La Détermination Ampérométrique de L'Arsénite Par L'Hypobromite

Abstract

The direct determination of arsenites with hypobromite by amperometric titration in alcaline medium is studied. Although the total normality of the hypobromite solution is constant when determined by the iodometric method in acid medium, a difference occurs by amperometric determination in bicarbonate or sodium hydroxide medium, which depends also on the titration rate.The presence of two compounds is established : hypobromite with constant normality, reacting instantly and bromite with changing normality due to the slow reaction rate.