期刊
ANALYTICA CHIMICA ACTA
卷 901, 期 -, 页码 34-40出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2015.10.020
关键词
UV photochemical vapor generation; As; One point gravimetric standard addition and internal standardization; Inductively coupled plasma mass spectrometry
资金
- National Natural Science Foundation of China [21205007, 21128006]
- China Scholarship Council [5044]
- Scientific Research Fund of Science and Technology department of Sichuan province [2014JY0155]
- Chengdu University of Technology [KYGG2014]
Photochemical vapor generation (PVG) sample introduction coupled to inductively coupled plasma mass spectrometry (ICPMS) is described for the determination of As in seawater. A Plackett-Burman design (PBD) and central composite design (CCD) were employed to evaluate the significance of experimental variables relevant to the optimization of PVG-ICPMS detection. The impact of the saline matrix on the suppression of analyte signal was eliminated by use of a mixture of 20% (v/v) formic and 20% acetic acid (v/v) as the photochemical reductants. Optimized conditions yielded equivalent PVG generation efficiencies for As(III), As(V), monomethylarsonic acids (MMAs) and dimethylarsinic acids (DMAs), permitting direct and rapid determination of total arsenic in seawater without any other sample pretreatment. Quantitation was accomplished using one point gravimetric standard addition along with a spike of Se-82 internal standard to compensate for signal drift and fluctuation during analysis. The resulting method detection limit of 3 pg g(-1) (3 sigma) provided a 15-fold improvement over that obtained using direct solution nebulization, and is comparable to that for conventional chemical hydride generation (HG)-ICPMS. Accuracy was demonstrated by analysis of two Certified Reference Materials (NASS-6 and CASS-5 seawater) with satisfying results characterized by precisions of 3.5% and 3.2% RSD for CASS-5 and NASS-6, respectively. Crown Copyright (C) 2015 Published by Elsevier B.V. All rights reserved.
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