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用于单体氢同位素分析的混合溶剂洗脱5A分子筛吸附正构烷烃的方法
Elution of Adsorbed n-alkanes by 5A Molecular Sieve Using Solvent Mixtures for Compound-Specific Hydrogen Isotopic Analysis

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文摘 混合溶剂萃取洗脱5A分子筛吸附正构烷烃的方法在单体碳同位素分析研究中已得到了应用。由于5A分子筛在长时间加热条件下可能对有机分子的氢交换反应具有一定的催化作用,因此对于该方法能否用于正构烷烃的单体氢同位素分析需要做进一步研究。本文以两种不同类型原油的饱和烃和正构烷烃混合标准样品为对象,采用环己烷-正戊烷溶剂和氢氟酸溶解-正戊烷溶剂洗脱5A分子筛吸附的正构烷烃,对比分析两种萃取方式的分离效果,并分别测定了正构烷烃的单体氢同位素比值。结果表明:两种萃取方式都得到了纯化效果良好的正构烷烃组分,氢同位素测定结果的差值总体上小于4‰,在仪器分析误差范围内。经过三次环己烷-正戊烷洗脱方式获得正构烷烃回收率平均值为58%,氢氟酸溶解-正戊烷洗脱方式经过多次萃取操作获得正构烷烃回收率平均值为68%。尽管环己烷-正戊烷洗脱方式提取正构烷烃的效率较低,并且涉及在分子筛条件下多次较长时间的加热过程,但这两个因素没有导致氢同位素发生明显的分馏或交换过程,适合用于正构烷烃分离、纯化以及单体氢同位素测定。
其他语种文摘 The extraction procedure using solvent mixtures has been used to elute n-alkanes adsorped by 5A molecular sieve and subsequent stable carbon isotope ratio analysis of individual n-alkanes. However, a 5A molecular sieve may catalyze the hydrogen exchange of organic molecules during long-term heating. Therefore, the usage of this method for hydrogen isotopic analysis needs to be evaluated. Two different types of crude oil saturated hydrocarbon and n-alkanes mixed standard samples were used as the object for this study. The extraction method using cyclohexane and n-heptane solvent mixtures and another method evolving the digestion with hydrofluoric-acid and solvent extraction were both used to elute adsorbed n-alkanes by the 5A molecular sieve. The separation efficiency of the two methods was compared, and both carbon and hydrogen isotopes of obtained n-alkanes have been analyzed. Results show that the two methods enable excellent separations of n-alkanes, and yield variations of the hydrogen isotope ratios smaller than 4‰, within uncertainty. The average recovery of n-alkanes obtained by three-time solvent extraction was 58%, whereas that obtained by hydrofluoric acid dissolution and solvent extraction was 68%. Although cyclohexane and n-heptane solvent mixture has lower extraction efficiency and involves multiple heating processes, these two factors do not result in significant fractionation or exchange of hydrogen isotopes, indicating that this method can be applied to the separation and purifying of n-alkanes and subsequent compound-specific hydrogen isotopic analysis.
来源 岩矿测试 ,2017,36(4):413-419 【核心库】
DOI 10.15898/j.cnki.11-2131/td.201611030166
关键词 5A分子筛 ; 吸附 ; 分离 ; 正构烷烃 ; 氢同位素
地址

中国科学院广州地球化学研究所, 有机地球化学国家重点实验室, 广东, 广州, 510640

语种 中文
文献类型 研究性论文
ISSN 0254-5357
学科 化学
基金 国家自然科学基金 ;  国家自然科学基金创新研究群体项目
文献收藏号 CSCD:6068220

参考文献 共 22 共2页

1.  Li M. Hydrogen isotopic compositions of individual alkanes as a new approach to petroleum correlation:Case studies from the Western Canada sedimentary basin. Organic Geochemistry,2001,32(12):1387-1399 被引 6    
2.  Schimmelmann A. D/H ratios in terrestrially sourced petroleum systems. Organic Geochemistry,2004,35(10):1169-1195 被引 11    
3.  Dawson D. The effect of source and maturity on the stable isotopic compositions of individual hydrocarbons in sediments and crudeoils from the Vulcan Sub-basin,Timor Sea,Northern Australia. Organic Geochemistry,2007,38(7):1015-1038 被引 8    
4.  Aboglila S. Use of biomarker distributions and compound specific isotopes of carbon and hydrogen to delineate hydrocarbon characteristics in the East Sirte Basin (Libya). Organic Geochemistry,2010,41(12):1249-1258 被引 2    
5.  Jia W. Isotopic compositions and biomarkers in crude oils from the Tarim Basin:Oil maturity and oil mixing. Organic Geochemistry,2013,57:95-106 被引 2    
6.  张文正. 原油轻烃单体系列GC/C/MS在线碳同位素分析方法. 石油实验地质,1992,14(3):302-311 被引 5    
7.  张文正. 液态正构烷烃系列、姥鲛烷、植烷碳同位素研究. 石油勘探与开发,1992,19(5):32-41 被引 19    
8.  王欢业. 地质样品正构烷烃组分分离纯化的部分问题探究. 岩矿测试,2011,30(1):1-6 被引 3    
9.  Chen S. Carbon isotope analyses of n-alkanes released from rapid pyrolysis of oil asphaltenes in a closed system. Rapid Communications in Mass Spectrometry,2016,30(15):1779-1786 被引 1    
10.  Ellis L. Analytical improvements in IRM-GC/MS analyses:Advanced techniques in tube furnace design and sample preparation. Organic Geochemistry,1998,29(5):1101-1117 被引 3    
11.  董爱正. 饱和烃单体化合物稳定碳同位素测定方法. 石油勘探与开发,1996,23(2):98-102 被引 11    
12.  朱雷. 吸附法分离饱和烃组分在石油地球化学中的应用. 石油大学学报(自然科学版),1999,23(2):30-34 被引 6    
13.  杜丽. 饱和烃经5A分子筛络合前后单体烃碳同位素分析对比研究. 沉积学报,2005,23(4):747-752 被引 6    
14.  Grice K. An improved and rapid 5A molecular sieve method for gas chromatography isotope ratio mass spectrometry of n-alkanes (C_8-C_(30)+). Organic Geochemistry,2008,39(3):284-288 被引 7    
15.  李钜源. 单分子烃碳同位素分析方法及影响因素探讨. 地球学报,2004,25(2):109-113 被引 7    
16.  王宁. 尿素络合法分离-气相色谱/同位素质谱法分析土壤和植物中低含量(ppm级)正构烷烃的碳同位素. 岩矿测试,2015,34(4):471-479 被引 5    
17.  Tolosa I. Utility of 5A molecular sieves to measure carbon isotope ratios in lipid biomarkers. Journal of Chromatography A,2007,1165(1/2):172-181 被引 4    
18.  Jimenez-Cruz F. Molecular size evaluation of linear and branched paraffins from the gasoline pool by DFT quantum chemical calculations. Fuel,2004,83(16):2183-2188 被引 4    
19.  段毅. 沉积物的单体异构和环烷烃碳同位素研究. 科学通报,2004,49(2):199-202 被引 9    
20.  张逐月. 5A分子筛吸附混合溶剂洗脱-气相色谱-同位素质谱分析土壤中正构烷烃单体碳同位素. 岩矿测试,2012,31(1):178-183 被引 4    
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