原子荧光光谱法测定不同产地郁金中砷和硒含量

摘要

After microwave decomposition, the contents of arsenic and selenium in eleven Curcuma aromatica samples were determined by hydride generation atomic fluorescence spectrometry, and plant standard reference materials were used to verify the accuracy and the precision of the analytical method. The experimental conditions were optimized. Under the optimum conditions, there was a good linear relationship between the fluorescence intensity and the contents of arsenic and selenium in the range of 0-20 μg/L with a correlation coefficient of 0.999 8 and 0.999 3, respectively. The recovery rate of arsenic and selenium were in the range of 97.15%-102.87%and 98.35%-101.76%. The results indicated that the contents of arsenic and selenium in different habits of Curcuma aromatica were significant deviation.%应用AFS-930型双道原子荧光光度计，采用湿法消解方式，在选定仪器工作条件下，建立了原子荧光光谱法测定郁金中砷和硒。以工作曲线法测定了不同产地郁金中砷和硒的含量，并用植物标准参考物质评价了分析方法的准确度。在0~20.0μg/L范围内As及Se的线性良好，线性回归方程为：As：If=48.9908 c+55.2433（r=0.9998）；Se：If=49.3717 c+46.5837（r=0.9993），砷和硒的回收率分别为97.15%~102.87%和98.35%~101.76%。研究结果表明不同产地郁金中As和Se的含量存在较大差异。