Abstract
For routine control, glycerol is usually determined by oxidation of the sample with potassium dichromate in an excess of sulfuric acid with back titration of the excess dichromate solution after oxidation with ferrous sulfate solution. The usual procedure is to use potassium ferricyanide as an external indicator on a spot plate. The use of an electrometric titration apparatus with platinum and tungsten electrodes as an internal indicator is described. The apparatus is very easily constructed and gives rapid and accurate results with a sharp endpoint under all kinds of lighting conditions by any analyst who can read a buret—even by one who is color blind.
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Republished fromIndustrial and Engineering Chemistry, Vol. 9, Page 514, November 15, 1937, by special permission.
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Chemical Division, The Procter & Gamble Company. Electrometric titration of dichromate glycerol samples. Oil Soap 15, 36–38 (1938). https://doi.org/10.1007/BF02637005
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DOI: https://doi.org/10.1007/BF02637005