长江重庆段沉积物中多环芳烃的分布及其来源  

Distribution and origin of polycyclic aromatic hydrocarbons in the sediments from Chongqing section of the Yangtze River

作　　者：杜娴[1] 罗固源[1] 许晓毅[1] 

机构地区：[1]重庆大学三峡库区生态环境教育部重点实验室,重庆400045

出　　处：《重庆大学学报（自然科学版）》2013年第5期80-85,共6页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(41101457);科技部国际科技合作项目(2007DFA90660)

摘　　要：对长江重庆段12个采样点枯水期和丰水期沉积物中多环芳烃(PAHs)的分析表明,枯水期PAHs含量为0.64～3.98μg/g,丰水期为0.85～4.63μg/g,其中菲(Phe)含量最高,占总量的11%～27%;PAHs组成集中在中环(3～5环),而低环(2环)和高环(6环)含量很少,组成随着采样时间不同存在着显著性差异,丰水期释放出更多高环PAHs。沉积物PAHs主要来源于植物、煤炭等燃料的不完全燃烧和来往船只的燃油泄漏;与其他地区相比,研究区PAHs含量处于中等水平,已有个别PAHs化合物(如芴Fle、菲Phe)超过生物毒性试验的可能效应浓度(PEL)标准,对该地区生态将构成一定的潜在危害。The analysis of PAHs in sediments of 12 sampling sites from Chongqing section of the Yangtze River shows that total PAHs concentration ranges from 0. 64 - 3. 98 ug/g in dry season and 0. 85 -4.63 ug/g in wet season, with the maximum content of phenanthrene accounting for 11% -27% of total PAHs. The 3-5 rings PAHs are dominant in sediment samples,while the content of PAHs with 2 and 6 benzene rings is small. Moreover, the compositions of PAHs are significantly different as they are taken from different sampling periods,releasing more 6-ring PAHs in rainy season. The combustion of fossil fuels and oil spillages of ships may be dominant sources in the study area and the degree of sediment contamination by PAHs is moderate in comparison with other internal and external sediments. However, fluorene and phenanthrene exceed the probable effect level （PEL） ,which might certain potential damage to the ecosystem in the studied area.

关 键 词：多环芳烃 沉积物 分布 来源 长江 

分 类 号：X131[环境科学与工程—环境科学]