微波消解-基体改进剂GFAAS法测定食品中铬

目的建立微波消解一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。

Determination of Chromiun in food by microwave dissolution and GFAAS

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. （NHg）3PO4, HNO3,L-Ascorbic acid were used as the matrix modifier to reduce the interference, Results The range of calibration curve was 0-15.0 Ixg/L and the correlation coefficient was over 0.998. The detection limit was 0.16}xg/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.