微波消解ICP-MS法测定壮药小牛力中5种重金属的含量

Determination of Five Heavy Metals in Zhuang-drug Millettia pulchra Kurz var. Laxior(Dunn) Z. Wei by Inductively Coupled Plasma Mass Spectrometry with the Microwave Digestion

目的:建立电感耦合等离子体质谱(ICP-MS)法测定壮药小牛力中铅(Pb)、镉(Cd)、砷(As)、汞(Hg)、铜(Cu)5种重金属含量的方法。方法:样品经混合酸微波消解后,用电感耦合等离子体质谱仪测定壮药小牛力中铅、镉、砷、汞、铜5种重金属的含量。结果:该方法对各元素的检出限为0.04226~0.5010 ng·m L^(-1),回收率为93%~106%,国家标准物质茶叶(GBW10016)的测定值和标准值基本吻合。结论:所建立的方法快速、准确、灵敏度高,可用于测定壮药小牛力中5种重金属的含量。

Objective：To establish the analysis method for determination of the 5 kinds of heavy metals （Pb, Cd, As, Hg, Cu） in Zhuang-drug MiUettia pulchra Kurz var. Laxior （Dunn） Z. Wei. Methods： The samples were digested by mix acid using the microwave and determined of the 5 kinds of heavy metals （Pb, Cd, As, Hg, Cu） in Zhuang-drug Millettia pulchra Kurz var. Laxior（Dunn） Z. Wei. by inductively coupled plasma mass spectrometry（ICP-MS）. Results：Detection limits for above elements were 0. 04226 - 0. 5010 ng ·mL^-1 ,with the recoveries were 93% - 106%. The results obtained showed close agreement with the national standard substances of tea leaves（GBW10016）. Conclusion： This method is fast, accurate and reliable, which can be used to determinate the contents of the 5 kinds of heavy metals（ Pb, Cd, As, Hg, Cu ） in Zhuang-drug Millettia pulchra Kurz var. Laxior（Dunn）Z. Wei.