GC-MS Analysis Conditions and Optimization of Volatile Organic Compounds from Kunlun Asphalt
The pretreatment method for qualitative and quantitative analysis of volatile organic com-pounds in asphalt by GC-MS was optimized.On the one hand,the differences of solvent extraction(HS),static headspace(SE)and solid-phase microextraction(SPME)in the analysis of volatile organic com-pounds in asphalt by GS-MS were comparatively investigated.The results showed that solid-phase microex-traction technology was superior to solvent extraction and static headspace method in obtaining volatile organic compounds and peak area.On the other hand,the SPME-GC-MS method was optimized,and the effects of test matrix,sample quality,extraction time and extraction temperature were investigated.The optimized analy-sis conditions were obtained as follows:liquid paraffin was used as the matrix,sample quality was 1.0 g,ex-traction time was 20min,and extraction temperature was 120 ℃.The methodological test results show that un-der this condition,SPME-GC-MS has high sensitivity,good reproducibility,accuracy,and reliability,and can obtain the most abundant information on the types and quantities of compounds.
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