Abstract
An automated colourimetric procedure using ammonium cobaltothiocyanate as the colour-producing reagent was shown to be suitable for the determination of non-ionic surfactants in water. The complex formed by this reagent and non-ionic surfactants is extracted into chloroform and its concentration is measured absorptiometrically at 620 nm. Samples were analysed at a rate of 3 h −1 by a modified AutoAnalyzer system. The limit of detection was approximately 0.5 mg l −1, and the standard deviation at the 10 mg l −1 level was 0.2 mg l −1. The technique has limitations but forms a basis for further investigation.
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