Abstract
A method has been developed for the determination of cationic detergents in aqueous solution at concentrations of ca. 10 −5 M. The analysis depends upon the formation of a complex between the detergent and an anionic dye, and the quantitative extraction of the complex into an organic phase in which the dye itself is insoluble. The intensity of color in the organic phase is then directly proportional to the concentration of detergent. Satisfactory analyses have been achieved using octyltrimethylammonium bromide (±5%), dodecyltrimethylammonium bromide, cetyltrimethylammonium bromide, and dodecylpyridinium bromide (±2%). The method is insensitive to wide variations in pH and salt concentration of the detergent solution.
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