W同位素分析方法进展及全岩样品的消解研究
PROGRESS IN ANALYTICAL METHODS OF TUNGSTEN ISOTOPE AND EXPERIMENTAL RESEARCH ON DIGESTION OF WHOLE ROCK SAMPLES
查看参考文献25篇
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文摘
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通过对W同位素分析方法，包括样品的消解、W的化学分离与纯化、W同位素的质谱测定进行比较研究发现，W同位素各种分析方法中AG1X-8 (200 mesh?400 mesh, C1~-)阴离子树脂是进行W的化学分离与纯化的有效载体，多接收器电感耦合等离子质谱仪(MC-ICPMS)是目前进行W同位素测定的最佳设备。以路南陨石和标准样品NIST SRM612为样本，进行以W同位素分析为目的的全岩样品消解实验研究，主要探讨温度对消解效果的影响。实验结果显示路南陨石在150℃下消解一周才能达到较好的消解效果，而NISTSRM612在150℃下消解48 h就可以充分消解。同时，实验结结果证明, 在使用PFA ( perfluoroalkoxy)材质的Savillex消解罐时，用H_2SO_4消除样品中的Ca、Mg 对W共沉淀的影响比较困难。 |
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其他语种文摘
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Based on research progresses review in W isotopic analytical methods and their geologic applications, advantages and disadvantages among different methods for W isotope analysis are compared in this paper. It is pointed out that Multi-Collector Inductively Coupled Plasma Mass Spectrometry (MC-ICPMS) is currently the best instrument for tungsten isotope measurement, and that chemical treatment process is the key step to acquiring W isotopic data with high precision and accuracy. Samples of Lunan meteorite and NIST SRM612 were selected for experimental research on digestion of whole rocks and temperature effect on sample digestion was mainly investigated. The experiments have showed that one week was needed for complete dissolution of the Lunan meteorite at 150 ℃ , whereas only 48 hours needed for NIST SRM612 at the same temperature. Meanwhile, the experimental results show that the co-precipitation problem of Ca and Mg with W is relatively difficult to be resolved by adding H_2SO_4 solution during the digestion process. |
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来源
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矿物岩石
,2013,33(3):86-92 【核心库】
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关键词
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W同位素
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离子交换树脂
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化学分离
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多接收器等离子体质谱仪
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地址
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1.
中国科学院地球化学研究所, 贵州, 贵阳, 550002
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中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵州, 贵阳, 550002
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-6872 |
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学科
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地质学 |
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基金
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中国科学院广州地球化学研究所知识创新工程领域前沿项目
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贵州省黔科合重大专项字
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文献收藏号
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CSCD:5005928
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