWW search engine to locate information
- you desire, but some interesting locations are listed below.
-
- http://chemfinder.camsoft.com/
- CambridgeSoft Corporation's Chemfinder free searching server will
- locate much of the diverse information about chemicals ( physical
- properties, CAS RN, MSDS, etc. ) available on the Internet.
- http://chemistry.mond.org/
- Chemistry Today is a daily news service that can also be obtained
- by email.
-
- Several science journals are now making some of their commentary items and
- abstracts available on the WWW, however subscriptions are still required
- for access to the full journal. These include:-
- http://www.nature.com/ Nature
- http://www.newscientist.com/ New Scientist
-
- Many of the Journals published by the American Chemical Society and Royal
- Society of Chemistry also have homepages or articles available. The ACS
- index also includes some of the UK and Japanese journals as well.
-
- American Chemical Society
- http://pubs.acs.org/about.html ACS Journal Index
- http://pubs.acs.org/journals/cenear/about.html Chemical & Engineering News
- http://dchas.cehs.siu.edu/Magazine/default.htm Chemical Health & Safety
- http://pubs.acs.org/journals/ancham/index.html Analytical Chemistry
- http://pubs.acs.org/journals/esthag/index.html Environmental Science
- and Technology
- http://pubs.acs.org/journals/jacsat/index.html Journal of the American
- Chemical Society
- http://pubs.acs.org/journals/joceah/index.html Journal of Organic
- Chemistry
-
- Royal Society of Chemistry
- http://www.rsc.org/is/journals/j1.htm RSC Journal Index
- http://www.rsc.org/is/journals/current/jcr/jcrpub.htm Journal of Chemical
- Research
- http://www.rsc.org/is/journals/current/oprd/oprpub.htm Organic Process R&D.
-
- Society of Chemical Industry
- http://ci.mond.org/ Chemistry & Industry
-
- The Bulletin of the Chemical Society of Japan homepage is also available
- via the ACS publications page.
- http://pubs.acs.org/journals/bljapan/about.html
-
- 7.5 What chemical patent information is available on-line?
-
- Both Dialog and STN offer commercial access to US and International patents
- online, many with full text - however the international ones, especially
- those devoted to capturing the current status of patents can be expensive,
- so ensure your searching skills are honed if you wish to avoid a large
- bill.
-
- http://patent.womplex.ibm.com/
- http://www.patents.ibm.com/
- A new site that offers free searching of the last 20+ years of US
- patents, and also provide the abstracts, some images, and the claim
- summary free. Complete copies of the patents can also be ordered.
- It has a good search engine, and probably should be the first site to
- visit, but note that it requires a browser that supports frames
- (eg version 3 of Netscape or Internet Explorer).
- http://metalab.unc.edu/patents/intropat.html STO Patent retrieval service
- Gregory Aharonian has struggled for several years to provide a free,
- comprehensive patent title service. This excellent free service offers
- the titles of chemical, mechanical, or electrical patents via email
- to subscribers. Recently he also offered one years worth of patent
- abstracts, but requires some financial donations to expand the
- service. The abstracts are freely retrievable by patent number (sorry
- no searching yet, that needs the big donations). For subscription info,
- send 'help' to patents@world.std.com.
- http://www.uspto.gov/patft/index.html USPTO/CNIDR Patent Project
- This page provides access to both the U.S. Patent Bibliographic
- Database, which includes bibliographic data from 1976 to 1997, and
- the AIDS Patent Database, which includes the full text and images
- of AIDS related patent issued by the U.S., European and Japanese
- Patent offices.
-
- 7.6 Which FTP sites contain chemistry-related material?
-
- ftp://kekule.osc.edu/pub/chemistry/
- Jan Labanowsky's server, also contains an archive of the computational
- chemistry mailing list.
- ftp://qcpe6.chem.indiana.edu/
- QCPE archive
- ftp://oak.oakland.edu/pub/simtelnet/
- Dos and Windows public domain and shareware
-
- 7.7 What chemistry-focused mailing lists exist?
-
- LISTSERV@Beaver.Bemidji.MSUS.edu
- Chemistry laboratories (both academic and research), students'
- experiments (high school, college and university), classroom
- demonstrations and shows for the public of chemical processes,
- chemistry stockroom management, lab safety, and small-scale chemical
- waste handling procedures.
-
- 7.8 How can I contact Chemical Societies electronically?
-
- In general, most WWW sites will also contain email addresses that they
- can be contacted through.
-
- http://www.acs.org/
- The American Chemical Society homepage provides access information,
- and additional email support is available via the following:-
- division@acs.org ACS Division information
- expo@acs.org ACS expositions
- meminfo@acs.org ACS membership information
- natlmtgs@acs.org ACS national meeting information
- rxnt@acs.org Reaction Times (college newspaper)
- reglmtgs@acs.org ACS regional meeting information
- slga@acs.org ACS state and local government affairs
-
- http://www.rsc.org/
- marketing@rsc.org
- The UK Royal Society of Chemistry, WWW and email address.
- http://sci.mond.org/
- The UK Society of Chemical Industry.
