Measurement Technology of Noble Gas Isotopes in Natural Gases
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摘要: 在天然气稀有气体同位素分析技术方面,目前国内存在着主机辅助设备不足和检测项目较少等急需解决的问题,为此,本文建立了高真空、低漏率和低本底的天然气进样系统,成功地解决了实验室分析过程中空气Ar对天然气样品Ar的污染,获得了天然气中40 Ar/ 36Ar的准确值,新测比值较国内外已发表的40 Ar/ 36Ar值普遍高,二者差值的大小与天然气中Ar的含量密切相关。同时,应用自制的液氮调温冷阱实现了Ar与Kr+Xe的粗分离和天然气Kr与Xe同位素组成的检测.Abstract: A high vacuum purification line with lower leakage and lower background level had been established.The contamination of atmospheric argon to the samples was eliminated.The author determined the40/36Ar ratios of the samples analyzed previously using new method. Precise sup>40/36Ar ratio is obtained by this system.The sup>40/36Ar ratio observed by the new method is significantly higher than the previously determined ones, and the discrepancy was related to the Ar content of nature gas.Separating Ar from Kr and Xe is basically successful by temperature-modulated cold finger Kr and Xe isotopic compositions then can he measured.
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Key words:
- natural gas /
- noble gas isotope /
- analyzing technology
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