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Extractive spectrophotometric determination of non-ionic surfactants in water

Authors
Journal
Talanta
0039-9140
Publisher
Elsevier
Publication Date
Volume
29
Issue
2
Identifiers
DOI: 10.1016/0039-9140(82)80028-3

Abstract

Abstract The solvent extraction of non-ionic surfactants with potassium chloride and tetrabromophenolphthalein ethyl ester potassium salt has been studied, and a method developed for determining trace amounts of non-ionic surfactants in water spectrophotometrically. Various non-ionic surfactants of general type RO(CH 2CH 2O) n H (where R is an alkyl or alkylphenyl group and n is the number-average degree of polymerization) are extracted quantitatively into o-dichlorobenzene from the water sample, and reacted in the organic phase with tetrabromophenolphthalein ethyl ester potassium salt to give a coloured product, the absorbance of which is measured at 620 nm.

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