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Issue 12, 2005
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Use of lanthanum hydroxide as a trapping agent to determine of hydrides by HG-ICP-OES

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Abstract

The level of arsenic and antimony was determined in sea-water by axial ICP-OES with continuous hydride generation after performing pre-reduction with thiourea and carrying out a pre-concentration by co-precipitation with lanthanum in a PTFE knotted reactor (KR). Optimisation of the whole system was performed using experimental design and with on-line pre-concentration and ultimate hydride generation. Using a pre-concentration time of two minutes and consuming 16 mL of sample, the LOD and LOQ were 0.17 and 0.56 μg L−1, respectively, for As, and 0.27 and 0.88 μg L−1 for Sb. Pre-concentration was carried out off-line in the KR in order to decrease the LOD and LOQ to 0.031 and 0.10 μg L−1 (As 188.979 nm) and 0.043 and 0.15 μg L−1 (Sb 217.582 nm) (sample volume 83 mL). The method was precise, with RSDs (n = 11) of 5.7% for As and 9.4% for Sb. The method was accurate, with a recovery of 108.5% for As and 106.0% for Sb. Moreover, values of 3.0 ± 0.5 μg As L−1 and 14.7 ± 1.5 μg Sb L−1 were obtained for a reference material with certified content of 2.7 ± 1.0 μg As L−1 and 13.7 ± 8.5 μg Sb L−1. The method can be applied to element determination in unpolluted sea-water samples.

Graphical abstract: Use of lanthanum hydroxide as a trapping agent to determine of hydrides by HG-ICP-OES

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Article information


Submitted
08 Jul 2005
Accepted
13 Sep 2005
First published
05 Oct 2005

J. Anal. At. Spectrom., 2005,20, 1344-1349
Article type
Paper

Use of lanthanum hydroxide as a trapping agent to determine of hydrides by HG-ICP-OES

E. Peña-Vázquez, A. Bermejo-Barrera and P. Bermejo-Barrera, J. Anal. At. Spectrom., 2005, 20, 1344
DOI: 10.1039/B509718E

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