- http://www.gdch.de/
- pr@gdch.de
- The German Chemical Society (Gesellschaft Deutscher Chemiker, GDCh)
- http://wwwsoc.nacsis.ac.jp/csj/index-e.html
- The Chemical Society of Japan ( English index )
-
- 7.9 How can I contact large chemical companies?
-
- Check their WWW pages for information.
- http://www.argus.it/ Argus Chemicals
- http://www.dow.com/ Dow Chemicals
- http://www.eastman.com/ Eastman Chemicals
- http://www.ge.com/plastics/ GE Plastics
- http://www.hoechst.com/ Hoechst
- http://www.lilly.com/ Eli Lilly
- http://www.monsanto.com/ Monsanto
- http://www.chemfirst.com/qci/ Quality Chemicals
- http://www.rohmhaas.com/ Rohm and Haas
- http://www.sigma-aldrich.com/ Sigma, Aldrich and Fluka
- http://www.sumitomo-chem.co.jp/ Sumitomo Chemicals
-
- You can observe the naming conventions, so try www.company-name.com for
- other companies not listed, and you can also try using the on-line version
- of the Thomas Register.
- http://www.thomasregister.com/
-
- 7.10 How can I contact chemical suppliers?
-
- Several major chemical suppliers now have on-line catalogues on the WWW.
- http://www.sigma-aldrich.com/
- Sigma, Aldrich, Fluka, and Riedel de Haen chemical catalogues
- http://www.fisherscientific.com/
- Acros Chemicals catalogue
- Fisher Chemical catalogue
- http://www.romil.com/
- Romil Chemicals catalogue ( high purity chemicals )
-
- Check out the FAQs in rec.pyrotechnics and alt.drugs, they may also list
- some legal suppliers. With the rapid growth of the WWW, it is usually
- a good idea to conduct a search to locate suppliers, and you could try
- the Chemsources or Thomas Register sites to locate addresses.
- http://www.chemsources.com/
- http://www.thomasregister.com/
-
- Use of WWW search engines and specific terms like "biochemicals"
- will locate the WWW and email addresses of speciality suppliers
-
- 7.11 How can I contact equipment suppliers
-
- Check out the FAQs in rec.pyrotechnics and alt.drugs, they may also list
- some legal suppliers. With the rapid growth of the WWW, it is usually
- a good idea to conduct a search to locate suppliers on the Internet,
- and using the Thomas Register site to locate suppliers not on the Internet.
-
- http://www.thomasregister.com/
- Thomas Register ( manufacturers and suppliers )
- http://www.sigma-aldrich.com/
- Sigma, Aldrich, Fluka and Supelco ( techware and books )
- http://www.fisherscientific.com/
- Fisher Catalogue ( general lab equipment )
-
- 7.12 How can I contact US government agencies?
-
- http://www.fedworld.gov/
- telnet://fedworld.gov/
- FedWorld Information Network at the National Technical Information
- Service NTIS) was created "to provide a one-stop location for the public
- to locate, order, and have delivered to them, U.S. Government
- information."
- gopher://marvel.loc.gov/11/federal/fedinfo/byagency/executive
- Executive Branch Gophers (Library of Congress)
- http://www.nist.gov/
- National Institute of Standards and Technology
- http://www.atsdr.cdc.gov/atsdrhome.html
- Agency for Toxic Substances and Disease Registry (Searchable)
- http://www.dot.gov/
- Department of Transportation
- http://www.epa.gov/
- Environmental Protection Agency
- http://www.fcc.gov/
- Federal Communications Commission
- http://www.access.gpo.gov/
- Government Printing Office
-
- 7.13 Where can I find compilations of science humour?
-
- http://www.improb.com/
- For the best science satire around, check out the Annals of Improbable
- Research, successor to the Journal of Irreproducible Results. Whilst
- the full version is available via subscription services, such as
- ClariNet, smaller items are published free in the Mini AIR.
- ftp://ftp.in.umist.ac.uk/pub/Text/scijokes.zip
- http://www.xs4all.nl/~jcdverha/scijokes/
- A huge 500kB compilation of science jokes regularly posted to Usenet.
- http://dir.yahoo.com/Entertainment/Humor/By_Topic/Science/
- Annals_of_Improbable_Research/
- Search selections from the Annals of Improbable Research
-
- 7.14 Where can I purchase scientific software?
-
- Aldrich and Fisher sell software, as do some of the Chemical Societies
- http://www.sigma-aldrich.com/
- Sigma, Aldrich, Fluka and Supelco
- http://www.fisherscientific.com/
- Fisher Catalogue
- http://www.acdlabs.com/
- Diverse range of chemistry drawing, interpretation and modelling software.
-
- Refer also to "Chemistry Overview Sites " and "Other Chemistry-related
- Resources" in section 7.2.
-
- ------------------------------
-
- Subject: 8. Laboratory and Chemical Safety Information on the Internet
-
- Compiled by: Neil Flatter
- Lev A. Gorenstein
- Theodore Heise
- Mark Perks
- Mutilated by: Bruce Hamilton
-
- 8.1 Where can I find Material Safety Data Sheets?
