Polarographic determination of salicylic acid.

Polarographic study of chloranil and its related compounds. III.

Abstract

The author had revealed in the preceding study that chloranil was determined satisfactorily by the polarography in 50% alcohol solution at pH 3.4 using N/10 potassium nitrate as a supporting electrolyte. The principle was applied for the determination of salicylic acid which can be oxidized quantitatively to chloranil.
The author recommended a method in which the chloranil derived from salicylic acid by potassium chlorate-hydrochloric acid oxidation was extracted with ether and was determined by the polarographic method. This offers an easy and accurate means for the determination of salicylic acid.
The method was applied practically to the determination of salicylic acid in 4% acetic acid solution (vinegar).