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| 分流比对烃类单分子氢同位素分析的影响 | |
| 引用本文： | 李中平,李立武,陶明信,王作栋,王 广,杜 丽,张明峰,石 磊.分流比对烃类单分子氢同位素分析的影响[J].岩矿测试,2010,29(3):221-224. |
| 作者姓名： | 李中平 李立武 陶明信 王作栋 王 广 杜 丽 张明峰 石 磊 |
| 作者单位： | 1. 中国科学院地质与地球物理研究所油气资源研究重点实验室,甘肃,兰州,730000 2. 北京师范大学地表过程与资源生态国家重点实验室,北京,100875 3. 国家地质实验测试中心,北京,100037 4. 中国原子能科学研究院,北京,102413 |
| 基金项目： | 国家自然科学基金项目资助，教育部重大项目资助，"中国科学院西部博士"项目资助 |
| 摘 要： | 在单体烃的氢同位素系统测定中,以甲烷为样品,选择不同的分流比(0.1、0.5、1.0、2.0、5.0、10.0),采用气相色谱-高温热转换-同位素比率质谱对相应的氢同位素比值进行研究。结果表明,不同的分流比对峰形、出峰面积及单体烃的氢同位素值有不同程度的影响,总体上随着分流比的增大,峰宽及峰面积呈现指数方式递减;特别是当分流比较小(小于1)时,导致氢同位素值测定结果的不确定度增大;分流比较大时,氢同位素值趋于稳定。文章对造成这种现象的原因进行了分析,认为在单体烃的氢同位素的分析中,选择较大的分流比不会导致明显的同位素分馏,从而对样品分析更为有利。 |
| 关 键 词： | 分流比 同位素比率质谱计 气相色谱 氢同位素比值 单体烃 |
| 收稿时间： | 6/5/2009 12:00:00 AM |
| 修稿时间： | 2009/12/21 0:00:00 |
Effect of Split Ratio on Hydrogen Isotope Ratio Analysis for the Single Molecule Hydrocarbons |
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| LI Zhong-ping,LI Li-wu,TAO Ming-xin,WANG Zuo-dong,WANG Guang,DU Li,ZHANG Ming-feng and SHI Lei.Effect of Split Ratio on Hydrogen Isotope Ratio Analysis for the Single Molecule Hydrocarbons[J].Rock and Mineral Analysis,2010,29(3):221-224. | |
| Authors: | LI Zhong-ping LI Li-wu TAO Ming-xin WANG Zuo-dong WANG Guang DU Li ZHANG Ming-feng and SHI Lei |
| Institution: | Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China;Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China;State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China;Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China;National Research Center for Geoanalysis, Beijing 100037, China;Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China;Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China;China Institute of Atomic Energy, Beijing 102413, China |
| Abstract: | In hydrogen isotope ratio analysis of single molecule hydrocarbons by gas chromatography-high temperature thermal conversion-isotope ratio mass spectrometry, different split ratios (0.1, 0.5, 1.0, 2.0, 5.0 and 10.0)were selected to study the corresponding hydrogen isotope ratios. The results showed that different inlet split ratios influenced in various extents on the peak area and peak width, namely, the peak area and peak width decreased exponentially with the increase of split ratios. Especially when split ratios were less than 1.0, the uncertainty of the hydrogen isotope determination results increased. And when the split ratios were relatively larger, hydrocarbon isotope determination results became stable. The reasons for this phenomenon were also discussed. The research results also showed that in the hydrogen isotope analysis, the choice of a larger split ratio did not lead to significant isotopic fractionation and was more favorable for the sample analysis. |
| Keywords: | split ratio isotope ratio mass spectrometer gas chromatography hydrogen isotope ratio single molecule hydrocarbon |
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