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By the way, my apologies for not adding the necessary and intended smiley in my first sentence above. Of course you couldn't actually follow my link, which I didn't put into the text correctly.
Yes, my reference was to the Weiss Research link, but you can also see the second link, from Cole-Parmer.
Both links reveal that Light's Solution is used as an "oxidation-reduction potential standard". So you don't know what this means? Then you should continue reading and researching to get more information.
In particular, the fifth link on the very same Google search says (I've stripped out the nasty Google redirect):
Calibration method using a stable and safe redox standard solution ...Light's Solution is not light-sensitive and is generally more stable than Zobell's Solution, but Light's Solution is so strongly acidic (pH about 0.3) that ...www.patentstorm.us/patents/6350367/description.html - Cached - Similar
The first two paragraphs (under "BACKGROUND") give you an excellent summary of what a "redox standard" is, and why it is used. If you don't know what some of the terms in those paragraphs mean, you might cut and paste them into, for example, Wikipedia.
You could also have typed ORP into Wikipedia's search box, and the very first bullet would take you to "oxidation reduction potential," which you can follow and read to learn more.
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Posted:Feb 6, 2011
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