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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第34卷

期数:

2012年第04期

页码:

53-56

栏目:

基础地质与矿产地质

出版日期:

2012-12-20

文章信息/Info

Title:

Characteristic of Organic Compound Secondary Ion Mass Spectrometry and Its Crack Mechanism

作者:

郑忠文¹; 2; 刘建朝¹; 李荣西¹

1.长安大学 地球科学与资源学院,陕西 西安 710054; 2.陕西延长石油集团有限责任公司,陕西 延安 716000

Author(s):

ZHENG Zhong-wen¹; 2;  LIU Jian-chao¹;  LI Rong-xi¹

1. School of Earth Sciences and Resources, Chang'an University, Xi'an 710054, Shaanxi, China; 2. Shaanxi Yanchang Petroleum CO., LTD., Yan'an 716000, Shaanxi, China

关键词:

二次离子质谱;  角质体;  化学键;  解离能;  裂解;  有机组分;  烃源岩;  煤

Keywords:

secondary iron mass spectrometry;  cutinite;  chemical bond;  dissociation energy;  crack;  organic compound;  source rock;  coal

分类号:

P618.130.2

DOI:

-

文献标志码:

-

摘要:

二次离子质谱(SIMS)技术近年来被广泛用于分析煤和油气烃源岩有机组分化学成分和结构特征。在介绍SIMS质谱图解析方法的基础上,分析了有机组分二次离子组成特征; 在综合研究有机组分SIMS 质谱图特征的基础上,应用化学动力学原理对有机组分SIMS 质谱裂解机理进行了探讨。结果表明:有机组分以芳香核为基本结构单元,且含有杂环并带有多种含氧基团和支链; 有机组分SIMS 质谱裂解由其复杂大分子结构中烷基苯不同化学键的解离能大小决定的; 有机质结构中α碳和β碳之间的α—β键和支链碳的C—C键解离能最弱,有机化学结构中的α—β键和支链碳的C—C键容易断裂; 与苯环相连支链中,(C₆H₅)CH₂—C₂H₅结构中的α—β键和支链碳的C—C键容易断裂而形成(C₆H₅)CH⁺₂(91)、C₂H⁺₅(29)和CH⁺₃(15)等碎片离子,这也是有机组分SIMS质谱图中最主要的碎片离子峰。

Abstract:

Secondary ion mass spectrometry(SIMS)technology is widely used to analyze the chemical composition and structure characteristics of organic compound from coal and petroleum source rocks recently. Analytical method for mass spectrum of SIMS was introduced, and the characteristic of secondary ion composition of organic compound was analyzed; characteristic of mass spectrum of organic compound SIMS was comprehensively studied, and the cracking mechanism was discussed by the means of chemical kinetics principle. The results showed that aromatic nucleus was the basic structural unit of organic compound, which contained heterocycle with various oxygen-containing groups and branched chains; the crack of organic compound SIMS was controlled by the dissociation energy of different chemical bonds in the complex macromolecular structure of organic compound; the dissociation energy of α—β bond of α-carbon and β-carbon and C—C bond of branched-chain carbon were weakest in the structure of organic matter, and α—β bond and C—C bond of branched-chain carbon were easily fractured in the structure of organic chemistry; α—β bond in the structure of(C₆H₅)CH₂—C₂H₅ and C—C bond of branched-chain carbon were easily fractured to form fragment ions including(C₆H₅)CH⁺₂(91), C₂H⁺₅(29)and CH⁺₃(15)in branched chain connected with benzene ring, which were the main peaks of fragment ions in mass spectrum of organic compound SIMS.

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备注/Memo

备注/Memo:

收稿日期:2012-10-25
基金项目:国家自然科学基金项目(40173005)
作者简介:郑忠文(1963-),男,陕西三原人,陕西延长石油(集团)有限责任公司高级工程师,长安大学工学博士研究生,

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更新日期/Last Update: 2012-12-20