| 单分子烃碳同位素分析方法及影响因素探讨 |
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| 关键词:monomolecular hydrocarbon carbon isotope baseline pattern accuracy |
| 基金项目:国家自然科学基金项目“泥岩烃源初次排烃过程的流体矿物界面地球化学研究”(编号:400030002) |
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| The Carbon Isotope Analytical Method for Monomolecular Hydrocarbons and Its Affecting Factors |
| The analytical method for carbon isotopic compositions of monomolecular hydrocarbon in crude oil and sediments is discussed in this paper. Through contrast test of monomolecular δC values between the pretreated alkane sample and the original alkane sample as well as between the n-alkane standard sample and its mixture with i-alkanes,and a discussion on three routine baseline pattern data-processing methods,this paper analyzes the error sources of carbon isotopic compositions of monomolecular hydrocarbon. It is shown that the sample pretreatment for separating n-alkanes from i-alkanes,the chromatogram temperature program and the data treatment have significant effects on the δC values of monomolecular hydrocarbon. This paper points out that such measures as the sample pretreatment for separating n-alkanes from i-alkanes with urea complex or 5A molecule sieving adsorption,the utilization of single temperature rate or the maintenance of gentle temperature gradient during the overflowing of the compound and the sectional data treatment for the multi-inflexion baseline pattern can improve the precision and accuracy of the measurement. |
| LI Ju-yuan.2004.The Carbon Isotope Analytical Method for Monomolecular Hydrocarbons and Its Affecting Factors[J].Acta Geoscientica Sinica,25(2):109-113. |
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