Separation and preconcentration of Se(IV)/Se(VI) speciation on algae and determination by graphite furnace atomic absorption spectrometry in sediment and water |
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Authors: | Li Shunxin Qian Shahua Huang Ganquan and He Fei |
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Institution: | (1) Department of Environmental Sciences, Wuhan University, 430072, P. R. China,;(2) Department of Chemistry, Wuhan University, 430072, P. R. China, |
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Abstract: | A novel method for the separation and preconcentration of Se(IV)/ Se(VI) with algae and determination by graphite furnace
atomic absorption spectrometry (GFAAS) has been developed. The Se(VI) is extracted with algae from the solution containing
Se(IV)/Se(VI) at pH 5.0, and the remaining Se(IV) is then preconcentrated pH 1.0. The detection limits (3σ, n = 11) of 0.16 μg L–1 for Se(IV) and 0.14 μg L–1 for Se(VI) are obtained using 40 mL of solution. At the 2.0 μg L–1 level the relative standard deviation is 2.6% for Se(IV) and 2.3% for Se(VI). The method has been applied to the determination
of Se(IV)/Se(VI) in sediment and water samples. Analytical recoveries of Se(IV) and Se(VI) added to samples are ?97 ± 5% and
102 ± 6% (95% confidence), respectively.
Received: 10 February 1999 / Revised: 21 June 1999 / /Accepted: 22 June 1999 |
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