直接稀释-电感耦合等离子体质谱法测定海水中4种溶解态金属  

Determination of 4 dissolved metals in seawater by direct dilution-inductively coupled plasma mass spectrometry method

作　　者：张俊 姜伟 宁志铭 韦朝帅 ZHANG Jun;JIANG Wei;NING Zhi-ming;WEI Chao-shuai(School of Marine Sciences,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学海洋学院,广西南宁530004

出　　处：《海洋环境科学》2023年第3期466-470,共5页Marine Environmental Science

基　　金：2021年度广西高校中青年教师科研基础能力提升项目(2021KY0012)。

摘　　要：本文建立一种将海水样品稀释10倍后,直接使用电感耦合等离子体质谱法(ICP-MS)测定Cr、Cu、As、Cd等4种金属元素含量的分析方法。该方法使用自制标准海水作为基体匹配溶液,以He气体为碰撞气体,使用115In作为内标物质。分析结果显示,在0~0.200μg/L范围内,Cr、Cu、As、Cd的线性相关系数在0.9990以上,方法检出限分别为0.049μg/L(Cr)、0.027μg/L(Cu)、0.083μg/L(As)、0.009μg/L(Cd)。测试海水标准参考物质NASS-6和实际海水样品的加标回收率范围为92.1%~106.8%,检出限、准确度、精密度、信号稳定性等均能满足要求。该方法分析广西涠洲岛邻近海域海水样品的结果与火焰原子吸收光谱法偏差较小,可作为批量海水样品中Cr、Cu、As、Cd等4种溶解态金属的检测方法。A method was established for the simultaneous determination of Cr,Cu,As,Cd by inductively coupled plasma mass spectrometry(ICP-MS)after diluting seawater samples by 10 times.The method uses self-made standard seawater as the matrix matching solution,He gas as the collision gas,and"sin as the internal standard substance.The linear correlation coefficients of Cr,Cu,As and Cd were above 0.9990 in the concentration range of 0~0.200μg/L.The detection limit of theses metals was 0.049μg/L(Cr),0.027μg/L(Cu),nd Cd are above 0.990 in the concentration range of 0~0.200μg/L.The detection limit of theses metals was 0.049μg/L(Cr),0.027μg/L(Cu),0.083μg/L(As),0.009μg/L(Cd).The recovery range of NASS-6 and actual seawater samples were between 92.1%and 106.8%.The detection limit,accuracy,precision and signal long-term stability of this method can meet the requirements of Chinese specification for marine monitoring.This method has been used in the analysis of seawater samples in Weizhou island,Guangxi.The results show a small deviation compared with the FAAS method,so it can be used as the conventional detection method of trace metals in seawater,such as Cr,Cu,As,Cd.

关 键 词：电感耦合等离子体质谱法 海水 痕量金属 直接稀释 

分 类 号：P734.4[天文地球—海洋化学]