MC-ICP-MS高精度Cu、Zn同位素测试技术  

High precision Cu,Zn isotope measurements by multi-collector ICP-MS

作　　者：侯可军[1] 李延河[1] 田有荣 秦燕[1] 谢桂青[1] 

机构地区：[1]中国地质科学院矿产资源研究所国土资源部成矿作用与资源评价重点实验室,北京100037 [2]赛默飞世尔科技(上海)有限公司,北京100007

出　　处：《矿床地质》2008年第6期774-781,共8页Mineral Deposits

基　　金：国家自然基金(40803001,40873003);国土资源大调查项目(1212010816039);公益性科研院所基本科研业务费(K2007-2-3,Ywf060712)项目的联合资助

摘　　要：过渡族元素同位素是国际上同位素地球化学研究的热点。测试技术的限制是制约过渡元素同位素研究发展的关键。笔者利用Neptune型多接收等离子质谱(MC-ICP-MS),采用Cu、Zn互为内标的方法对仪器的质量歧视进行了校正,对基质效应和测试方法的重现性进行了检验,建立了高精度的Cu、Zn同位素测试技术。在5个月内对实验室标准IMRCu和IMRZn进行了测量,结果分别为δ65CuNIST976=(0.34±0.08)‰(2SD,n=32),δ66ZnJMCZn=(-9.64±0.05)‰(2SD,n=26),δ67ZnJMCZn=(-14.37±0.16)‰(2SD,n=26),δ68ZnJMCZn=(-19.01±0.08)‰(2SD,n=26),分析精度达到国际同类实验室先进水平。对Cu、Zn同位素参考物质进行了对比测量,分析结果与报道值在误差范围内完全一致。Transitional metal isotope is now a new highly focused research point of isotope geochemistry, but its analytical techniques have become the main constraint on its development in recent years. Techniques for high-precision measurements of Cu, Zn isotope ratios using Neptune MC-ICPMS are reported in details in this paper, which include the correction of instrument mass bias, the assessment of matrix effects, and the long-term reproducibility. The reproducibility of the in-house standard IMR Cu and that of IMR Zn in five months are δ^65CuNIST976 = （0.34±0.08）‰（2SD, n =32）, δ^66ZnJMC Zn= （ -9.64±0.05）‰（2SD, n =26）, δ^67ZnJMC Zn= （ - 14.37 ±0.16）‰（2SD, n =26） and δ^68ZnJMC Zn = （ - 19.01 ±0.08）‰（2SD, n =26）. A study of these data in comparison with the Cu, Zn isotopes of the reference materials shows that the authors＇ results are in an excellent agreement with the data available.

关 键 词：地球化学 Cu、Zn同位素测定 MC-ICP-MS 质量歧视 基质效应 

分 类 号：P597[天文地球—地球化学]