-
- Manufacturers are required by OSHA to provide MSDSs for the chemicals they
- produce, but most include liability disclaimers. For MSDSs obtained from
- online sources, the user must be sure the MSDS meets his/her needs. As with
- most information obtained from the Internet, use at your own risk!. If you
- don't know how to interpret the data, find an expert to explain the
- significance of the information presented. Because the number of WWW sites
- with MSDS are changing all the time, it is often preferable to use a WWW
- search engine to find the latest sources of data sheets.
-
- http://hazard.com/msds/
- http://haz1.siri.org/
- The comprehensive Vermont SIRI location is an excellent first port of
- call when searching for chemical safety information. ~180,000 MSDS
- http://msds.pdc.cornell.edu/issearch/msdssrch.htm
- The Cornell site mirrors the Vermont SIRI site and also contains the
- US Department of Defence CD-ROM MSDS. ~325,000 MSDS
- http://www.ilpi.com/msds/
- The Dept. of Chemistry, University of Kentucky, maintains an up-to-date
- " Where to find MSDS on the Internet " site pointing towards over
- thirty useful locations.
- http://chemfinder.camsoft.com/
- CambridgeSoft Corporation's Chemfinder free searching server will also
- locate safety information for chemicals, including ~60,000 MSDS.
- http://www.fisherscientific.com/
- The Fisher Scientific Chemical Catalog is available online. In addition
- to MSDSs, you can order chemicals.
- http://ulisse.etoit.eudra.org/Ecdin/Ecdin.html
- Environmental Chemicals Data and Information Network in Italy provides
- a searchable database with 120,000 MSDS.
-
- 8.2 Where can I find detailed safety & toxicity data?
-
- http://hazard.com/msds/
- http://haz1.siri.org/
- The comprehensive Vermont SIRI location is an excellent first port of
- call when searching for chemical safety information.
- http://chemfinder.camsoft.com/
- CambridgeSoft Corporation's Chemfinder free searching server will
- also locate safety information on chemicals, including MSDS.
- http://www.atsdr.cdc.gov/atsdrhome.html
- The Agency for Toxic Substances and Disease Registry (ATSDR) at the
- Centers for Disease Control maintains a searchable database which
- contains toxicological profiles of about 200 chemicals.
-
- Note that many government departments now have made their databases
- available to both commercial database suppliers ( such as Knight Ridder )
- and private citizens. Some are free, and some charge, it is worth contacting
- government agencies like OSHA, NIOSH, EPA, NIH and asking about what is
- available. Some databases ( like NIH library ) can be accessed via telnet,
- as also can Dialog ( once you have an account number ). eg
- http://www.ncbi.nlm.nih.gov/PubMed/medline.html
- Medline, a medical database maintained by the NIH
- telnet://Dialog.com
-
- 8.3 Where can I find occupational exposure limits?
-
- http://www.acgih.org/
- The most well-known list of occupational exposure limits is the annual
- list of TLVs and BEIs compiled by the ACGIH, who also offer a diverse
- range of reports and pointers to other sources of information.
- http://law.house.gov/cfr.htm
- Recent (but perhaps not most current, but it is being updated) site
- for the Code of Federal Regulations. Title 29 of the CFR (Labor)
- section 1910.1000 lists OSHA's permissible exposure limits (PELs)
- for air contaminants.
-
- 8.4 Where can I find hazard information for a chemical?
-
- In general, the first contact should be the safety professional at your
- institution, local poison centre or local fire department - as they will
- be trained to review and comprehend the information they have access to.
- A WWW visit to the sites in sections 8.1 and 8.2 will also provide some
- information, and point to other sources. The following site has pointers
- to several useful sources.
- http://www.christie.ab.ca/safelist/
- Carolla Christie of Christie Communications maintains an excellent
- list of environmental and occupational health and safety information
- resources available on the Internet. Many of the useful organisation
- and institutional resources currently are only contactable via email.
-
- 8.5 Where can I find laboratory safety guides?
-
- http://www.christie.ab.ca/safelist/
- Carolla Christie of Christie Communications maintains an excellent
- list of environmental and occupational health and safety information
- resources available on the Internet.
- http://www.sra.org/riskanal.htm RISKANAL mailing list.
- discusses environmental and occupational health and safety issues,
- particularly those associated with college and university campuses,
- although a wide range of subjects is encouraged.
-
- 8.6 Where can I find other safety information?
-
- Many of the Chemistry Overview WWW sites in Section 7.2 also have safety
- sections with extensive numbers of pointers to WWW sites. Some US
- Government departments ( OSHA, EPA, NIH ) have WWW sites with information,
- which can be accessed directly, or via some of the sites in Section 7.12.
- http://dchas.cehs.siu.edu/
- The ACS division of Chemical Health and Safety homepage.
- http://www.setac.org/
- The Society for Environmental Toxicology and Chemistry
- http://www.aiha.org
- The American Industrial Hygiene Association
-
- The WWW site below has large numbers of pointers to other sites with
- extensive ranges of information on chemical, laboratory, and general
- safety issues.
- http://www.christie.ab.ca/safelist/
- Carolla Christie of Christie Communications maintains an excellent
- list of safety information resources available on the Internet.
