天津地区地表水中多环芳烃的生态风险  

Ecological risk assessment of polycyclic aromatic hydrocarbons in surface water from Tianjin

作　　者：石璇[1] 杨宇[1] 徐福留[1] 刘文新[1] 陶澍[1] 

机构地区：[1]北京大学环境学院地表过程分析与模拟教育部重点实验室,北京100871

出　　处：《环境科学学报》2004年第4期619-624,共6页Acta Scientiae Circumstantiae

基　　金：北京大学君政基金;国家自然科学基金(40332015;40024101)

摘　　要：以天津地区46个水样中8种多环芳烃的监测浓度及其对6至38种水生生物的LC50为基础资料,用重叠面积和联合概率曲线两种概率风险评价的方法分析这些多环芳烃的相对生态风险.结果表明,所研究的化合物中蒽的风险最大.进一步,基于"等效系数"概念,计算各样点多环芳烃的等效总浓度,用概率风险评价方法分析了8种多环芳烃联合作用的总生态风险,并与风险商结果对比.结果显示,总生态风险显著高于任一多环芳烃的单独作用.计算采用的两种剂量 效应关系的不同假设对最终结果影响不大.Based on the observed concentrations of 46 surface water samples from Tianjin and LC50 values of a number of aquatic organisms, probabilistic risk approach was applied to address ecological risk of 8 PAHs to local aquatic ecosystem. Both joint probability curve and overlapping area of concentration and toxicity distribution were calculated for this purpose. The results indicated that the ecological risk of the individual PAHs was small with anthracene being the most toxic compound. The joint probability risk of the 8 PAHs was calculated based on the sum of equivalent concentrations derived from calculated equivalence factors and compared with conventional approach of hazard quotient. The joint risk was much higher than that of the individual compounds. The calculated risk was slightly influenced by the type of doseresponse relationships.

关 键 词：天津 地表水 多环芳烃 生态风险 水生生物 风险评价 

分 类 号：X824[环境科学与工程—环境工程]