河北西大洋水库沉积物中多环芳烃的分布、来源及生态风险评价  

Distributions,sources and ecological risk assessment of polycyclic aromatic hydrocarbons in sediments from Xidayang Reservoir,Hebei Province

作　　者：赵健[1] 周怀东[2] 富国[1] 赵高峰[2] 陆瑾[2] 王雨春[2] 袁浩[2] 

机构地区：[1]中国环境科学研究院,北京100012 [2]中国水利水电科学研究院,北京100038

出　　处：《湖泊科学》2011年第5期701-707,共7页Journal of Lake Sciences

基　　金：国家水体污染控制与治理科技重大专项项目(2008ZX07209);国家自然科学基金项目(50721006)联合资助

摘　　要：分析了河北西大洋水库沉积物中16种多环芳烃的含量及分布状况,并对其来源和生态风险进行了分析和评估.结果表明,表层沉积物多环芳烃总含量范围在422.36-1052.90 ng/g之间,且由库区上游到坝前逐渐升高.水库剖面沉积物中多环芳烃总含量在388.81-1205.56 ng/g之间,自底层20 cm到表层多环芳烃呈上升的趋势.沉积物中多环芳烃组成以低环的萘和菲,高环的荧蒽、苯并[b]荧蒽、屈和芘为主.表层和剖面沉积物中多环芳烃总含量与有机碳含量呈正相关关系,相关系数分别为0.91和0.93;此外,有机碳对高环多环芳烃的影响更显著.西大洋水库沉积物中多环芳烃主要来源化石燃料及生物质的燃烧.总体来说,西大洋水库沉积物多环芳烃污染处于中等偏低污染水平,多环芳烃对生态环境的影响目前还处于较低风险水平.Polycyclic aromatic hydrocarbons（PAHs） of 16 types were measured in sediment from Xidayang Reservoir, Hebei Prov- ince, and the possible sources and potential risk assessment also had been analyzed. Total PAHs concentrations varied from 422.36 to 1052.90 ng/g in surface sediment, and increased continuously from reservoir upstream to the front areas of the reservoir dam. The total PAHs concentrations ranged from 388.81 to 1205.56 ng/g in a sediment profile, and increased continuously from the bottom（20cm under the surface ） to the surface sediment. Naphthalene, Phenanthrene, Fluoranthene, Benzo （b） fluoranthene, Chrysene and Pyrene were dominant compounds of PAHs in the sediment. The total PAHs concentration was positively correlated to TOC contents with a correlation coefficient of 0.91 in surface sediment and 0.93 in profile sediment. TOC absorbs more strongly high molecular weight PAHs（HPAHs） than low molecular weight PAHs（LPAHs ）. The main source of PAI-Is was originated from combustions of fossil fuels and biomass. In general, PAHs pollution in sediment appeared to be moderate to low leveling in Xidayang Reser- voir. Risk assessment suggested that PAHs was no significant biological impairment, suggesting a low toxicological risk up to now.

关 键 词：西大洋水库 沉积物 多环芳烃 分布 生态风险 

分 类 号：X524[环境科学与工程—环境工程] X13X820.4