ICP-MS测定沙葱中5种重金属元素

摘要

建立电感耦合等离子体质谱法(ICP-MS)同时测定沙葱样品中铅(Pb)、铬(Cr)、镉(Cd)和镍(Ni)、铜(Cu)含量的方法.样品加HNO3和H2O2后采用微波消解进行预处理,探索了微波消解样品的实验条件,并对ICP-MS工作参数进行优化和选择.结果表明:该方法测定沙葱中5种元素的线性关系良好(r=0.9997~0.9999),方法检出限为0.0015μg/L~0.0101μg/L,重复性实验的相对标准偏差为1.3%~3.4%,回收率为97.85%~100.09%.%The method of simultaneous determination of 5 heavy metals (Ni, Pb, Cd, Cr, Cu)in Allium mon-golicum regel by inductively coupled plasma mass spectroscopy (ICP-MS) was studied. The sample of Allium mongolicum regel after added into HNO3 and H2O2 was pre-processed by means of microwave dissolving tech-nique. The experimental conditions of the microwave digestion sample were researched and the experimental pa-rameters of ICP-MS were discussed and optimized. The results showed that the determined method of the simul-taneous determination of 5 heavy metals in Allium mongolicum regel had good linear relationship (r=0.9997-0.9999), the detection limit of the method was 0.0015 μg/L-0.0101 μg /L, the relative standard derivation of the developed method was 1.3 % -3.4 %, its mean recovery was 97.85 % -100.09 %, the measured value of the standard matter in agreement with the standard value.