Shaopu L, Guangming Z, Zhigui H
Chemistry Department, Southwest Normal University, Chongqing, People's Republic of China.
Talanta. 1990 Jul;37(7):749-52. doi: 10.1016/0039-9140(90)80106-p.
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.