- The list is also posted to the SAFETY mailing list above.
-
- ------------------------------
-
- Subject: 9. Traditional General Chemistry Information Sources
-
- 9.1 When can I find Chemical Abstracts?
-
- Chemical Abstracts is produced by the ACS and is available either in
- hardcopy or CD-ROM form in most institution libraries that have a chemistry
- department. It is expensive, and is also available commercially from several
- online database suppliers ( refer to Section 7.1 ). It is not legally
- available free over the Internet. Some libraries have accidentally enabled
- limited search access for anonymous users, but this is usually soon
- curtailed, so enjoy them while you can :-).
-
- If your school does not have access, the librarian should be able to
- ascertain the nearest library that holds the hardcopy CA and also permits
- public access. CA volumes are not available for interloan. All chemicals are
- given an arbitrary Registry Number as they are encountered by the Chemical
- Abstracts Service ( Section 12.1 ). Many information sources now also use
- the CAS RN to overcome potential nomenclature confusion.
-
- 9.2 Where can I obtain chemical patent information?
-
- Most governments have a patent office, and there are usually branches in main
- centres. If you are able to obtain access to the patents at the patent office,
- and are familiar with patent codes, or know the patent number, the cost will
- be lower than using a patent attorney. If you do not know how to search for
- patents, and your time is valuable, you will find that using a patent
- attorney will be very cost effective. An excellent guide to the general
- concepts of patents and what you can expect to find, along with the
- advantages and disadvantages, is " What Every Engineer Should Know About
- Patents" [1].
-
- 9.3 Where can I purchase chemicals?
-
- The chemicals usually found in home chemistry sets can usually be purchased
- at the shop where the set was obtained, or the local hardware shop or
- pharmacist, provided the chemical is not subject to government or state
- restrictions. Many chemicals are only available to approved purchasers.
- If the chemical is used for a hobby, then it is very likely the FAQ for that
- Usenet group ( eg rec.pyrotechnics ), will contain information on suppliers.
- Most national chemical societies publish an annual listing of suppliers with
- their journals. Standard trade directories ( eg Chem Sources [2,3] and OPD
- Chemical Buyers Directory [4] ) list companies who specialise in chemicals,
- however few will be interested in small purchases.
-
- Smaller specialist and boutique suppliers are usually more likely to sell
- small quantities of chemicals to individuals. Most larger suppliers of high
- purity laboratory and industrial chemicals ( eg Aldrich-Sigma [5], J.T.Baker
- [6] ) will only sell a limited range of chemicals to individuals , and
- usually do not provide any discounts for individuals - unless they have an
- account with the company. I'm not sure about the US, but here in NZ discounts
- can halve the price of most chemicals.
-
- If you are intending to acquire a wide range of chemicals over time, an
- account may be a good idea, however remember that you may then be subject to
- inspection visits by regulators if you purchase certain chemicals. Most
- government and corporate organisations and laboratories also have policies
- of not supplying unknown individuals with *any* chemical. Some chemical
- suppliers are also accessible via the Internet ( refer Section 7.10 )
-
- 9.4 Where can I purchase laboratory equipment?
-
- As with chemicals, simple laboratory equipment can be purchased from the
- suppliers of home chemistry sets. Some government and state authorities
- require certain equipment ( eg stills ) to be registered, especially if it
- can be used to produce illegal substances. Most larger suppliers may
- require an account, but often specialist supplies can be purchased from
- hobby shops such as home brew kit suppliers. Once again the FAQ of
- relevant newsgroups ( such as alt.drugs and rec.pyrotechnics ) may provide
- the names of suppliers, as can trade directories and the Yellow Pages.
- Cole Palmer and Fisher offer free comprehensive catalogues that identify
- what is available. Some equipment suppliers are accessible via the Internet
- ( refer Section 7.11 ).
-
- 9.5 What reference texts should I search first?
-
- If you require basic physical information about a chemical then many
- chemical suppliers catalogues also include common properties - such as
- boiling point, melting point, density, and flash point. Aldrich, Merck,
- and Lancaster provide information on organic chemicals, and Sigma covers
- biochemicals. Chemical catalogues also often provide cross references to the
- Chemical Abstracts Registry Numbers, the Merck Index, spectral libraries,
- safety, and preparation information. The actual product purity may limit the
- accuracy of the data, and more accurate information could be available
- in the Rubber Handbook or Merck Index. As catalogues are usually free on
- request ( Aldrich catalogue is also available on disk as a searchable
- database for $25 ), they are an excellent initial information source that
- will often direct you to appropriate reference texts. You may be able to
- acquire an older edition by asking your chemistry teacher or chemical
- storeroom supervisor.
-
- Depending on the type of chemical information required, some specialist
- reference texts may be required, but there are several texts that are common
- to most fields of chemistry. These are usually found in the reference
- section of most public and technical libraries and, because they are often
- heavily discounted for students, many chemists have copies of several of
- them. If your library does not have them, ask some of your teachers for
- access to their personal copy.
