title: An application of bis[2-(5-chloro-2-pyridylazo)- 5-diethylaminophenolato]cobalt(III) chloride to the extraction and spectrophotometric determination of sulphonated and sulphated surfactants.
abstract: Bis[2-(5-chloro-2-pyridylazo)-5-diethylaminophenolato]cobalt(III) is proposed for the extraction and spectrophotometric determination of sulphated and sulphonated surfactants. The complex and the surfactants form ion-pairs which are extracted into benzene from O.1M hydrochloric acid. The absorbance of the benzene phase is measured at 560 nm against a reagent blank. Less than 25 mug of sodium di-(2-ethylhexyl) sulphosuccinate in 50-200 ml of sample solution is determined reproducibly by the proposed method. When applied to river water samples, the proposed method gives results which agree very well with those obtained by the standard Methylene Blue method. However, the proposed method is simpler and more sensitive than the Methylene Blue method.
authors.affiliation: Department of Chemistry Faculty of Science Toyama University Toyama 930 Japan.
authors.forename: S
authors.initials: S
authors.lastname: Taguchi
authors.forename: I
authors.initials: I
authors.lastname: Kasahara
authors.forename: Y
authors.initials: Y
authors.lastname: Fukushima
authors.forename: K
authors.initials: K
authors.lastname: Goto