Direct determination of cadmium in foods by solid sampling electrothermal vaporization inductively coupled plasma mass spectrometry using a tungsten coil trap

文献类型： 外文期刊

第一作者： Mao, Xuefei

作者： Mao, Xuefei;Wang, Min

作者机构：

关键词： Cadmium;Solid sampling;Tungsten coil trap;Electrothermal vaporization;Inductively coupled plasma mass spectrometry

期刊名称：SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY （ 影响因子：3.752； 五年影响因子：3.375 ）

ISSN： 0584-8547

年卷期： 2016 年 118 卷

页码：

收录情况： SCI

摘要： In this work, a solid sampling device consisting of a tungsten coil trap, porous carbon vaporizer and on-line ashing furnace of a Ni-Cr coil was interfaced with inductively coupled plasma mass spectrometry (ICP-MS). A modified double gas circuit system was employed that was composed of carrier and supplemental gas lines controlled by separate gas mass flow controllers. For Cd determination in food samples using the assembled solid sampling ICP-MS, the optimal ashing and vaporization conditions, flow rate of the argon-hydrogen (Ar/H-2) (v:v = 24:1) carrier gas and supplemental gas, and minimum sampling mass were investigated. Under the optimized conditions, the limit of quantification was 0.5 pg and the relative standard deviation was within a 10.0% error range (n = 10). Furthermore, the mean spiked recoveries for various food samples were 99.4%-105.9% (n = 6). The Cd concentrations measured by the proposed method were all within the certified values of the reference materials or were not significantly different (P > 0.05) from those of the microwave digestion ICP-MS method, demonstrating the good accuracy and precision of the solid sampling ICP-MS method for Cd determination in food samples. (C) 2016 Elsevier B.V. All rights reserved.

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