-
- Many of these texts are now also available on CD-ROM, usually at a slightly
- lower cost than the hardcopy, however the Merck Index is an exception where
- the CD-ROM version costs significantly more than the hardcopy. The Merck
- Index is an excellent starting point for information on organic chemicals
- used in the agricultural, biochemical, chemical, and pharmaceutical
- industries. It is usually available, along with the Rubber Handbook, in the
- reference section of libraries. Don't expect a $7,000 encyclopedia set like
- Kirk Othmer to be freely available over the Internet, or available on
- CD-ROM for $100 :-). I have also marked those that are commercially
- available through online services with an asterisk.
-
- For more detailed aspects of individual compounds, common texts include:-
-
- CRC Handbook of Chemistry & Physics ( aka Rubber Handbook ) [7]
- - tabulations of diverse chemical and physical properties.
- - start here for physical data with minimal description.
- The Merck Index * [8]
- - brief monographs on most common organic chemicals, especially those
- used in the chemical, biochemical, and pharmaceutical industries.
- - excellent source for physical and physiological properties, common
- names, and CAS RN.
- - monographs point to more descriptive sources.
- - available on CD-ROM, but the hardcopy version is much cheaper.
- Lange's Handbook of Chemistry [9]
- - tabulations of chemical properties.
- Hawley's Condensed Chemical Dictionary [10]
- - very brief monographs on a wide range of common industrial chemicals.
- - very good starting point to ascertain physical properties of both
- inorganic and organic chemicals used in commerce.
- - Available on CD-ROM
- Tables of Physical and Chemical Constants ( aka Kaye and Laby ) [11]
- - tabulations of constants, often not in the Rubber Handbook
- The Chemical Technicians' Ready Reference Handbook [12]
- - tabulations of various common chemicals and materials.
- The Matheson Gas Data Book [13]
- - tabulations of properties of a diverse range of gases
-
- There are several good general "science" texts that provide basic coverage
- of aspects of chemistry, eg the concise version of the McGraw Hill
- Encyclopedia of Science and Technology [14] or Van Nostrand's Scientific
- Encyclopedia [15]. There are also several single volume chemistry books
- that provide brief monographs covering diverse aspects of chemistry, such as
- the McGraw Hill Encyclopedia of Chemistry [16]. These texts are often found
- in the reference sections of general libraries.
-
- The next source is usually the encyclopedia sets that are also found in the
- reference section of general libraries. There are some general ones that
- cover all fields of science, and often have annual updates. An example is
- the 20 volume McGraw Hill Encyclopedia of Science and Technology, available
- in hardcopy or CD-ROM versions [17].
-
- For more detailed, but still with general coverage, there are at least two
- popular large multi-volume chemistry encyclopedias. One, or both, of these
- is usually found in the reference sections of technical and large public
- libraries. These have become the standard first point of reference for
- information on properties, production, and applications of industrial
- chemicals.
-
- Kirk Othmer Encyclopedia of Chemical Technology - 4th edition * [18]
- - excellent 27 volume set
- - extensive monographs on chemical families and processes.
- - start here if you wish to obtain up-to-date, easy-to-read, comprehensive
- technical information on an amazingly diverse range of chemistry.
- ( available in hardcopy ($324/volume, around $7,000/set), online, on
- CD-ROM, and as a greatly-abridged concise volume (3rd Edition = $110)
-
- Ullmann's Encyclopedia of Industrial Chemistry - 5th edition [19]
- - excellent translation from the original German edition.
- - extensive monographs on common industrial processes
- - the style is different to Kirk Othmer in that information is not so well
- integrated into the monograph, but often contains more hard information
- and good reviews of specific topics.
- ( In 1997 the fifth edition was made available on CD-ROM, with the sixth
- edition was started in 1998, with each CD holding the equivalent of
- three printed volumes. The full book/CD-ROM sixth edition will cost
- around $14,000 )
-
- There are also the very large multi-volume sets of specialised chemical
- information that are mainly only found in institutions that have a strong
- chemistry or chemical engineering component, such as:
-
- Beilstein * [20]
- - provides detailed monographs of most organic chemicals, covering
- preparation, properties and structure.
- Gmelin [21]
- - provides detailed information on most elements and inorganic chemicals
- Heilbron * [22]
- - provides short monographs of many organic compounds, mainly listing
- properties and references to preparations. An excellent way to
- quickly find information on chemicals.
- McKetta - Encyclopedia of Chemical Processing and Design [23]
- - extensive monographs containing technical data on chemical processes.
- Encyclopedia of Polymer Science and Engineering - 2nd edition * [24]
- ( available in hardcopy, online, and in a greatly-abridged concise volume )
- - detailed monographs on common polymers and processes
- Thorpe's Dictionary of Applied Chemistry [25]
- - getting old, but *still* contains lots of excellent information on the
- properties and industrial applications of chemicals
- - is very useful for historical information on how a product developed.
-
- For more specialised references, refer to the appropriate section of this
- FAQ, however I will list a few texts covering general laboratory techniques
- not mentioned elsewhere. If your local bookshop does not carry specialist
- technical books, many are also available from appropriate chemical and
- equipment suppliers, such as Aldrich-Sigma and Supelco.
