中文摘要: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IMR Cu和IMR Zn进行了测量,结果分别为δ65Cu NIST 976=(0.34±0.08)‰(2SD,n=32),δ66ZnJMC Zn=(-9.64±0.05)‰(2SD,n=26),δ67ZnJMC Zn=(-14.37±0.16)‰(2SD,n=26),δ68 Zn JMC Zn=(-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。
中文关键词:地球化学 Cu、Zn 同位素测定 MC-ICP-MS 质量歧视 基质效应
Abstract: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 δ65Cu NIST 9.76=(0.34±0.08)‰(2SD, n=32), δ66ZnJMC Zn=(-9.64±0.05)‰(2SD, n=26), δ67ZnJMC Zn= (-14.37±0.16)‰(2SD, .n=26) and δ68Zn JMC 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.
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基金项目: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
引用文本:
侯可军,李延河,田有荣,秦 燕,谢桂青.2008.MC-ICP-MS高精度Cu、Zn同位素测试技术[J].矿床地质,27(6):774~781侯可军,李延河,田有荣,秦 燕,谢桂青.2008.High precision Cu,Zn isotope measurements by multi_collector ICP-MS[J].Mineral Deposits27(6):774~781
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