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Issue 12, 2014
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Multi-commuted flow system for cadmium determination in natural water by cold vapour atomic absorption spectrometry

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Abstract

The present paper proposes the use of a multi-syringe flow injection analysis (MSFIA) system for the determination of Cd in natural water by cold vapour atomic absorption spectrometry (CV-AAS). The chemical and physical conditions for vapour generation were investigated and optimized using multivariate optimization methodology. Some complexing reagents were tested as additives to increase the analytical signal. Thiourea showed a positive effect, whereas L-cysteine reduced the signal of Cd. The method allows the direct determination of Cd, i.e. without sample pre-concentration, with limits of detection and quantification of 5.8 and 19.3 ng L−1, respectively, and employing external calibration technique. The precision expressed as a relative standard deviation varied between 1.4% and 2.9% for two levels of cadmium (0.25 and 2.5 μg L−1). Using 2 mL of sample volume, an injection throughput of 87 h−1 was achieved. The accuracy was confirmed by the analysis of a certified reference sample of seawater (CASS-4) furnished by National Research Council of Canada and addition/recovery tests, obtaining recoveries between 94% and 101%. The method was satisfactorily applied for the determination of Cd in seawater and ground water samples from Mallorca, Spain.

Graphical abstract: Multi-commuted flow system for cadmium determination in natural water by cold vapour atomic absorption spectrometry

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Article information


Submitted
12 Sep 2014
Accepted
08 Oct 2014
First published
08 Oct 2014

J. Anal. At. Spectrom., 2014,29, 2398-2404
Article type
Paper
Author version available

Multi-commuted flow system for cadmium determination in natural water by cold vapour atomic absorption spectrometry

L. O. B. Silva, L. A. Portugal, E. Palacio, L. Ferrer, V. Cerdà and S. L. C. Ferreira, J. Anal. At. Spectrom., 2014, 29, 2398
DOI: 10.1039/C4JA00305E

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