FIELD: amperometric analysis. SUBSTANCE: analysis of chromium(VI) and reducing agents for neutralization thereof (e.g. ferrous salts, sulfite, bisulfite, and pyrosulfite) is conducted in potentiostatic mode at measuring electrode potential ranged from +450 to +850 mV against saturated silver chloride electrode using, as supporting solution, solutions of strong mineral acids. Acid concentration in aqueous solution after addition of supporting solution should be at least 0.45 g-eq/l with Cr(VI) concentration from 100 to 100 mg/l. At Cr(VI) concentration from 0 to 100 mg/l, acid concentration should obey the following condition: C≥m + kCwhere Cis concentration of acid in the sample to be analyzed (g-eq/l), m = 0.2 g-eq/l is a constant, k = 2.5 x 10 g-eq/mg is a coefficient, and Cis maximum possible concentration of Cr(VI) in water being analyzed (mg/l). Selection of a particular potential of measuring electrode is determined by process requirements for analysis, and its stability in regard to reference electro
