Screening of nutritional and toxic elements in plant-based foods is very important for human health. A reliable solid sampling inductively coupled plasma-mass spectrometry (ICP-MS) method based on the direct introduction of food particle slurries for the simultaneous determination of 16 elements (K, Ca, Mg, Fe, Sr, Zn, Cu, As, Pb, Cr, V, Li, Ti, Rb, Ge, and Ba) was developed. Sample powders were dispersed in 0.5% polyethylene imine by wet-grinding with a tissue cell-destroyer, and 90% of the particles in the slurry were found to be less than 0.8 μm in diameter during the 90 s milling. The feasibility of using direct calibration with simple aqueous standards in slurry nebulization ICP-MS analysis was evaluated by studying the transportation and ionization behavior of particles with different sizes. The upper limits of particle sizes for the efficient transportation and complete ionization were 8.5 μm and 3–4 μm, respectively. In addition, an extended dynamic range technique was developed to simultaneously analyze the major and trace elements in one analysis. Satisfactory recovery (93–106%) and precision (0.3–8.6%, RSD, n = 3) were verified by analyzing a series of food certified reference materials.

中文翻译：

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浆液雾化ICP-MS对植物性食品进行元素筛选

筛选植物性食品中的营养和有毒元素对人类健康非常重要。基于直接引入食品颗粒浆料的可靠的固体采样电感耦合等离子体质谱法（ICP-MS），用于同时测定16种元素（K，Ca，Mg，Fe，Sr，Zn，Cu，As，Pb ，Cr，V，Li，Ti，Rb，Ge和Ba）被开发出来。通过用组织细胞破坏器进行湿研磨将样品粉末分散在0.5％的聚乙烯亚胺中，发现在90 s的研磨过程中，浆液中90％的颗粒直径小于0.8μm。通过研究不同尺寸颗粒的传输和电离行为，评估了在浆料雾化ICP-MS分析中使用简单水标样直接校准的可行性。有效运输和完全电离的粒径上限分别为8.5μm和3-4μm。此外，开发了一种扩展的动态范围技术，可以在一次分析中同时分析主要元素和痕量元素。恢复令人满意（93–106％）和精度（0.3–8.6％，RSD，n = 3）通过分析一系列食品认证参考材料进行验证。