ICP-MS测定食品模拟物中的铅、砷、镉、镍、钴、锌

Determination of Heavy Metal Elements(Pb,As,Cd,Ni,Co and Zn) in Food Simulants by ICP-MS

建立了电感耦合等离子质谱（ICP-MS）测定食品模拟物中铅、砷、镉、镍、钴、锌的方法。分别用水、3％（v／v）乙酸水溶液、10％（v／v）乙醇水溶液、95％（v／v）乙醇水溶液在40℃下浸泡涂有内涂层的金属饮料罐两片罐和三片罐240h，得到食品模拟物样品。对于水、3％（v／v）乙酸水溶液、10％（v／v）乙醇水溶液三种食品模拟物样品，用电热板将样品蒸发至近干，用10％硝酸定容，上机检测。对于95％（v／v）乙醇模拟物样品，用电热板将样品蒸发至近干，剩余液体过滤后用10％（v／v）硝酸定容，上机测试。方法的检出限在0．5ng／mL到15ng／mL之间，线性良好，相关系数均邳．999；在两个浓度水平进行添加实验，大部分回收率在9213％，108％之间，相对标准偏差在0．3％～13．3％之间。方法准确度高，操作简单，是检测食品模拟物中铅、砷、镉、镍、钴、锌的有效方法。

A method for determination of Pb, As, Cd, Ni, Co, Zn in food simulants by ICP-MS was established. Beverage cans were filled with different kinds of food simulants and kept in thermostat at 40 ℃ for 240 h. Food simulants of distilled water, 3% （V/F） acetic acid, 10% ethanol （V/V） were evaporated and then diluted with 4% nitric acid. Food simulants of 95% ethanol （V/V） were evaporated, and then filtered before diluted with 4% nitric acid. The detection limits were from 0.5ng/mL to 15ng/mL. The linear correlations were over 0.999. Most of the recoveries at two concentration levels were from 92.3% to 108%, while the RSD from 0.3% to 8.0%. The method was precise and simple for determining these elements in food simulants.