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View Paper |
Session Topic: 3C, Chemical Metrology |
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Paper Title: Improvement in the Reliability and Comparability of pH and Electrolytic Conductivity Measurements |
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Date & Time: TUESDAY, August 6, 2002 |
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8:30 - 10:00am - PARALLEL SESSIONS - SESSION 3 |
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Speaker: Petra Spitzer
PTB |
Email: Petra.Spitzer@ptb.de |
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Electrolytic conductivity and pH are the among the most frequently measured parameters. To meet the requirements for quality control and other technical specifications a corresponding need exists for traceability in measurement results. To measure means to compare. Comparability entails recognised references to which the standard solutions used for the calibration of pH and conductivity meters can be traced back. The hierarchical approach to the traceability of pH and electrolytic conductivity measurements will be described. For analytical data to be internationally recognised, it is necessary to demonstrate the equivalence of the national traceability structures, including the national measurement standards. For the first time key comparisons for the quantity pH were carried out by the Consultative Committee for Amount of Substance (CCQM) to assess the degree of equivalence of the national measurement procedures used to determine the pH of primary standard buffer solutions. A report on the progress of these key comparisons and other international initiatives to improve the consistency of the results of measurement for pH and electrolytic conductivity will be given. |
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