- Vacuum = High Vacuum Techniques for Chemical Syntheses and Measurements [26].
- = High Vacuum Techniques [27]
- Pipework = Swagelok Tube Fitting and Installation Manual [28]
- Thermocouples = Thermocouples: Theory and Practice [29]
- ( The Omega catalogues are also a good source of practical information
- on a wide range of temperature, flow and pressure sensors )
- Many of the laboratory safety texts also include sections on design and
- management of laboratories.
-
- 9.6 Where can I find physical and spectral properties of chemicals?
-
- Some chemical suppliers catalogues ( eg Aldrich [5] ), also include common
- properties such as boiling point, melting point, density, flash point.
- Most will provide a catalogue free on request, but it is often easier to
- obtain an obsolete edition from your institution, as they usually just throw
- them out. The most information is often in catalogues from international
- laboratory chemical suppliers ( eg J.T.Baker [6], Merck [30], Rhone-Poulenc
- [31] ), and specialist organic chemical suppliers ( eg Aldrich [5],
- Sigma [32], Janssen [33], Lancaster [34] ), however it should be remembered
- that the product purity will affect the value reported, and that more
- accurate values may be available in references such as the Merck Index or
- Rubber Handbook.
-
- Once you have checked the catalogues, and checked the standard texts above,
- then more specialised compilations should be checked. For spectral
- properties, there are several large compilations of detailed spectral
- properties, including infra-red [35-37], NMR [38-40], and mass-spec [41,42].
- These are usually located near the instruments, rather than in the library,
- however the NIST IR and mass spectral libraries are accessible via the WWW
- ( refer Section 7.2 ).
-
- Most transportation safety compilations and MSDS also list common physical
- properties, as do the most of the encyclopedia sets ( refer Section 9.5 ).
- More specialised information is usually found in specialist books or
- journals, such as the Journal of Chemical and Engineering Data.
-
- 9.7 Where can I find production data for commercial chemicals
-
- Both Kirk Othmer and Ullmann tabulate production data, and identify
- major manufacturers, and more recent information is found in monographs
- in CMR. C&EN also tabulates production data for the major industrial
- chemicals and publishes an annual listing of the top 50 chemicals. Lists of
- manufacturers of chemicals are found in compilations such as Chemical
- Sources [2,3] and trade directories. There are also industry organisations
- such as the Chemical Manufacturers Association that maintain records of
- production. Specialist industry journals usually provide annual surveys
- of production and capacity. Government departments ( often the Dept. of
- "Trade & Industry" or "Commerce" ) also compile national production
- statistics.
-
- 9.8 Where can I find the composition of a proprietary chemical?
-
- If it has been patented, the composition will be detailed in the patent,
- and any local patent agent should be able to locate and obtain a copy.
- Transportation regulations usually require manufacturers to list components,
- consequently examination of the MSDS often provides an indication of major
- components, some of which are likely to just be the solvent. There are also
- compilations of chemical tradenames that may also indicate what the major
- components in a proprietary chemical. Hawley, Gardner, Industrial
- Chemical Thesaurus [43], Encyclopedia of Industrial Chemical Additives [44],
- and the Chemical Tradenames Dictionary [45] are good starting points.
-
- In some countries only the "active" or "toxic" ingredients have to be
- disclosed, consequently chemical analysis would have to be undertaken.
- Another technique is to look for equivalent formulations - to ascertain what
- ingredients are typically used, and the multi-volume Chemical Formulary [46]
- is one of the best sources if you can not justify a patent search.
-
- 9.9 Where can I find out about the history of Chemistry?
-
- There is a soc.history.science Usenet group that is very knowledgeable and
- active, and includes individual events in the history of chemistry. There
- are usually several overview books on the history of chemistry in most school
- and public libraries, and example is "The History of Chemistry" by J.Hudson
- [47]. There are also several outstanding biographies of famous chemists, and
- many chemical societies and chemical firms have commissioned books on
- specific aspects of chemistry history. The Journal of Chemical Education
- often has articles on specific historical aspects of chemistry.
-
- 9.10 Where can I find out about the discovery of an element?
-
- The Rubber Handbook has a monograph on each element, including a brief
- discussion of the discovery. "Chemistry of the Elements" by Greenwood and
- Earnshaw [48], and "The Elements" by Emsley [49], also provide good
- discussions, and Gmelin provides a fairly comprehensive discussion of
- discovery of each element. In each of the above, the discovery of each
- element is taken in isolation. The best general overview that provides a
- cohesive framework explaining the overall progression of discoveries, is
- "Discovery of the Elements" by Weeks [50], and it should be available in most
- libraries. For the more recent elements, there usually are brief reports and
- discussions in C&EN and the Journal of Chemical Education.
-
- 9.11 What inspirational books about chemistry should I read?
-
- Do they exist :-)?. You could try "The Chemical Bond: Structure and Dynamics"
- edited by A.Zewail [51]. It contains articles by several Nobel Laureates.
