A titrimetric method for determining arsenite in presence of arsenate

Abstract

In presence of sodium hydrogen carbonate N-bromosuccinimide readily and quantitatively oxidises aqueous solutions of sodium arsenite to sodium arsenate. The reaction takes place at room temperature, and N-bromosuccinimide is irreversibly reduced to succinimide, with the formation of hydrogen bromide. The determination of sodium arsenite and arsenious oxide by titration with standard N-bromosuccinimide solution is described. The experimental error does not exceed f 2 per cent. Results are reported for comparative analyses of the same samples by the proposed method and by the generally accepted iodine method.SODIUM arsenite has been used in the treatment of sheep heIrninthiasis,lp2 and arsenites have proved to be effective insecticide^,^,^ e.g., sodium arsenitelime dust for Anabms simfiZex.6