Direct Determination of Ultratrace Cadmium in Spinach by Electrothermal Vaporization Atomic Fluorescence Spectrometry Using On-line Atom Trap of Tungsten Coil

文献类型： 外文期刊

第一作者： Huang Ya-Tao

作者： Huang Ya-Tao;Mao Xue-Fei;Wang Min;Zhang Li-Hua;Tang Xiao-Yan;Zhou Jian;Liu Ji-Xin;Feng Li

作者机构：

关键词： Solid sampling;Electrothermal vaporization;On-line atomic trap of tungsten coil;Atomic luorescence spectrometry;Spinach;Cadmium

期刊名称：CHINESE JOURNAL OF ANALYTICAL CHEMISTRY （ 影响因子：1.134； 五年影响因子：0.909 ）

ISSN： 0253-3820

年卷期： 2013 年 41 卷 10 期

页码：

收录情况： SCI

摘要： A novel solid sampling method of detecting cadmium in spinach by electrothermal vaporization atomic fluorescence spectrometer (SS-ETV-AFS) was established, which made use of a tungsten-coil as a Cd trap at room temperature to remove matrix interferences and foam graphite as a electrothermal vaporizer and a sample boat. In our wok, it was proven that the foam graphite vaporizer had a stable performance and different sample boats had no difference for testing; there was good homogeneity and representativeness for fresh spinach sample grinded with liquid nitrogen, 16. 3mg was calculated by the Pauwels equation as the minimum sample mass which satisfied microsampling of SS-ETV-AFS. After optimization, the ashing (50 W for 50 s then 70 W for 80 s) and evaporating (70 W for 30 s) procedures were separated, and 600 mL/min Ar/H2 (9:1, V/V) was chosen as the carrier gas. Under the optimized conditions, the limit of detection was 0. 2 mu g/kg; the recovery was 90. 1% - 106. 1%, the relative standard deviation was less than 10%, and the analysis time was within 5 min. There was no interference from the other elements and organic matrix, and there was no significant difference (p > 0. 05) between the methods of SS-ETV-AFS and microwave digestion graphite furnace atomic absorption spectrometer.

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