富碳沉积物对多环芳烃的截存及其环境意义  

Sequestration of PAHs by carbonaceous sediments and its environmental significance

作　　者：付佳露[1] 杨毅[1] 晏彩霞[1] 彭欢[1] 刘敏[1] HOFMANN Thilo 

机构地区：[1]华东师范大学资源与环境学院教育部地理信息科学重点实验室,上海200062 [2]维也纳大学环境地学系

出　　处：《环境污染与防治》2010年第9期73-79,共7页Environmental Pollution & