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

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0.005~0.5μg/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。

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

to establish the microwave digestion - icp-ms determination of 33 kinds of elements in food detection method, internal standard method. Microwave digestion sample by nitric acid, hydrogen peroxide, Catch acid, constant volume, with icp-ms analysis determination. Seven kinds of elements chosen as the internal standard, can be effectively flowing for signal analysis and matrix effect has a good compensation effect. He introduced collision reaction gas, which can effectively remove the interference of polyatomic ions. Underthe optimized experimental conditions, the method of each element of the detection limit of 0.002 to 0.002 ug/L, relative standard deviation is 0.62-4.7%, standard addition recovery rate of 87.3 to 105.1%, with the biological ingredients standard material scallop powder sample analysis results coincide with the values given. Quick method is simple, high sensitivity, good reproducibility, is the multiple elements in food samples by reliable and efficient method.