2-Mercaptobenzoic acid as a reagent for the direct potentiometric titration of selenium(IV), tellurium(IV) and zinc(II)

Abstract

A simple, direct, rapid and accurate method for the potentiometric determination of selenium(IV), tellurium(IV) and zinc(II) with 2-mercaptobenzoic acid (thiosalicylic acid, TSA) is described. The determinations are also possible in the presence of several metal ions or acids with similar structures to TSA such as benzoic and salicylic acids. The equivalence point is marked by a sharp inflection or sharp peak in all instances and results with an average error of –0.01 to 0.18% were obtained.