乌鲁木齐空气颗粒物中PAHs碳同位素组成及来源解析  

Analysis of the source and the composition of PAHs carbon isotope in atmospheric particles of Urumchi City

作　　者：彭林[1] 游燕[2] 朱坦[2] 白志鹏[2] 李剑[3] 冯银厂[2] 

机构地区：[1]太原理工大学山西省和教育部煤科学与技术重点实验室,山西太原030024 [2]南开大学环境科学与工程学院,天津300071 [3]中国石油勘探开发研究院廊坊分院,河北廊坊065007

出　　处：《中国环境科学》2006年第5期542-545,共4页China Environmental Science

基　　金：山西省自然科学基金资助项目(20051019);国家自然基金资助项目(20307006);太原理工大学创新基金资助项目(2004-2005)

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δ13C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)苝的贡献,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)苝的相对含量分别为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.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.

关 键 词：碳同位素 多环芳烃 空气颗粒物 乌鲁木齐 

分 类 号：X511[环境科学与工程—环境工程]