title: Extractive spectrophotometric determination of non-ionic surfactants in water.
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(2)CH(2)O)(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.
authors.affiliation: Department of Chemistry, Faculty of Science, Okayama University, Tsushima-naka 3-1-1, Okayama 700, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Tôei
authors.forename: S
authors.initials: S
authors.lastname: Motomizu
authors.forename: T
authors.initials: T
authors.lastname: Umano