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5. A highly sensitive colour reaction for Se(IV) with the iodide-rhodamine B-PVA system Spectrophotometric determination of trace amounts of selenium in water

Author

Liu Shaopu, Huang Zhigui, and Zhou Guangming

Subjects
chemistry.chemical_classification, Vinyl alcohol, Trace Amounts, Iodide, Color reaction, Analytical chemistry, chemistry.chemical_element, Molar absorptivity, Analytical Chemistry, chemistry.chemical_compound, chemistry, Tap water, Rhodamine B, Selenium, Nuclear chemistry
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 × 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 μg/l. levels in tap water, hot-spring water and river water has been satisfactorily determined by the method.

Published
1988

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