黄河兰州段多环芳烃生态风险的初步评价  

Preliminary assessment on ecological risk of polycyclic aromatic hydrocarbons at the Lanzhou section of the Yellow River

作　　者：董继元[1] 王式功[2,3] 尚可政[2,3] 

机构地区：[1]兰州大学资源环境学院,兰州730000 [2]兰州大学半干旱气候变化教育部重点实验室,兰州730000 [3]兰州大学大气科学学院,兰州730000

出　　处：《干旱区资源与环境》2011年第4期50-55,共6页Journal of Arid Land Resources and Environment

基　　金：国家自然科学基金(40675077);国家"十一五"科技支撑计划项目(2007BAC03A10);(2008BAC40B04-6)资助

摘　　要：以黄河兰州段11个不同采样点3种多环芳烃的监测浓度及其对6～38种水生生物的LC50为基础资料,分别应用商值法、概率密度函数重叠面积和联合概率曲线3种风险评价方法对黄河兰州段苯并(a)芘、荧蒽、芘的生态风险进行了评价。结果表明:黄河兰州段3种PAHs残留具有一定的生态风险。其中低暴露风险条件下(受威胁生物不超过1%),苯并(a)芘的风险性较大,荧蒽次之,芘风险相对较低。反之,在较高风险区间(约3%以上生物受到危害),危害化合物的影响大小顺序为:芘>苯并(a)芘>荧蒽。通过对不同方法及评价结果的分析表明,联合概率曲线方法更适合于黄河兰州段PAHs的风险表征。Based on the observed concentrations of Polycyclic Aromatic Hydrocarbons in 11 surface water samples from the Lanzhou reach of the Yellow River and LC50 values of 6~38 of aquatic organisms,the quotient method and two probabilistic risk approaches were applied to characterize the ecological risks of benzo[a]pyrene,fluoranthene,and pyrene in water from the Lanzhou reach of the Yellow River.The results indicated that three residual PAHs have some ecological risk.While at the lower exposure level（percent of species affected less than 1%）,ecological risk of benzo（a）pyrene is the highest and that of pyrene is the lowest.Conversely,at the higher exposure level（percent of species affected more than 3%）,The ecological risk of 3 individual PAHs follow the order of pyrene 〉benzo[a]pyrene 〉fluoranthene.In addition,comparing the results among the three approaches,the joint probability curve is the most appropriate method for risk characterization of PAHs in the Lanzhou reach of the Yellow River.

关 键 词：黄河 多环芳烃 生态风险 商值法 概率风险评价 

分 类 号：X52[环境科学与工程—环境工程]