电感耦合等离子体质谱法测定海洋贝类中镉、铬、铜和铅

ICP-MS Determination of Cd, Cr, Cu and Pb in Seashell

摘要: 采用微波消解法处理海洋贝类样品,用电感耦合等离子体质谱法测定样品中镉、铬、铜和铅等4种重金属元素的含量。选择111Cd、53Cr、63Cu和208Pb等待测元素的同位素克服了质谱干扰。4种元素分别在一定的质量浓度范围内呈线性,检出限(3s)在0.005~0.17 μg·L-1之间。镉、铬、铜和铅的回收率分别为94.7%,102.1%,101.9%,105.3%;测定值的相对标准偏差(n=7)分别为4.3%,3.8%,1.5%,6.0%。

Abstract: Sample of seashell was pretreated by microwave assisted digestion, and the contents of Cd, Cr, Cu and Pb in sample solution were determined by ICP-MS. The isotopes (i.e., 111Cd, 53Cr, 63Cu and 208Pb) of the elements determined were selected to overcome the mass spectrometric interferences. Linear relationships of the 4 elements were kept in definite ranges, with detection limits (3s) in the range of 0.005-0.17 μg·L-1. Values of recovery and RSD′s (n=7) found were 94.7% and 4.3% for Cd, 102.1% and 3.8% for Cr, 101.9% and 1.5% for Cu, 105.3% and 6.0% for Pb.