Coulometric determination of microamount of boron by the photometric end point detection

Abstract

The coulometric titration method for the determination of microamounts of boron by using mannitol was investigated by means of photometric end-point detection. As an indicator, methyl red was the most satisfactory, and 1 to 50 gamma of boron were determined accurately by the proposed method. The method was applied for the determination of boron in steel. The separation of boron from a large amount of iron was effected by the methyl borate distillation method, and boron in steel could be determined with satisfactory results. (auth)