期刊
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
卷 65, 期 12, 页码 1002-1007出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.sab.2010.10.002
关键词
Selenium; TXRF; Environmental solutions; Limits of detection; Matrix effects
类别
资金
- European Commission [MRTN-CT-2006-035420]
- Spanish Consolider Ingenio 2010 Research Initiative [CSD2006-00044]
- Spanish National Research Programme [CGL2007-66861-C4]
- Spanish Council for Scientific Research (CSIC)
A significant amount of environmental studies related to selenium determination in different environmental compartments have been published in the last years due to the narrow range between the Se nutritious requirement as essential element and toxic effects upon exposure. However, the direct analysis of complex liquid samples like natural waters and extraction solutions presents significant problems related to the low Se concentrations and the complicated matrix of this type of samples. The goal of the present research was to study the applicability of direct TXRF analysis of different type of solutions commonly used in environmental and geochemical studies, confirm the absence or presence of matrix effects and evaluate the limits of detection and accuracy for Se determination in the different matrices. Good analytical results were obtained for the direct analysis of ground and rain water samples with limits of detection for Se two orders of magnitude lower than the permissible Se concentration in drinking waters ([Se] = 10 mu g/L) according to the WHO. However, the Se detection limits for more complex liquid samples such as thermal waters and extraction solutions were in the mu g/L range due to the presence of high contents of other elements present in the matrix (i.e., Br, Fe, Zn) or the high background of the TXRF spectrum that hamper the Se determination at trace levels. Our results give insight into the possibilities and drawbacks of direct TXRF analysis and to a certain extent the potential applications in the environmental and geochemical field. (C) 2010 Elsevier B.V. All rights reserved.
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