Amperometric Determinations of Metals with Chloramine T

概要

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An indirect procedure for the determination of V5+, Ce4+ and Cr6+ is given. Three re-ductants, viz., ascorbic acid, arsenous oxide and hydrazine have been employed for reduction of each oxidant. Iodine monochloride has been used as catalyst in the reduction of V5+ and Ce4+ by arsenous oxide. Reduction of Ce4+ with hydrazine presented certain difficulties and is not pursued at the present stage. The excess reductant in each case is determined amperometrically with chloramine T at the rotating platinum wire micro-electrode, and an impressed potential of +0.3 volt vs. S.C.E. The titrations are performed at a pH of 4.3∼4.9, using citrate-citric acid buffer. For titration of excess arsenous oxide and N2H4·H2SO4, 0.25 ml. of iodine monochloride (0.005 M) has been employed as catalyst. The procedure, which is rapid and accurate, has been employed for determination of amounts up to 1.05 mg. vanadium, 5 mg. cerium and 0.86 mg. chromium.
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