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

Determination of Trace Metal Elements in Coastal and Estuarine Seawater by Polymer-Complexation-Ultrafiltration Technique and Inductively Coupled Plasma Mass Spectrometry

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Cu2+,Pb2+,Cd2+,Co2+,Ni2+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,10&)为1.2 ng/L(Cd)～9.8 ng/L(Cu),空白为1.1 ng/L(Cd,Ag)～9.1 ng/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。

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 ） 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.