USP Electronic Research Repository

Trace determination and chemical speciation of selenium in environmental water samples using catalytic kinetic spectrophotometric method

Chand, Vimlesh and Prasad, Surendra (2009) Trace determination and chemical speciation of selenium in environmental water samples using catalytic kinetic spectrophotometric method. Journal of Hazardous Materials, 165 (1-3). pp. 780-788. ISSN 0304-3894

Full text not available from this repository.

Abstract

A catalytic kinetic method is described for the determination of Se(IV), Se(VI) and total inorganic selenium in water based on the catalytic effect of Se(IV) on the reduction of bromate by hydrazine dihydrochloride in acidic media. The generated bromine decolorized methyl orange (MO) and the reaction was monitored spectrophotometrically at 507 nm as a function of time. The initial rate and fixed time methods were adopted for the determination and speciation of inorganic selenium. Under two optimum conditions, the calibration graphs are linear in the range 0–126.3 and 0–789.6 μg L−1 of Se(IV) for the initial rate method and 0–315.8 and 0–789.6 μg L−1 of Se(IV) for the fixed time method. The detection limits were 1.3 and 14.7 μg L−1 for the initial rate and fixed time methods, respectively. The proposed methods were validated statistically and through recovery studies in environmental water samples. The relative standard deviation in the determination of 31.6–94.8 μg L−1 of Se(IV) and Se(VI) was less than 6%. Analyses of standard reference materials for selenium using initial rate and fixed time methods showed that the proposed methods have good accuracy. Se(IV), Se(VI) and total inorganic selenium in environmental water samples have been successfully determined by this method after selective reduction of Se(VI) to Se(IV).

Item Type: Journal Article
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Science, Technology and Environment (FSTE) > School of Biological and Chemical Sciences
Depositing User: Ms Neha Harakh
Date Deposited: 24 Nov 2009 13:27
Last Modified: 13 Feb 2012 12:49
URI: http://repository.usp.ac.fj/id/eprint/1457
UNSPECIFIED

Actions (login required)

View Item