An Analysis of Light Hydrocarbons by Gas Chromatography and Its Application in Determining Natural Gas Hydrate

详细信息   

• 责任者：Chen Weiming (Institute of Geophysical and Geochemical Exploration ; Chinese Academy of Geological Sciences ; Langfang 065000 ; China) ; Xu Renting
• 刊名：Geophysical and Geochemical Exploration
• 出版年：2012
• 卷期：36(5)
• 关键词：天然气水合物 ; gas hydrates ; 气相色谱法 ; gas chromatography
• 页码：p.775-782
• 图表：3 illus., 9 tables, 17 refs.
• 分类号：0900
• issnNo：ISSN1000-8918
• isbnNo：CN11-1906/P

摘要

A method for analyzing adsorbed light hydrocarbons in soil by GC-FID for gas hydrate exploration was developed. In this paper the acidolysis hydrocarbon equipment was improved, and the method is suitable for batch processing and can improve the efficiency. A method was adopted for the desorption of light hydrocarbons in head space by oscillation and heating. The optimization of main analytical conditions and quality assessment and control in analysis were discussed. The detection limits of the method for the light hydrocarbons in head space is 0.018 × 10^{^-6} （ methane）, The precision of the method is 6.6% （methane） ～ 16% （isobutane） RSD. The detection limits of the method for the acidolysis hydrocarbon is 0.016 μL/kg （methane）, and the precision of the method is 2.2% （methane） ～ 19% （pentane）RSD. The method has been applied to a great quantity of real sample analysis, with satisfactory results obtained.