超级微波消解-电感耦合等离子体发射光谱/质谱法高效测定不同基质食品中27种矿物质元素

Determination of 27 elements in different food matrix by super microwave digestion coupled with inductively coupled plasma optical emission spectrometry/mass spectrometry

目的建立超级微波消解-电感耦合等离子体光谱法/电感耦合等离子体质谱法(inductively coupled plasma optical emission spectrometer/inductively coupled plasma mass spectrometry,ICP-OES/ICP-MS)检测10种基质食品样品的常见元素含量,分析和探究实验室中高通量快速准确检测方法。方法采用仅硝酸-水体系进行消解,ICP-MS测定重金属元素,ICP-OES测定营养元素。结果 ICP-MS测定结果表明各元素在质量浓度0~500μg/L范围内线性关系良好,相关系数为0.9997~1.0000,检出限均不高于1μg/L;ICP-OES测定结果表明各元素在质量浓度0~200 mg/L范围内线性关系良好,相关系数为0.9996~1.0000,检出限均不高于5 mg/L;标准物质验证结果均在范围内;加标实验回收率为88.1%~105.0%,相对标准偏差为0.05%~6.15%;与普通微波消解方法相比,该方法耗时缩短3/4。结论本方法准确简便、满足国标要求、适合高通量快速测定食品样品的元素含量,为科学迅速地评价食品中常见元素含量提供数据参考。

Objective To establish a method for the detection of common elements in ten kinds of food samples by super microwave digestion combined with inductively coupled plasma optical emission spectrometry/mass spectrometry（ICP-OES/ICP-MS）, and analyze and explore the high-throughput fast and accurate detection method in the laboratory. Methods Using nitric acid-water system for digestion, heavy metal elements were determined by ICP-MS, and nutrient elements were determined by ICP-OES. Results The results of ICP-MS determination showed that the mass concentration of each element had good linear relationships in the range of 0-500 μg/L, the correlation coefficients were 0.9997-1.0000, and the limits of detection were not higher than 1 μg/L. The results of ICP-OES determination showed that the mass concentration of each element had good linear relationships in the range of 0-200 mg/L, the correlation coefficients were 0.9996-1.0000, and the limits of detection were not higher than 5 mg/L. The test results of the standard material were all within the range. The recovery rates were 88.1%-105%, with the relative standard deviations of 0.05%-6.15%. Compared with ordinary microwave digestion method, the time consuming was only 0.25 times. Conclusion The method is accurate and simple, can meet the requirements of national standard, and is suitable for rapid determination of elements in food samples, which provides data reference for scientific and rapid evaluation of common elements in foods.