Abstract
Two new reagents, C 6H 5SeO 2NH 4 and C 10H 7SeO 2NH 4, are suggested for the gravimetric determination of bismuth. With bismuth the reagents form white crystalline precipitates, Bi(C 6H 50SeO 2) 3 and Bi(C 10H 7SeO 2) 3, in mineral acid solutions. The bismuth is determined by weighing the precipitates after drying at 110–120°. The titrimetric determination of bismuth is possible by solution of Bi(C 6H 5SeO 2) 3 in a mixture of mineral and tartaric acids and iodometric titration of C 6H 5SeO 2H by a potentiometric or amperometric method. The relative error of the determination of 5 to 20 mg of bismuth does not exceed 0.5%.
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