中文摘要：

建立了用碳稳定同位素比估算大气颗粒物中多环芳烃（PAHs）的方法，该方法包括二氯甲烷提取、薄层色谱纯化和气相色谱．燃烧系统．同位素质谱测定碳稳定同位素组成（6BC）；并用该方法对上海市大气颗粒物PM2.5中PAHs的来源进行估算。结果表明：采样点PM2.5中PAHs的δ^13 C值随着分子量的增加而减小；与潜在污染源中相应值相比，更接近于燃煤和生物质燃烧的相应值，表明采样点处PM2.5中的PAHs受燃煤和生物质燃烧的影响大于机动车尾气。PAHs来自燃煤、机动车尾气和生物质的贡献分别为3％-21％、29％-33％和46％-67％。这一结果与采样点的特殊环境一致，表明碳稳定同位素比能够定量估算大气细颗粒物中PAHs的来源。

英文摘要：

In this paper, a method is established to quantitatively partition fractional contributions of polycyclic aromatic hydrocarbons （PAHs） in fine atmospheric particulate matters by using stable carbon isotopic analysis. Dichloromethane extraction, TLC purification, and gas chromatography-combustion system and isotope mass spectrometry （GC/C/IRMS）, are used to measure the stable carbon isotope compositions （δ^13C）. The fractional contributions of coal combustion, vehicle exhaust and biomass burning to the PAHs in the fine particulate matters （PM2.5） collected in Jiading district, a suburb of Shanghai, are estimated. The results show that the δ^13C values increase with decreasing molecular weight. The coal combustion and biomass burning play bigger role than vehicle exhaust in the PAHs, compared to the δ^13C values of PAHs in all kinds of potential pollution sources. The estimated contributions from coal combustion, vehicle exhaust and biomass burning to PAHs of PM2.5 range from 3% - 21%, 29% - 33% and 46% - 67%, respectively, which agree well with the surrounding condition of the sampling site, indicating that it is feasible to estimate the fractional contributions of PAHs quantitatively by using stable carbon isotopic analysis.