Abstract
The method involves the extraction of the detergent/tetrathiocyanatocobaltate(II) ion-pair into 4-methyl-2-pentanone. The overall concentration of cationic surfactant can be determined indirectly by measuring the cobalt in the organic layer by a.a.s. The optimum conditions for determining dodecyltrimethylammonium and tetraheptylammonium bromide (0.4–9.0 μg ml −1) are described. The relative standard deviation is 1.2%. The method is selective and free from the interference of nonionic surfactants, and is applied to the determination of cationic surfactants added to water samples.
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