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Spectrophotometric determination of cationic surfactants by formation of ternary complexes with Fe(III) and chrome azurol
Author(s) -
Ming Song,
ShuQuan Liang
Publication year - 1996
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.19960140308
Subject(s) - chemistry , cetylpyridinium chloride , cationic polymerization , molar absorptivity , pulmonary surfactant , absorbance , bromide , aqueous solution , ternary complex , nuclear chemistry , ternary operation , extraction (chemistry) , spectrophotometry , inorganic chemistry , chromatography , organic chemistry , programming language , computer science , enzyme , biochemistry , physics , optics
An extraction‐free spectrophotometric method for the determination of cationic surfactants, such as cetylpyridinium chloride, cetyltrimethylammonium bromide and zephiramine is proposed, which is based on the formation of ternary complexes with Fe(III) and chrome azurol S. The molar ratio of the complex is 2:1:1 (Fe(III):chrome azurol S: cationic surfactant). The method is simple, rapid and sensitive, giving an apparent molar absorptivity of 4.5×10 4 L·mol −1 ‐cm −1 and a linear range of 0.1–6.0 μmol/L cationic surfactants. The total cationic surfactant content can be determined directly in aqueous solutions by measuring the absorbance at 680 nm (pH 5.8). The method has been successfully applied to water samples.