中文摘要：

收集3种农作物秸秆玉米,水稻和小麦露天燃烧排放的颗粒物样品,并利用气相色谱-质谱（GC-MS）对样品中的34种多环芳烃（PAHs）进行分析,研究颗粒态PAHs的排放因子及可用于源解析的诊断参数.结果表明,3种秸秆燃烧总PAHs的排放因子为644.18～1798.13μg/kg;其中4环PAHs在秸秆燃烧样品中含量最高,约占38.8%～58.8%,6环PAHs所占比例相对较小,约占5.72%～15.17%.PAHs中部分单体具有相对较强致癌性,对环境和人体健康的影响不可忽视.首次检测分子量为300的高分子多环芳烃二苯并[a,e]荧蒽.在玉米、水稻和小麦秸秆燃烧排放颗粒物中的排放因子分别为6.70,2.77和2.92μg/kg.此外,研究发现Ba P/Bghi P,Phe/Phe＋Ant和Flu/（Flu＋Pyr）比值可以作为较好的区分秸秆燃烧与其他来源的诊断参数。

英文摘要：

Three straw burning smokes in lab simulating straw open burning mode were collected by using a sampler of high-flow capacity. 34 particulate polycyclic aromatic hydrocarbons（PAHs） were analyzed by GC-MS to investigate their emission factors and diagnostic ratios. The emission factors of PAHs from three straw burning smoke ranged from about 644.18～1798.13μg/kg. Four-rings PAHs are the most abundant PAH species in all samples, and their proportion to total PAHs ranged from 38.8% to 58.8%. The contributions of six-rings PAHs in TSP samples ranged from 5.72% to 15.17%. Although the contributions of six-rings PAHs were low in total PAHs, their impacts on human health and environment were critical for its high carcinogenicity. High-rings PAH Dibenzo [a,e] fluoranthene was firstly determined from straw burning smokes, its emission factor from corn, rice and wheat straw burning smoke was measured at about 6.70, 2.77 and 2.92μg/kg, respectively. Some diagnostic ratios such as Benzo（a）pyrene to Benzo[ghi]perylene（Ba P/Bghi P）, phenanthrene to phenanthrene plus anthracene（Phe/（Phe＋Ant）） and fluoranthene to fluoranthene plus pyrene（Flu/（Flu＋ Pyr）） were also identified in this study.