Elemental and isotopic abundances of rare gases in natural gases obtained by a quadrupole mass spectrometer
Elemental and isotopic abundances of rare gases in natural gases obtained by a quadrupole mass spectrometer
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四极杆质谱仪获得天然气中稀有气体的元素和同位素丰度
DOI：
10.2343/geochemj.16.279
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发表时间：
1982
影响因子：
0.8
通讯作者：
H. Wakita
中科院分区：
文献类型：
--
作者：
Y. Sano;T. Tominaga;H. Wakita
本文尝试用常规四极质谱仪测定天然气中稀有气体的元素丰度和同位素丰度。用该方法成功地测定了大气浓度水平上的Ar、Kr和Ar的元素丰度和同位素比值。对~ 4 He、~（20）Ne、~（36）Ar、~（84）Kr和~（132）Ar的测量，重现性为10-20%。除78 Kr/84 Kr、124 Kr/132 Kr和126 Kr/132 Kr外，Ar、Kr和Ar的同位素比值均在2%的实验误差范围内。测量的灵敏度和再现性通过大气空气的重复运行来检查。为了验证本方法对陆地天然气分析的适用性，对日本8种主要成分不同的典型天然气样品进行了测量。在这项工作中的QMS所观察到的值通常是在良好的协议与磁偏转质谱仪所获得的。在一些富CO2天然气样品中观察到放射成因40 Ar的富集。在富N2气体和富CH 4气体中观测到的Kr和Kr同位素比值在实验误差范围内与大气比值一致。
An attempt was made to determine both elemental and isotopic abundances of rare gases in natural gases by means of a conventional quadrupole mass spectrometer (QMS). Elemental abundances and isotopic ratios of Ar, Kr and Xe on the atmospheric concentration level were successfully measured by the present method. Reproducibility of 10–20% was obtained for 4He, 20Ne, 36Ar, 84Kr and 132Xe measurements. Isotopic ratios of Ar, Kr and Xe were determined within about 2% experimental errors, except for 78Kr/84Kr, 124Xe/132Xe and 126Xe/132Xe. Sensitivity and reproducibility of the measurements were examined by repeating runs of the atmospheric air. In order to verify the applicability of the present method to terrestrial natural gas analyses, eight typical samples of natural gases in Japan, with differences in major compositions, were measured. The values observed by a QMS in this work are generally in good agreement with those obtained by magnetic deflection mass spectrometers. Enrichment of radiogenic 40Ar was observed in some CO2-rich natural gas samples. Observed Kr and Xe isotopic ratios in N2-rich gases and CH4-rich gases coincided with the atmospheric ratios within experimental error.