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建立石墨化碳(GCB)为吸附剂的动态采样系统,可实现液化石油气(LPG)中芳烃杂质的采样和同步萃取富集。LPG中的芳烃杂质(苯、甲苯、二甲苯、苯乙烯和萘)被快速捕集后,进行气相色谱-质谱(GC-MS)定性定量分析。与C18和苯乙烯二乙烯苯吸附剂(PS-DVB)相比,GCB填充柱对芳烃杂质的萃取效率最高。评价了基于GCB填充柱采样的吸附效率、重现性和贮存稳定性。采样和分析方法对氮气模拟气流中8种芳烃的定量分析线性范围为15~1 000μg/m~3。所开发的方法具有回收率高(92.9%~109.0%)、检出限低(1.0~6.2μg/m~3)、准确性好(相对标准偏差为0.6%~5.8%)和准确度高(标准偏差为0.8%~8.2%)等优点。
The establishment of a dynamic sampling system of graphitized carbon (GCB) as adsorbent enables the sampling and simultaneous extraction and enrichment of aromatic impurities in liquefied petroleum gas (LPG). Aromatic impurities (benzene, toluene, xylene, styrene and naphthalene) in LPG were rapidly captured and then subjected to gas chromatography-mass spectrometry (GC-MS) qualitative and quantitative analysis. Compared with C18 and styrene-divinylbenzene sorbent (PS-DVB), GCB packed column has the highest extraction efficiency for aromatic impurities. The adsorption efficiency, reproducibility and storage stability of GCB-packed columns were evaluated. The linear range of the quantitative analysis of eight aromatics in simulated nitrogen gas streams was 15-1000 μg / m 3 by sampling and analysis methods. The developed method has the advantages of high recovery rate (92.9% ~ 109.0%), low detection limit (1.0 ~ 6.2μg / m ~ 3), good accuracy (relative standard deviation of 0.6% ~ 5.8%) and high accuracy Standard deviation of 0.8% ~ 8.2%) and other advantages.