title: A highly sensitive colour reaction for Se(IV) with the iodide-rhodamine B-PVA system Spectrophotometric determination of trace amounts of selenium in water.
abstract: A highly sensitive spectrophotometric method for determination of selenium(IV) has been developed, based on Se(IV) oxidation of I(-) to I(-)(3) in a weak-acid medium, then formation of the 1:1 ion-association complex of I(-)(3) with Rhodamine B in the presence of poly(vinyl alcohol). The molar absorptivity is 1.97 x 10(5)l.mole(-1).cm(-1). Preconcentration of Se(IV) and elimination of interfering ions is achieved by an improved thiol cotton method, so the determination has very good selectivity. Se(IV) at mug/l. levels in tap water, hot-spring water and river water has been satisfactorily determined by the method.
authors.affiliation: Chemistry Department, Southwest Normal University, Chongqing, People's Republic of China.
authors.forename: L
authors.initials: L
authors.lastname: Shaopu
authors.forename: Z
authors.initials: Z
authors.lastname: Guangming
authors.forename: H
authors.initials: H
authors.lastname: Zhigui