中文摘要：

报道了乌鲁木齐城区空气颗粒物中多环芳烃（PAHs）化合物的稳定碳同位素组成特征，解析了PAHs的来源，气相色谱，燃烧系统，同位素质谱分析表明，该市空气颗粒物中PAHs化合物的δ^13C值为-23．5‰～-31．3‰，随着分子量的增大，PAHs化合物中^13C含量降低利用同位素质量平衡二元模型，计算了燃煤污染源与机动车排气对城区苯并（a）芘、茚并（1，2，3-cd）芘和苯并（ghi）芄的贡献，前者分别为72％、97％和95％，后者分别为28％、3％和5％．苯并（a）芘、茚并（1，2，3-cd）芘和苯并（ghi）花的相对含量分别为2．8％，29．1％和25．1％，占PAHs总量的57％，计算的三者的燃煤污染源总贡献量为78．6％，与利用化学质量平衡模型计算得出的结果（84％的PAHs源于燃煤）相近。

英文摘要：

The source of PAHs was analyzed using isotop mass equilibrium dyadic model of stable carbon isotope compositions of polycyclic aromatic hydrocarbons （PAHs） in the atmospheric particles of the urban area of Urumchi were determined using GC/C/irMS. The δ^13C values of PAHs in the atmospheric particle of Urumchi City was -23.5‰-31.3‰, The ^13C content in the PAHs decreased with increasing of molecular weight. The contributions of coal combustion pollution source and motor discharge to benzo[a]pyrene, indeno[1,2,3-cd]pyrene, and benzo[ghi] perylene in the Urumchi urban area source 28%, 3% and 5% respectively for the motor discharge and 72%, 97% and 95% for the coal combustion. The opposite content of three kinds of compounds were 2.8%, 29.1% and 25.1%, respectively, occupying 57.0% of PAHs, total amount 78.6% was the distribution calculated from coal combustion, which was near to the calculated result （84%） of PAHs source from coal combustion calculated with CMB model.