Oxidimetry

Oxidimetry 

a group of methods in quantitative chemical analysis that make use of oxidation-reduction reactions. Modern oxidimetric procedures are characterized by the standard chemical solution that they use, for example, iodometry, which uses iodine or sodium thiosulfate, and titrations with potassium permanganate, potassium dichromate, potassium bromate, titanium (III) chloride, titanium (III) sulfate, or cerium (IV) sulfate. Oxidimetry generally employs specific chemical indicators to determine the equivalence point, or end point, in titration, for example, starch in iodometry, diphenylamine in titration with potassium chromate, and ferroin in titration with cerium (IV) sulfate.

Potentiometric techniques for determining the equivalence point have considerably broadened the possibilities for oxidimetric analysis. A steady increase has been observed in the number of oxidimetric methods available in recent years as a result of the introduction of new reagents, such as potassium hexacyanoferrate, ascorbic acid, lead (IV) acetate, and hypohalogens. Oxidimetry is widely used in the analysis of inorganic and organic substances and is the most commonly used titrimetric method.

REFERENCES

Kreshkov, A. P. Osnovy analiticheskoi khimii, 3rd ed., [book] 2. Moscow, 1971.
Zakhar’evskii, M. S. Oksredmetriia. Leningrad, 1967.

IU. A. KLIACHKO