| 典型污染区河流表层沉积物中PAHs的分布、来源及生态风险 |
| 摘要点击 2425 全文点击 2130 投稿时间：2009-03-03 修订日期：2009-07-19 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 沉积物 多环芳烃 来源 生态风险 |
| 英文关键词 sediments polycyclic aromatic hydrocarbons(PAHs) source ecological risk |
|
| 中文摘要 |
| 利用同位素稀释气相色谱-质谱(GC/MS)联用技术定量分析了台州市路桥区37个河流沉积物样品中16种优控PAHs的浓度，并对其分布特征、来源及生态风险进行评价. 结果表明，沉积物中16种PAHs的检出率均为100%，其总含量（∑PAHs）范围为59.3～3 180 μg/kg，平均值为722 μg/kg，与国内外同类研究相比处于中低程度污染水平；∑PAHs与有机碳（TOC）显著相关（r=0.699，p<0.001），表明TOC是影响沉积物中PAHs污染水平和归趋的重要因素之一．同分异构体比值和因子分析表明，路桥沉积物中PAHs来源于混合源，其中燃烧源占优势．有6个采样点的平均ERL商值>1，表明路桥部分采样点存在一定的生态风险；沉积物样品中PAHs的毒性当量浓度（TE>QBaP）介于3.41～485 μg/kg之间，7种致癌性PAHs对TEQBaP的贡献为98.4%，是生态风险的主要影响因素. |
| 英文摘要 |
| The concentrations of 16 US EPA PAHs in 37 sediment samples collected from Luqiao were analyzed by isotope dilution gas chromatograph/mass spectrometer (GC/MS)，and their distribution characters，sources and ecological risk were further investigated．Each of the 16 PAHs could be detected in all of the sediment samples，the total concentrations of the 16 PAHs in the sediments ranged from 59.3 μg/kg to 3 180μg/kg，with a mean of 722 μg/kg. The pollution level of PAHs can be categorized as low to moderate when compared with other studies around the world．∑PAHs were significantly correlated with TOC (r=0.699,p<0.001)，indicating that TOC was a key soil property affecting the level and fate of PAHs in sediments．The isomeric ratios and factor analysis revealed that PAHs in the Luqiao sediments were originated from mixed sources，and combustion source was dominant．Six sampling sites had the mean PAH ERL quotient>1，indicating that some sediments in Luqiao may have potential ecological risk．The toxic benzo [a] pyrene equivalents (TEQBaP) of the 16 PAHs ranged from 3.41 μg/kg to 485 μg/kg，98.4% of which was contributed by 7 carcinogenic PAHs，indicating that 7 PAHs were the main influential factors to the ecological risk. |