-
- If you want to be entertained, and only have time for a short read, try the
- "Chemistry in the Next Century" [52] article in Industrial and Engineering
- Chemistry written in May 1935 by Thomas Midgley, Jr.. He was responsible for
- the discovery and development of CFCs and alkyl lead octane enhancers for
- gasoline - two chemical developments that became so pervasive and useful
- that their use resulted in unintentional environmental pollution.
- For a brief story about their discovery, try "Midgley - Saint or Serpent"
- [53] in Chemtech. It confirms that old saying " Luck is when preparation
- meets opportunity ".
-
- ------------------------------
-
- Subject: 10. Traditional Laboratory and Chemical Safety Information Sources
-
- 10.1 Where can I find Material Safety Data Sheets?
-
- Most suppliers of chemicals will provide a MSDS on request if you are a
- customer. Several major chemical suppliers have combined their own MSDS
- sheets and issued major compilations, eg Sigma-Aldrich [1] ( available on
- CD-ROM or Magnetic Tape for $1,650), which may be available in the
- library. If a librarian can not locate the MSDS database, then try the
- Health and Safety Officer, who should know where to find MSDS. Larger
- organisations often purchase a compilation and make it available on a
- computer network for in-house use. The US Department of Defence CD-ROM
- of approximately 200,000 MSDS is available for approximately $100.
-
- 10.2 Where can I find hazard information for a chemical?
-
- Chemical suppliers usually include common hazard information in their
- catalogues. Merck and Hawley also list some information. Large compilations
- include Sax, Fire Protection Guide to Hazardous Materials [2],
- Sigma-Aldrich Library of Chemical Safety Data [3], CRC Handbook of
- Laboratory Safety [4], and Hazards in the Chemical Laboratory [5]. It is very
- important to realise that hazard information is frequently updated, and so
- information should be complemented with an online search of safety databases.
-
- If the chemical is already being used at your site, it is probable that the
- Safety Officer or Laboratory Manager already have the required information.
- The Handbook of Reactive Chemical Hazards [6], can be used to check for
- possible hazardous reactions. Highly toxic, radioactive, and carcinogenic
- compounds require special precautions, and the Safety Officer or Laboratory
- Manager should be able to provide the appropriate resources to ascertain if
- the compound can be handled safely.
-
- 10.3 Where can I find detailed safety & toxicity data?
-
- The very first question you should ask is, "Am I qualified to assess
- the data?". If the answer is no, then your best option is to locate somebody
- who is. This can be a Health and Safety Officer, staff of an appropriate
- government organisation (eg OSHA, NIOSH ), or a specialist consultant.
- Most institutions have a policy of ensuring workers are given sufficient
- information about hazards to ensure they can make an informed decision.
-
- There are several major compilations that are usually found in libraries,
- including RTECS, Sax, and the three-volume Sigma-Aldrich Library of
- Regulatory and Safety Data [7]. In general, because safety information can
- become obsolete rapidly, these should only be used as an introductory guide,
- and they should be complemented with either an on-line search or consultation
- with
- an expert. Detailed information for unusual chemicals is often difficult to
- locate in the published literature, and may only be available to qualified
- professionals in the health and safety fields. Sometimes the toxicity has to
- be inferred from published information on related compounds, and such
- assessments should always be performed by experts.
-
- 10.3 Where can I find occupational exposure limits?
-
- There are several organisations responsible for establishing the
- occupational exposure limits. The values used most extensively in industry,
- but also the most controversial, are those of the ACGIH. Their TLVs and
- Biological Exposure Indices [8] have been used in many countries as initial
- guidelines until relevant local expertise can assess their suitability.
- They are also misused, despite the clear warnings in the front of the
- booklet.
-
- The US Government also has Permissible Exposures Limits set by the Dept. of
- Labor Occupational Safety and Health Administration, and Recommended
- Exposure Limits set by the US National Institute for Occupational Safety and
- Health. The Deutsche Forschungsgemeinschaff Maximum Concentrations in the
- Workplace are often also used. The ACGIH publishes an excellent compilation
- of all these limits [9], thus facilitating a review of how experts perceive
- the occupational hazards. The International Labour Office in Geneva
- publishes a comprehensive " Encyclopedia of Occupational Health and Safety "
- which also covers chemicals [10].
-
- 10.5 What is the most poisonous compound?
-
- " All substances are poisons. There is not one that is not a poison. The
- correct dose differentiates a poison and a remedy". (Paracelsus 1493-1541)
-
- The McGraw Hill Encyclopedia of Science and Technology [11] lists the
- following table:
-
- "Approximate Median Lethal Doses of Some Toxins per kg of Bodyweight"
- Toxin Dose Test Animal
- tetanus 1 nanogram mouse, probably human
- botulinal neurotoxin 1 nanogram mouse, human
- shigella 1 nanogram monkey, human
- shigella 1 microgram mouse
- ricin 1 microgram human
- diphtheria 100 nanograms human
- diphtheria 1.6 milligrams mouse
-
- Ricin is a toxin lectin and hemagglutinin isolated from the castor bean.
