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Issue 8, 2006
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Determination of antimony by atomic absorption spectrometry with flow injection hydride generation by a tetrahydroborate-form anion-exchanger

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Abstract

A quartz tube atomic absorption spectrometric method for the determination of antimony by FI-HG was developed in which stibine (SbH3) was generated from the reaction between antimony in the injected solution and tetrahydroborate immobilized on a strong anion-exchange resin (Amberlite IRA-400). Several samples could be injected before the column was reloaded. The LOD (3s) in 4 mol l−1 HCl and 10% cysteine, and 4 mol l−1 HCl and 10% thiourea, were 0.55 and 0.54 μg l−1, respectively. The precision, expressed as %RSD (n = 5), was 5.9, 4.9, 3.8, 2.6 and 1.0 for 5.0, 10.0, 20.0, 40.0 and 60.0 μg l−1, respectively, in 4 mol l−1 HCl and 10% (m/v) L-cysteine; and 8.1, 5.0, 1.5, 1.2 and 1.4 for the same concentrations in 4 mol l−1 HCl and 10% (m/v) thiourea. The throughput was 60 h−1. Interferences from transition metals and hydride-forming elements, and signal suppression due to high ionic strength, were eliminated by the addition L-cysteine or thiourea to the samples, which also allowed the acid concentration to be decreased to 0.61 mol l−1. The method was evaluated by the analysis of spiked sea and well waters, for which no matrix effects were observed: the recoveries for 3.0 and 5.0 μg l−1 were 102% and 110–114%, respectively.

Graphical abstract: Determination of antimony by atomic absorption spectrometry with flow injection hydride generation by a tetrahydroborate-form anion-exchanger

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Article information


Submitted
20 Dec 2005
Accepted
31 May 2006
First published
16 Jun 2006

J. Anal. At. Spectrom., 2006,21, 757-762
Article type
Paper

Determination of antimony by atomic absorption spectrometry with flow injection hydride generation by a tetrahydroborate-form anion-exchanger

Y. Rodriguez and J. F. Tyson, J. Anal. At. Spectrom., 2006, 21, 757
DOI: 10.1039/B518042B

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