Section 36
Chapter 35,713

Separation and preconcentration of Se /Se species by selective adsorption onto nanometer-sized titanium dioxide and determination by graphite furnace atomic absorption spectrometry

Li, S.; Deng, N.

Analytical and Bioanalytical Chemistry 374(7-8): 1341-1345


ISSN/ISBN: 1618-2642
Accession: 035712885

A simple and sensitive method for the selective determination of Se(IV) and Se(VI) in natural water and sludge samples through an adsorptive process on a nanometer-sized TiO2 (anatase) was developed. The conditions for quantitative and reproducible preconcentration, elution, and subsequent GFAAS determination were established. The proposed method gave a concentration factor of 50 for a 100 mL sample volume, characterized by high precision, high reproducibility, and direct determination of Se(IV)/Se(VI). The detection limits (3sigma, n=11) were 4.7 ng L-1 for Se(IV) and 6.3 ng L-1 for Se (VI); the precision (relative standard deviation) was 0.7% for Se (IV) and 0.9% for Se (VI) at the 0.5 mug L-1 level.

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