微波消解-流动注射-氢化物发生-原子吸收法测定中药材中的汞和砷

DETERMINATION OF ARSENIC AND MERCURY IN TRADITIONAL CHINESE DRUGS BY MICROWAVE DIGESTION-FLOW INJECTION-HYDRIDE GENERATION-ATOM ABSORPTION SPECTROMETRY

建立了用微波消解处理样品,流动注射-氢化物发生-原子吸收法检测中药材中汞和砷含量的方法。汞在0.002～0.02mg/L浓度范围内线性良好,检出限为0.0004mg/L;砷在0.02～0.16mg/L浓度范围内线性良好,检出限为0.001mg/L,汞和砷的线性相关系数均大于0.9999;汞、砷的回收率分别为85.0%～93.8%、89.4%～102.0%,相对标准偏差分别为5.5%和4.1%。

A method of determining Hg and As in traditional chinese drugs was established.Samples were digested with microwave preparation system, then determined by using flow injection-hydride generation- atom absorption spectrometry. The linear range of Hg was 0.002-0.02 mg/L with detection limit of0.000 4 mg/L, and the linear range of As was 0.02-0.16 mg/L with detection limit was 0.001 mg/L. Both of the coefficients of correlation were more than 0.9999. The recoveries of Hg and As were in the range of 85.0 %-93.8 % and 89.4%-102.0 %. The relative standard deviation was 5.5% and 4.1% respectively.