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

Content Provider	Royal Society of Chemistry (RSC)
Author	Silva, Laiana O. B. Palacio, Edwin Ferreira, Sergio L. C. Ferrer, Laura Cerdà, Víctor Portugal, Lindomar A.
Copyright Year	2014
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.
Starting Page	2398
Ending Page	2404
Page Count	7
File Format	HTM / HTML PDF
ISSN	02679477
Volume Number	29
Issue Number	12
Journal	Journal of Analytical Atomic Spectrometry
DOI	10.1039/c4ja00305e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	National Research Council of Canada Mallorca Spain Flow injection analysis Absorption spectroscopy Mathematical optimization Thiourea Cysteine Coefficient of variation Cadmium National Scientific and Technical Research Council Canada Majorca
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Analytical Chemistry

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