微波消解-ICP-MS法测定食品、水产品及 动物组织中33种金属元素

Determination of 33 kinds of metallic elements in food aquatic products and animal tissues by microwave digestion and ICP-MS method

中文关键词:  微波消解  电感耦合等离子质谱法  重金属  食品安全

英文关键词:microwave digestion  inductively coupled plasma mass spectrometry  heavy metals  food safety

中文摘要:

      目的 建立微波消解-ICP-MS测定食品中33种元素的检测方法, 内标法定量。方法 试样经硝酸-过氧化氢进行微波消解、赶酸、定容后利用ICP-MS进行分析测定。本方法选用7种元素作为内标, 对分析信号的本底和基体效应具有很好的补偿作用。同时引入碰撞反应气He, 可有效去除多原子离子的干扰。结果 该方法对各元素的检出限为0.005~0.5 μg/L, 相对标准偏差RSD值在0.58%~4.96%之间, 加标回收率在81.6%~109%之间, 对有证生物成分标准物质扇贝粉样品的分析结果与所给的标准值相吻合。结论 该方法简便快捷, 灵敏度高, 重现性好, 是分析食品样品中的多元素的可靠、高效的方法。

英文摘要:

      Objective To establish a method for determination of 33 kinds of elements in food by microwave digestion-ICP-MS and internal standard method. Methods The samples firstly was digested, acid-driven and volume controlled by nitric acid-hydrogen peroxide via microwave, and then be tested by the method of ICP-MS. Seven elements were selected as internal standard, which had a good compensation for the analysis of the signal background and the matrix effect. Furthermore, Helium was used as collision-reaction gas, which could effectively get rid of the disturbance of multi-atomic ion. Results The detection limit for each element was 0.005~0.5 g/L, the relative standard deviation (RSD) was 0.58%~4.96%, and the addition standard recovery was 81.6%~109%. The analysis result of the scallop powder elements was in accordance with the given standard. Conclusion The method is of convenience, high sensitivity and good reproducibility and it is a reliable and efficient method for the analysis of multi-elements in food samples.