NetNews Usenet Archive 1992 #16/NN_1992_16.iso/spool/sci/physics/fusion/1841

Text File | 1992-07-27 | 1.8 KB | 38 lines

Newsgroups: sci.physics.fusion
Path: sparky!uunet!munnari.oz.au!metro!seagoon.newcastle.edu.au!cc.newcastle.edu.au!medb
From: [e-mail] (Dieter Britz)
Subject: Re: Measuring D2O2 in LiOD electrolytes
Message-ID: <[e-mail]>
Lines: 26
Sender: [e-mail]
Organization: University of Newcastle, AUSTRALIA
References: <[e-mail]>
Date: Mon, 27 Jul 1992 11:46:45 GMT

In article <[e-mail]>, [e-mail] (Bruce Dunn)
writes:
> Measurement of D2O2 in saturated LiOD solutions
...
> Using 50 microliters of color reagent, 50 microliters of saturated LiOH, and 50
> microliters of peroxide or water, I found that 10E-1 molar and 10E-2 molar
> peroxide produced an almost instantaneous dark blue-black color.  10E-3 molar
> peroxide produced a dark blue color, but took a couple of minutes.  10E-4 molar
> peroxide over several minutes produced a yellow-brown color, clearly
> distinguishable from the colorless solution produced by substituting water for
> the peroxide.  10E-5 molar peroxide or water gave no visible color.
>         I leave it to others to do the appropriate calculations to calculate
> whether the detection limit of 10E-4 molar is adequate to rule out peroxide
> effects in cells.  If not, I would be prepared to further fine tune the assay,
> probably using larger volumes and spectrophotometry at 360 nm.

Good on you, Bruce. I suppose Tom really ought to get a syringe, take out a
wee drap of his electrolyte and try this. However, as to sensitivity: no need
to go to ultra-low concentrations, because D2O2 came in as a suspect gas
swallower or excess heat producer, so it would have to be in excess of, say,
0.01 M to even register in Tom's data as a disturbance.
 I still say forget peroxide.

Dieter alias [e-mail]
-------------------------------------