- Merck reports the lethal dose in mice as 1 microgram of ricin D nitrogen
- (ip) per kg, and that ricin molecular weight is about 65,000. Ricin has
- been shown to contain four lectins, of which the RCL III (aka Ricin D )
- and RCL IV are the toxins. Merck also reports the following LD50 per kg
- of bodyweight:-
-
- Toxin Dose Test Animal
- palytoxin 60 nanograms dog (iv)
- ( from coral ) 450 " mouse (iv)
- ( C129H223N3054 ) 50-100 " " (ip)
- saxitoxin 3-5 micrograms mouse (iv)
- ( from shellfish ) 10 " " (ip)
- ( [C10H17N7O4]2+ ) 263 " " (oral).
- tetrodotoxin 10 " mouse (ip)
- ( from globefish )
- aflatoxin M1 332 micrograms duckling (oral)
- aflatoxin M2 1.2 milligrams " "
- aflatoxin B1 364 micrograms duckling (oral)
- aflatoxin B2 1.6 milligrams " "
- aflatoxin G1 784 micrograms " "
- aflatoxin G2 3.4 milligrams " "
-
- The complex structure of palytoxin is shown in Merck, and it is listed as
- the most toxic non-proteinaceous substance known.
-
- 10.6 Where can I find laboratory safety guides?
-
- The journals "Chemical Health and Safety", and "Journal of Chemical
- Education" have articles on many aspects of laboratory safety. Safety
- Officers and Laboratory Managers at educational institutions and companies
- are likely to have several guides, and a polite request should obtain a loan
- or copy of one, even if you aren't at that institution.
-
- There are several useful books. The most popular are:-
- CRC Handbook of Laboratory Safety [4]
- - good general discussion of laboratory safety issues.
- Hazards in the Chemical Laboratory [5]
- - good general discussion of laboratory safety concepts with data.
- Guidelines for Laboratory Design: Health and Safety Considerations [12].
- - modern design concepts for new and refurbished laboratories.
- Laboratory Health and Safety Handbook: A Guide for the Preparation of a
- Chemical Hygiene Plan [13]
- - such a plan is required by OSHA, and additional examples may also be
- available from chemistry departments of local educational institutes.
-
- 10.7 Are contact lenses a hazard in laboratories?
-
- There are a lot of myths about the occupational use of contact lenses, many
- of which relate back to a Bethlehem Steel welder in Baltimore who, on the
- 26 July 1967, accidentally caused an arc flash that hit his hard contact
- lens. He waited until the next day to report eyesight problems, and an
- ophthalmologist found severe ulcerations on his cornea, but attributed
- the damage to the wearing of the hard lenses for 17-18 hours after the
- incident. The cornea healed completely in a few days, with no permanent
- vision loss, and investigators found no link between the damage and the
- arc flash, but the myth of the welder removing parts of the cornea with
- the lens, and consequently being permanently blinded, continues [14].
-
- The banning of contact lenses from modern chemical laboratories is being
- reconsidered in the light of increasing evidence that case-by-case
- evaluations are more appropriate. Routine wearers of contact lenses may
- suffer " spectacle blur " when they switch to spectacles, and this temporary
- reduction in visual efficiency could result in the misreading of labels.
- Contact lenses are not eye protection devices, and OSHA believes that
- if eye hazards are present, appropriate eye protection must be worn
- instead of, or in conjunction with, contact lenses. There may still be some
- laboratory environments where the provided personal protection equipment
- does not protect wearers of contact lenses, and they will remain banned.
-
- There are three major areas of concern about the hazards of wearing
- contact lenses in chemical laboratories.
-
- 1. They can hold particulate or liquid material against the cornea.
- The modern soft contact lenses are considered suitable for most
- environments, except where heavily contaminated with metal particles.
- Hard contact lenses are not considered suitable for use in
- particle-contaminated areas.
-
- 2. Contact lenses can be difficult to remove after a chemical splash.
- This is a concern, and is one reason why wearers of contact lenses in
- laboratories should be obviously identifiable to first-aid and
- professional secondary care providers. The copious irrigation procedures
- with water ( whilst holding the eye open ) that should immediately follow
- chemical splashes may wash the lenses out, and trained staff can remove
- any remaining lenses later. Experiments with concentrated sodium
- hydroxide solution, sulfuric acid, acetic acid, acetone and n-butylamine
- have shown that contact lenses may actually provide some protection [14].
-
- 3. Contact lenses may absorb and retain chemical vapours.
- This effect was not observed in the splash experiments above, and soft
- lenses have been shown to reduce the effect of acids, perhaps because
- tears can dilute the acid by the time it passes through the lens.
- Some chemical vapours may be absorbed and retained, but often exposure
- should be eliminated by personal protection equipment anyway.
-
- The January/February 1995 issue of Chemical Health and Safety had three
- articles on contact lenses, including an excellent article on how to prepare
- for, and act during, contact lenses emergencies [15]. All three articles
- note that changing technologies have resulted in improved lenses that may
- now be acceptable in many modern laboratories, however the merits of each
- case should be carefully examined before approval. The issue of contact
- lenses in laboratories is still being carefully reviewed, as there are also
- legal implications for both employers and employees, and laboratory safety
- literature should be monitored to obtain the latest perceptions [16,17].
-
- ------------------------------
-