电感耦合等离子体质谱法测定水泥样品中的铅同位素比值  

Measurements of Lead Isotope Ratio in Cement by Inductively Coupled Plasma Mass Spectrometry

作　　者：陈建敏[1] 谈明光[1] 陆文伟[2] 李玉兰[1] 张桂林[1] 李燕[1] 

机构地区：[1]中国科学院上海应用物理研究所,上海201800 [2]上海交通大学,上海201800

出　　处：《分析化学》2005年第7期943-946,共4页Chinese Journal of Analytical Chemistry

基　　金：中国科学院知识创新工程重要方向性项目(KJCX2SWN01)资助

摘　　要：研究和讨论了用电感耦合等离子体质谱仪(ICPMS)测定铅的同位素比值测定时,影响测试结果的准确度和精密度的主要因素及其优化过程。在优化后的仪器分析条件下,测定5μg/L的NISTSRM981自然丰度铅同位素标准溶液的各对铅同位素比值,获得的207Pb/206Pb分析精度可优于0.1%。在该条件下测定了14个不同的水泥粉样品中的铅同位素比值,结果显示:铅的同位素比值分析技术可以用来示踪环境监测样品的铅污染源。The major parameters affecting the accurate and precise measurement of lead isotope ratios by inductively coupled plasma mass spectrometry (ICP-MS) were studied. The analytical precisions of lead isotope ratios for SRM 981 of three repeat measurements at lead concentration of 5 mu g/L were about 0.07% for Pb-207/Pb-206, 0.09% for Pb-208/Pb-206 and 0.3% for Pb-206/Pb-204, respectively. The proposed method was applied to the analysis of cement samples, and the analytical result shows that the method combined with multi-elemental analysis can be an ideal tool for characterizing sources and pathways of environmental lead pollution.

关 键 词：同位素比值 电感耦合等离子体质谱法 测定 水泥样品 电感耦合等离子体质谱仪 优化过程 分析条件 NIST 标准溶液 铅同位素 自然丰度 分析精度 铅污染源 环境监测 分析技术 精密度 准确度 水泥粉 

分 类 号：TQ172.16[化学工程—水泥工业]