石墨炉原子吸收光谱法测定食品中铬  

Determination of chromium in food by graphite furnace atomic absorption spectrometry

作　　者：刘楠[1] 武景福[1] 李晓 曹婷婷 张爱霞 LIU Nan;WU Jingfu;LI Xiao;CAO Tingting;ZHANG Aixia(Sanmenxia City Center for Disease Control and Prevention,Henan472000,China)

机构地区：[1]三门峡市疾病预防控制中心

出　　处：《医学动物防制》2019年第10期961-963,共3页Journal of Medical Pest Control

摘　　要：目的研究食品安全风险监测中铬分析的特点,建立有效和准确的石墨炉原子吸收光谱法测定食品中铬的检测方法。方法采用微波消解、湿法消解、高压消解和干灰化法4种前处理方式消解样品,加入磷酸铵、磷酸二氢铵和钯盐等基体改进剂消除样品干扰、优化仪器条件,进行石墨炉原子吸收光谱法测定食品中铬。结果测定铬的最佳基体改进剂为磷酸二氢铵。4种前处理方式的加标回收率差异无统计学意义(F=1. 026,P> 0. 05),精密度差异无统计学意义(F=0. 998,P> 0. 05)。测定铬的定量限为1. 5μg/L,线性范围0~16. 0μg/L,加标回收试验的回收率在90%~104%之间。结论石墨炉原子吸收光谱法准确、可靠、灵敏度和精密度高,可满足食品中铬的风险监测要求。Objective To study the characteristics of chromium in food safety risk monitoring,and establish an effective and accurate method for the determination of chromium in food by graphite furnace atomic absorption spectrometry. Methods The samples were digested by microwave digestion,wet digestion,high pressure digestion and dry ashing. The matrix modifiers such as ammonium phosphate,ammonium dihydrogen phosphate and palladium salt were added to eliminate sample interference and optimize the instrument conditions,and determine chromium in food by graphite furnace atomic absorption spectrometry. Results The best matrix modifier for the determination of chromium is ammonium dihydrogen phosphate. There was no significant difference in the recovery rate of the four pretreatment methods(F = 1. 026,P > 0. 05). There was no significant difference in precision(F = 0. 998,P > 0. 05). The limit of quantification of chromium was 1. 5 μg/L,the linear range was 0 ~ 16. 0 μg/L,and the recovery of the spiked recovery test was between 90% and 104%. Conclusion Graphite furnace atomic absorption spectrometry is accurate,reliable,sensitive and precise,and can meet the risk monitoring requirements of chromium in food.

关 键 词：食品 铬 石墨炉原子吸收光谱法 

分 类 号：R155.5[医药卫生—营养与食品卫生学]