Assessment of Homogeneity and Minimum Sample Mass for Cadmium Analysis in Powdered Certified Reference Materials and Real Rice Samples by Solid Sampling Electrothermal Vaporization Atomic Fluorescence Spectrometry

文献类型： 外文期刊

第一作者： Mao, Xuefei

作者： Mao, Xuefei;Huang, Yatao;Zhang, Lihua;Tang, Xiaoyan;Zhou, Jian;Qian, Yongzhong;Wang, Min;Mao, Xuefei;Huang, Yatao;Zhang, Lihua;Tang, Xiaoyan;Zhou, Jian;Qian, Yongzhong;Wang, Min;Liu, Jixin;Feng, Li

作者机构：

关键词： cadmium;rice;minimum sample mass;solid sampling;electrothermal vaporization atomic fluorescence spectrometry (ETV-AFS)

期刊名称：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY （ 影响因子：5.279； 五年影响因子：5.269 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： To optimize analytical quality controls of solid sampling electrothermal vaporization atomic fluorescence spectrometry (SS-ETV-AFS), the homogeneity (H_E) of rice samples and their minimum sample mass (M) for cadmium analysis were evaluated using three certified reference materials (CRMs) and real rice samples. The effects of different grinding degrees (particle sizes <0.8S, <0.25, <0.15, and >1 mm) on H_E and M of real rice samples were also investigated. The calculated M values of three CRMs by the Pauwels equation were 2.19, 19.76, and 3.79 mg. The well-ground real rice samples (particle size <0.25 mm) demonstrated good homogeneity, and the M values were 3.48—4.27 mg. On the basis of these results, the Cd concentrations measured by the proposed method were compared with the results by microwave digestion graphite furnace atomic absorption spectrometry with a 0.5 g sample mass. There was no significant difference between these two methods, which meant that SS-ETV-AFS could be used to accurately detect Cd in rice with several milligrams of samples instead of the certified value (200 mg) or the recommended mass (200—500 mg) of the methods of the Association of Official Analytical Chemists.

分类号： R15

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