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目的:建立同时测定干豆中微量元素的电感耦合等离子体质谱分析法。方法:采用压力罐消解技术,电感耦合等离子体质谱法(ICP-MS)分别测定黄豆、红豆、黑豆、绿豆、眉豆中Cr、Mn、Fe、Ni、Cu、Zn、As、Se、Mo、Cd、Ba、Pb元素含量。结果:所测定的12种微量元素标准曲线线性回归方程相关系数均大于0.999,各元素相对标准偏差(RSD)均小于5.0%(n=6),加标回收率为87.0%～110.0%,方法检出限为0.000075μg/g～0.0058μg/g,并用生物标准参考物质黄豆(GBWl0013)评价分析方法的准确度,测定结果与推荐值相符。干豆中Fe、Zn、Mn含量较高;其次是Cu、Ni、Ba,而绿豆中Mo含量相对比另外4种豆类要高。结论:此方法准确、快速,适用于豆类等农作物中微量元素的测定。
Objective: To establish an inductively coupled plasma mass spectrometry method for the simultaneous determination of trace elements in dried beans. Methods: The contents of Cr, Mn, Fe, Ni, Cu, Zn, As, Se and Mo in soybean, red bean, black bean, mung bean and black soybean were determined by pressure tank digestion and inductively coupled plasma mass spectrometry (ICP- Cd, Ba, Pb element content. Results: The correlation coefficients of the 12 standard curves of trace elements were all greater than 0.999, and the relative standard deviations (RSDs) of all the elements were less than 5.0% (n = 6). The recoveries were 87.0% ~ 110.0% The detection limit was 0.000075μg / g ~ 0.0058μg / g, and the accuracy of the analytical method was evaluated by using the biological standard reference material soybean (GBW10013). The measured results are in accordance with the recommended values. The contents of Fe, Zn and Mn in dried beans were higher, followed by Cu, Ni and Ba, while the content of Mo in mung beans was higher than the other four kinds of legumes. Conclusion: This method is accurate and rapid and suitable for the determination of trace elements in crops such as legumes.