A METHOD FOR THE SIMULTANEOUS DETERMINATION OF ARSENIC AND SULPHUR IN ORGANO-ARSENICALS

Abstract

During the course of the synthesis of aryl sulphonyl esters of hydroxy phenyl arsonic acids! a new and general method for simultaneous estimation of sulphur and arsenic in sulphur containing organo-arsenicals, by oxidation with alkaline permanganate. has been evolved. The analytical results obtained by the new method compare very well with those obtained by the application of previously known methods for arsenic and sulphur. Uptil now, separate estimations have to be made for sulphur and arsenic in a sulphur containing organo- arsenical compound necessitating larger quantities of sample and also involving longer period. When the reagents and apparatus are ready, a simultaneous determination of arsenic and sulphur by the new method can he completed within 8 hours. As long as necessary precautionary measures are taken, excess of potassium permanganate (even upto 109.) does not affect the accuracy of the result of arsenic estimation. The end point is usually very sharp.