Studies on Invert Soaps. II. Colorimetric Determination of Benzalkonium Chloride using Phosphomolybdic Acid

Abstract

A new assay method of benzalkonium chloride was established, and it can be carried out rapidly and accurately. Its principle is to measure the intensity of a blue color that is developed by adding a stannous chloride solution to a solution of the combined substance made from benzalkonium chloride and phosphomolybdic acid.