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首页> 外文期刊>Journal of Asian earth sciences >Simultaneous measurement of sulfur and lead isotopes in sulfides using nanosecond laser ablation coupled with two multi-collector inductively coupled plasma mass spectrometers
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Simultaneous measurement of sulfur and lead isotopes in sulfides using nanosecond laser ablation coupled with two multi-collector inductively coupled plasma mass spectrometers

机译：使用纳秒激光烧蚀结合两个多收集器电感耦合等离子体质谱仪同时测量硫化物中的硫和铅同位素

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摘要

We herein report the coupling of a nanosecond laser ablation system with a large-scale multi-collector inductively coupled plasma mass spectrometer (Nu1700 MC-ICPMS, NP-1700) and a conventional Nu Plasma II MC-ICPMS (NP-II) for the simultaneous laser ablation and determination of in situ S and Pb isotopic compositions of sulfide minerals. We found that the required aerosol distribution between the two spectrometers depended on the Pb content of the sample. For example, for a sulfide containing 100-3000 ppm Pb, the aerosol was distributed between the NP-1700 and the NP-II spectrometers in a 1:1 ratio, while for lead contents 3000 and 100 ppm, these ratios were 5:1 and 1:3, respectively. In addition, S isotopic analysis showed a pronounced matrix effect, so a matrix-matched external standard was used for standard-sample bracketing correction. The NIST NBS 977 (NBS, National Bureau of Standards; NIST, National Institute of Standards & Technology) Tl (thallium) dry aerosol internal standard and the NIST SRM 610 (SRM, standard reference material) external standard were employed to obtain accurate results for the analysis of Pb isotopes. In tandem experiments where airflow conditions were similar to those employed during stand-alone analyses, small changes in the aerosol carrier gas flow did not significantly influence the accurate determination of S and Pb isotope ratios. In addition, careful optimization of the flow ratio of the aerosol carrier (He) and makeup (Ar) gases to match stand-alone analytical conditions allowed comparable S and Pb isotope ratios to be obtained within an error of 2 s analytical uncertainties. Furthermore, the results of tandem analyses obtained using our method were consistent with those of previously reported stand-alone techniques for the S and Pb isotopes of chalcopyrite, pyrite, galena, and sphalerite, thus indicating that this method is suitable for the simultaneous analysis of S and Pb isotopes of natural sulfide minerals, and provides an effective tool to determine S and Pb isotope compositions of sulfides formed through multi-stage deposition routes.
机译：我们在此报告了纳秒激光烧蚀系统与大型多收集器电感耦合等离子体质谱仪（Nu1700 MC-ICPMS，NP-1700）和常规Nu Plasma II MC-ICPMS（NP-II）的耦合同时进行激光烧蚀并测定硫化物矿物的原位S和Pb同位素组成。我们发现，两个光谱仪之间所需的气溶胶分布取决于样品中的Pb含量。例如，对于包含100-3000 ppm Pb的硫化物，气溶胶以1：1的比例分布在NP-1700和NP-II光谱仪之间，而对于铅含量> 3000和<100 ppm，这些比例为5 ：1和1：3。另外，S同位素分析显示出明显的基质效应，因此将基质匹配的外标用于标准样品包围校正。使用NIST NBS 977（国家标准局NBS；国家标准技术研究所NIST）Tl（th）干气溶胶内标和NIST SRM 610（SRM，标准参考材料）外标来获得准确的结果。铅同位素分析。在串列实验中，气流条件类似于独立分析中所采用的条件，气溶胶载气流的微小变化不会显着影响S和Pb同位素比的准确测定。另外，通过对气溶胶载气（He）和尾气（Ar）的流量比进行仔细优化以匹配独立的分析条件，可以在2 s的分析不确定度范围内获得可比的S和Pb同位素比。此外，使用我们的方法获得的串联分析结果与以前报道的针对黄铜矿，黄铁矿，方铅矿和闪锌矿的S和Pb同位素的独立技术相一致，因此表明该方法适用于同时分析天然硫化物矿物的S和Pb同位素，为确定通过多阶段沉积途径形成的硫化物的S和Pb同位素组成提供了有效的工具。

著录项

  • 来源
    《Journal of Asian earth sciences》 |2018年第1期|386-396|共11页
  • 作者

    Yuan Honglin; Liu Xu; Chen Lu; Bao Zhian; Chen Kaiyun; Zong Chunlei; Li Xiao-Chun; Qiu Johnson Wenhong;

  • 作者单位

    Northwest Univ, State Key Lab Continental Dynam, Dept Geol, Collaborat Innovat Ctr Continental Tecton, Xian 710069, Peoples R China;

    Northwest Univ, Coll Chem & Mat Sci, Collaborat Innovat Ctr Continental Tecton, Xian 710069, Peoples R China;

    Northwest Univ, State Key Lab Continental Dynam, Dept Geol, Collaborat Innovat Ctr Continental Tecton, Xian 710069, Peoples R China;

    Northwest Univ, State Key Lab Continental Dynam, Dept Geol, Collaborat Innovat Ctr Continental Tecton, Xian 710069, Peoples R China;

    Northwest Univ, State Key Lab Continental Dynam, Dept Geol, Collaborat Innovat Ctr Continental Tecton, Xian 710069, Peoples R China;

    Northwest Univ, State Key Lab Continental Dynam, Dept Geol, Collaborat Innovat Ctr Continental Tecton, Xian 710069, Peoples R China;

    Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China;

    Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Laser ablation; MC-ICPMS; Sulfur isotope; Lead isotope; Sulfide;

    机译：激光烧蚀;MC-ICPMS;硫同位素;铅同位素;硫化物;

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