单模微波消解-ICP-MS法同时对大枣中19种元素的测定与分析研究

建立单模微波消解-电感耦合等离子体质谱法(ICP-MS)同时测定大枣中19种元素的方法。运用全自动单模微波消解仪对样品进行微波消解处理，通过对ICP-MS分析条件的选择及优化并上机测定，结果显示:Ag、As、Cr、Ni等12种元素标准曲线浓度范围在0～50 ng/mL之间,相关系数均大于0.995,表现出良好的线性关系；Al、Ba、Cu、Fe等7种元素标准曲线浓度范围在0～1000 ng/mL之间,相关系数均大于0.995,线性关系良好。对各浓度梯度元素分别1倍，2倍、10倍三水平加标回收试验，加标回收率在65%～110%之间，符合微量元素的定量分析要求。本研究所测方法操作简单方便、可靠,且具有较高的精密度和准确度,满足大枣中多元素的日常检测要求,同时为其质量控制及安全性评价提供方法技术支持。

Determination and Analysis of 19 Elements in Jujube by ICP-MS Method

A single-mode microwave digestion-inductively coupled plasma mass spectrometry (ICP-MS) method was established for the simultaneous determination of 19 elements in Jujube. The sample was processed with a full-automatic single-mode microwave digestion-digesting instrument. The ICP-MS analysis conditions were selected and optimized and tested by computer. The results showed that the standard curve concentration of Ag, As, Cr, Ni and other 12 elements ranged from 0 to 50 ng/mL, and the correlation coefficients were all greater than 0.995, showing a good linear relationship. The standard curve concentrations of Al, Ba, Cu, Fe and other 7 elements ranged from 0 to 1000 ng/mL, and the correlation coefficients were all greater than 0.995, showing a good linear relationship. The standard recovery test of each concentration gradient element was conducted at the three levels of 1-fold low-limit, 2-fold low-limit and 10-fold low-limit, and the standard recovery was between 65% and 110%, which met the requirements of quantitative analysis of trace elements. The test method in this study is simple, convenient, reliable, and has high precision and accuracy, which can meet the daily detection requirements of multiple elements in Jujube, and provide technical support for its quality control and safety evaluation.