【摘要】 目的建立微波消解-石墨炉原子吸收法测定食品中铬的分析方法。方法样品经微波消解,以磷酸铵溶液、硝酸+抗坏血酸作混合基体改进剂,样品经稀释后利用仪器全自动进样系统,采用石墨炉原子吸收法测定食品中铬的含量。结果选定了最佳测量条件,该方法的灵敏度、精密度均能满足检测工作的需求。本法铬的含量0~15.0μg/L范围内呈线性关系,线性相关系数大于0.998,本法检出限为0.16μg/L。相对标准偏差为1.9%~2.6%,加标回收率为92.8%~103.8%。结论本法简便、快速、灵敏度和精密度高。适用于食品中铬含量的测定。更多还原

【Abstract】 Objective To determine the chromium in food by microwave dissolution and graphite furnace atomic absorption spectroscopy.Methods The samples were digested by close-vessel microwave dissolution system.(NH4)3PO4, HNO3,L-Ascorbic acid were used as the matrix modifier to reduce the interference.Results The range of calibration curve was 0~15.0μg/L and the correlation coefficient was over 0.998.The detection limit was 0.16μg/L,the relative standard deviation 1.9%~2.6%and recovery 92.8%~103.8%.Conclusions This method is simple,rapid and the analytical results meet the demands of accuracy and precision.更多还原