中文关键词香溪河库湾多环芳烃土壤时空分布来源风险评价 英文关键词Xiangxi Baypolycyclic aromatic hydrocarbonssoiltemporal-spatial distributionsourcerisk assessment

作者	单位	E-mail
黄应平	三峡大学水利与环境学院, 宜昌 443002 三峡库区生态环境教育部工程研究中心, 宜昌 443002	chem_ctgu@126.com
金蕾	三峡大学水利与环境学院, 宜昌 443002 三峡库区生态环境教育部工程研究中心, 宜昌 443002
朱灿	三峡大学水利与环境学院, 宜昌 443002 三峡库区生态环境教育部工程研究中心, 宜昌 443002
李锟	三峡大学水利与环境学院, 宜昌 443002 三峡库区生态环境教育部工程研究中心, 宜昌 443002
谢平	三峡大学水利与环境学院, 宜昌 443002 三峡库区生态环境教育部工程研究中心, 宜昌 443002
David Johnson	三峡库区生态环境教育部工程研究中心, 宜昌 443002 三峡大学生物与制药学院, 宜昌 443002
刘慧刚	三峡库区生态环境教育部工程研究中心, 宜昌 443002
席颖	三峡大学水利与环境学院, 宜昌 443002 三峡库区生态环境教育部工程研究中心, 宜昌 443002	hellox-y@163.com

中文摘要 为了全面评价三峡库区土壤多环芳烃（polycyclic aromatic hydrocarbons，PAHs）环境行为，以香溪河库湾不同淹没类型土壤［消落带上缘（>175 m）、消落带（145~175 m）和沉积物（<145 m）］为研究对象，通过高效液相色谱检测方法，分析3个区域土壤16种美国环保署优先控制的PAHs含量.结果表明，香溪河库湾土壤PAHs总量表现为消落带上缘>消落带>沉积物，沉积物PAHs以3环和4环为主，而消落带及其上缘土壤PAHs以4环和5环为主，其中消落带土壤PAHs变异系数相对最高，与其它两个区域PAHs组成之间的相关性相对较弱.各区域土壤PAHs分布呈现季节差异，夏季和冬季土壤PAHs含量相对较高，主要与库区各季节居民能源消费类型有关；空间分布特征表现为，沉积物PAHs空间分布整体较为均匀，而消落带及其上缘土壤PAHs在峡口镇和长江入江口处PAHs含量相对较高，主要与空间水平上各样点频繁的人类活动有关.PAHs异构体比值法分析表明，香溪河库湾各区域土壤PAHs来源具有季节性差异，化石燃料和生物质的不完全燃烧是消落带土壤PAHs的主要来源；终身致癌风险评价模型分析表明，土壤PAHs通过误食和皮肤接触暴露途径对人体健康产生潜在致癌风险，并且消落带上缘土壤PAHs致癌风险相对较大.研究结果扩展了对香溪河库湾土壤PAHs环境行为的认识，为三峡库区香溪河库湾土壤PAHs污染防治提供有益参考. 英文摘要 The US Environmental Protection Agency has listed 16 polycyclic aromatic hydrocarbons (PAHs) for priority control. Soil samples from Xiangxi Bay in the Three Gorges Reservoir Area (the water fluctuation zone, WLFZ; upper edge of water fluctuation zone, UEWLFZ; sediments) were analyzed for the concentration of these PAHs, using high performance liquid chromatography (HPLC). The results showed that the soil samples of Xiangxi Bay could be ranked, based on the concentration of PAHs, in the following order:UEWLFZ>WLFZ>sediment. The composition of PAHs varied from the three regions, with 3- and 4-ring PAHs dominating in sediments and 4- and 5-ring PAHs dominating in soil from the WLFZ and UEWLFZ. The composition of PAHs in soil from the WLFZ exhibited a higher coefficient of variation and a weaker correlation with the composition of PAHs in soil from the UEWLFZ and sediment. Soil from the three regions showed varying seasonal distributions of PAHs, which is closely related to the quantity and types of energy consumption in each season. PAHs in sediment from sites at the same altitude showed no evident differences, whereas WLFZ and UEWLFZ soil had higher levels of PAHs at the sites near Xiakou Town and the Yangtze River Estuary. Isomer ratio analysis showed that the sources of PAHs in Xiangxi Bay vary between seasons and regions, with incomplete combustion of fossil fuels and biomass forming the main sources in the soil of Xiangxi Bay. The lifetime carcinogenic risk assessment shows that PAHs in sediment, WLFZ, and UEWLFZ have a potential risk to human through ingestion and dermal contact, with PAHs in the soil of UEWLFZ posing the highest carcinogenic risk. The results provide a theoretical reference for the prevention and control of contamination by PAHs in Xiangxi Bay of the Three Gorges Reservoir area.

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