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| AN ANALYSIS OF LIGHT HYDROCARBONS BY GAS CHROMATOGRAPHY AND ITS APPLICATION IN DETERMINING NATURAL GAS HYDRATE |
| CHEN Wei-ming, XU Ren-ting, LI Qing-xia, XIAO Xi-lian, BO Wei, ZHANG Qin |
| Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China |
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Abstract A method for analyzing adsorbed light hydrocarbons in soil by GC-FID for gas hydrate exploration has been developed. In this paper the acidolysis hydrocarbon equipment has been 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.
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Received: 10 July 2011
Published: 10 October 2012
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