氢化物原子荧光光度法测定大米中的总砷含量

Determination of Total Arsenic in Rice by Hydride Atomic Fluorescence Spectrophotometry

关键词:  砷  大米  原子荧光光度法

Key words:  arsenic  rice  atomic fluorescence spectrophotometry

摘要:

以强氧化剂硝酸+高氯酸(4:1)湿法消解样品,使用氢化物原子荧光光度法测定大米中的总砷含量,并对仪器的工作条件进行了优化。结果砷浓度0~10μg·L^-1标准曲线的线性方程为If=361.037C+30.859,相关系数0.9999,精密度0.8%,检出限0.0058μg·L^-1,回收率为95.0%~110.0%。该方法操作简便快速,精密度、准确度、灵敏度均能满足分析要求。

Abstract:

By wet digestion samples with strong oxidizer nitrate and perchlorate (4:1), the total arsenic in rice was determined by hydride atomic fluorescence spectrophotometry, and the instrument conditions were optimized.The linear equation of arsenic standard curve within the concentration of 0~10μg·L^-1 was If=361.037C+30.859.The correlation coefficient was 0.9999, the accuracy was 0.8%, the detection limit was 0.0058μg·L^-1, and the recovery was 95.0%~110.0%.The method is simple and convenient, and its precision, accuracy, sensitivity can meet the analytical requirements.