聚乙烯亚胺螯合-超滤分离富集电感耦合等离子体质谱法测定海水中6种痕量金属元素

摘要

A method using polymer-complexation and ultrafiltration for matrix modification and inductively coupled plasma mass spectrometry (ICP-MS) for determination of trace level of metal elements (Cu2+ , Pb2+ , Cd2+ , Ni2+ and Ag+ ) in coastal and estuarine seawater has been developed. Full quantitative data collection mode and internal standard calibration curve were used for ICP-MS measurement. Under optimized conditions, the relative standard deviations (RSDs) were lower than 9.3％(0.20 μg/L,. n=5), and the standard added recoveries were 78.7％-95.2％. Detection limits (10 σ)were from 1.2 ng/L(Cd) to 9.8 ng/L(Cu). The method blank ranged from 1.1 ng/L (Cd, Ag) to 9.1 ng/L (Cu). The developed method has been applied to simultaneously determine the metals in coastal and estuarine seawater.%建立了高分子聚合物螯合-超滤(PCP-UF)分离富集、电感耦合等离子体质谱(ICP-MS)测定海水中痕量金属元素的方法.海水中的Cu(2+),Pb(2+),Cd(2+),Co(2+),Ni(2+)等金属离子与聚乙烯亚胺(PEI)形成高分子螯合物,经超滤截留、酸解离后,实现金属离子从海水中定量分离、富集.ICP-MS采用全定量数据采集模式、内标校正的标准校正曲线法进行定量分析.在最佳条件下,方法的相对标准偏差(RSD)在3.4%(Cd)～9.3%(Pb)之间(0.20μg/L,n=5),标准加入回收率为78.7%(Ag)～95.2%(Cu);检出限(DL,10σ)为1.2ng/L(Cd)～9.8ng/L(Cu),空白为1.1ng/L(Cd,Ag)～9.1ng/L(Cu).本方法可应用于近岸及河口海水样品中痕量金属元素的同时测定.