title: Bis[2-(2-pyridilazo)-5-diethylaminophenolato] cobalt(III) chloride as a new extraction and spectrophotometric reagent for trace anions Determination of sulphated and sulphonated surfactants.
abstract: The highly coloured bis[2-(2-pyridylazo-5-diethylaminophenolato] cobalt(III) ion, Co(PADAP)(+)(2), is proposed as a new counter-ion for use in the extraction and spectrophotometric determination of traces of colourless anions in water. Its application to the determination of sulphated and sulphonated surfactants is described. Beer's law is obeyed over a wide range and the detection limit is approximately 0.2 mug. Large amounts of diverse ions in common water samples do not interfere. The proposed method is simpler and more sensitive than the widely used 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: K
authors.initials: K
authors.lastname: Goto