杨林飞，胡迎春，黄婷

株洲市疾病预防控制中心，湖南株洲412000

微波消解-石墨炉原子吸收测定花生中的鉻

杨林飞，胡迎春，黄婷

株洲市疾病预防控制中心，湖南株洲412000

目的为了解花生食用安全性，建立微波消解-石墨炉原子吸收法测定花生中的鉻的方法测定样品花生中鉻的含量。方法采用微波消解法对花生样品进行消解，采用石墨炉原子化器，波长357.9 nm下，对花生进行测定，塞曼效应作为背景校正。结果用建立的方法，测得10批市售花生中鉻的含量，结果10批花生样品铬含量在0.708 9～0.972 4 ug/g，均在正常范围内，同时此种方式检查精密度为1.52%，回收率在98.6%～102.1%之间，RSD为2.36%。结论该次研究使用微波消解-石墨炉原子吸收法测定，灵敏度高、选择性好、检出限低，精密度、准确度较高，同时所用试剂少、消解程度完全彻底、耗酸量少、安全、背景值低，能有效对花生中重金属镉含量进行测定。

花生；原子吸收分光光度法；鉻；重金属

［Abstract］Objective To know the food safety of peanuts by establishing the method of microwave resolution-graphite furnace atomic absorption to measure the chromium in peanuts.Methods The peanut samples were resolved by the microwave resolution method，the peanuts were measured by the graphite furnace atomizer with the wave length of 357.9nm and the Zeeman effect was used as the background correction.Results The chromium contents of 10 batches of commercially available peanuts were measured by the established method.The chromium contents of 10 batches of peanut samples were between 0.7089 ug/g to0.9724 ug/g，and all were in the normal range，the precision degree examined by this method was 1.52%，and the recycle rate was between 98.6%to102.1%，and RSD was 2.36%.Conclusion The microwave resolutiongraphite furnace atomic absorption in measuring the chromium in peanuts has a higher sensitivity degree，good choice，low detection limit，higher precision and accuracy，complete resolution degree，low acid consumption，safe and low background value，which can effectively measure the heavy metal chromium content in peanuts.

［Key words］Peanut；Atomic absorption spectrometry；Chromium；Heavy metal

铬存在于自然界，是人体必不可缺的微量重金属元素，其能有效促进机体脂质代谢、糖代谢。自然界中的铬存在形式分别主要为三价、六价，其中前者为人体所需元素，而后者则具有毒性，有引发癌症的可能性。六价铬元素有诱发因子突变的可能性，且较三价元素在机体更易被吸收，同时这两种铬离子表现形式亦可以在机体内相互转化，若人体食用的食物中铬含量过多有引发肺癌的可能性［2］。花生是日常饮食中较为常见食物，其含有丰富的蛋白质、维生素以及矿物钙、铁等营养元素，同时有人体所需的不饱和脂肪酸、氨基酸，能有效改善贫血、促进脑细胞发育、增强记忆等作用［3］。……