Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 374, Issue 7-8, Pages 1341-1345Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-002-1591-5
Keywords
selenium; speciation; preconcentration; titanium dioxide; atomic absorption spectrometry
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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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