Abstract
Determination of traces of anionic and non-ionic surfactants in water has been based on the quantitative separation of sodium alkylbenzene sulphonate (LAS) from polyoxyethylenealkylphenyl ether (APE) with a weak base anion-exchange resin, and adsorption of APE in filtrate with Amberlite XAD-2 resin. LAS is adsorbed on the anionexchange resin, eluted with hydrochloric acid-methanol and determined spectrophotometrically by methylene blue or UV absorption. APE in the filtrate is adsorbed on XAD-2 resin, eluted with methanol and determined spectrophotometrically by cobalt thiocyanate or UV absorption. Recoveries of surfactants were about 90∼100%. As little as 0.02 ppm can be determined. In a river water sample 0.06 ppm of LAS and 0.05 ppm of APE and in another case, 0.12 ppm of LAS and 0.07 ppm of APE were found.
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