Ammonium pyrrolidinedithiocarbamate-modified activated carbon micro-column extraction for the determination of As(III) in water by graphite furnace atomic absorption spectrometry |
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Authors: | Yinyan Jiang Yiwei Wu Jungfeng Liu Xinquan Xia Danlei Wang |
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Institution: | (1) Hubei Key Laboratory of Bioanalytical Technique, Department of Chemistry and Environmental Engineering, Hubei Normal University, Huangshi, P.R. China;(2) Department of Clinical Laboratory, The Second Hospital of Huangshi, Huangshi, P.R. China |
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Abstract: | A simple and selective method using ammonium pyrrolidinedithiocarbamate modified activated carbon (APDC-AC) as solid phase
extractant has been developed for speciation of As(III) in water samples. At pH 1.8–3.0, As(III) could be adsorbed quantitatively
by APDC-AC, and then eluted completely with 2.0 mL of 0.1 mol L−1 HNO3, while As(V) could almost not be retained at pH 1–7. Effects of acidity, sample flow rate, concentration of elution solution
and interfering ions on the recovery of As(III) have been systematically investigated. Under the optimal conditions, the adsorption
capacity of APDC-AC for As(III) is 7.3 mg g−1. The detection limit (3σ) of As(III) is 0.05 ng mL−1 for graphite furnace atomic absorption spectrometry (GFAAS) with enrichment factor of 50, and the relative standard deviation
(RSD) is 4.1% (n = 9, C = 5 ng mL−1). The method has been applied to the determination of trace As(III) in water, and the recoveries of As(III) are 100 ± 10%.
Correspondence: Yiwei Wu, Department of Chemistry and Environmental Engineering, Hubei Normal University, Huangshi 435002,
P.R. China |
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Keywords: | : Ammonium pyrrolidinedithio-carbamate modified activated carbon As(III) graphite furnace atomic absorption spectrometry preconcentration and separation |
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