ICP-MS测定PM_(2.5)中痕量重金属及铅同位素  

Determination of trace heavy metals and lead isotopes in PM_(2.5) by inductively coupled plasma mass spectrometry

作　　者：陈锦芳[1,2] 郑金玲[1] 叶龙翔 陈进生[2] 

机构地区：[1]集美大学生物工程学院,厦门361021 [2]中国科学院城市环境研究所,厦门361021

出　　处：《分析试验室》2014年第4期399-403,共5页Chinese Journal of Analysis Laboratory

基　　金：国家自然科学基金项目(51004053);农业部东海海水健康养殖重点实验室开放基金项目(EHME201201);中国科学院城市环境与健康重点实验室开放基金项目(KLUEH201110);福建省大学生创新训练项目(201310390058);李尚大集美大学学科建设基金项目(ZC2012008)资助

摘　　要：建立了HNO3-H2O2湿法消解、电感耦合等离子体质谱（ICP-MS）同时测定PM2.5样品中痕量重金属Cr，Ni，Cu，As，Cd，Pb和Pb同位素的方法。通过内标校正克服了基体效应、物理效应和仪器的长短期漂移的干扰。在ICP-MS优化参数下，测定的痕量元素及Pb同位素的标准曲线相关系数均优于0.9997，5种痕量元素的方法检出限在0.01～0.07 μg／L之间，4种Pb同位素的方法检出限在0.014～0.07 μg／L之间。通过测定滤膜标准物质（GBW（E）080212）和Pb同位素标准物质（NIST981）考察了方法准确性，测定值均在标准值范围内。当Pb质量浓度大于10 μg／L时，浓度对Pb同位素比值的测量影响不显著。运用该方法测得厦门市PM2.5中6种痕量重金属元素的RSD小于4.8％，Pb同位素RSD小于0.5％。A method for the detection of six trace heavy metal elements Cr, Ni, Cu, As, Cd, Pb and four lead isotopes in PM2.5 by HNO3 -H2O2 digestion and ICP-MS was established. By the correction of internal elements, the effects of matrix and physics, and fluctuation of instrument were overcome effectively. Under the optimum instrumental operation parameters, the correlation coefficients of working curves of six elements and lead isotopes were over 0.9997. The detection limits of five trace elements and four lead isotopes were 0.01 ～ 0.07 μg/L and 0.014 ～ 0.07 μg/L, respectively. The mean values of national standard reference material GBW （E）080212 and NIST981 were in good agreement with certified standard values. It was found that the relative standard deviation （RSD） of lead isotope was stable when the concentration of lead was more than 10 μg/L. Using this method, the detection system of PM2.5 has a good stability with RSDs of six trace elements less than 4.8%, and with RSD of lead isotopes less than 0.5%. It shows that the method of determining the trace elements and lead isotopes in PM2.5 by inductively coupled plasma-mass spectrometry is simple, accurate and stable.

关 键 词：PM2 5 重金属 铅同位素 ICP-MS 

分 类 号：O657.63[理学—分析化学]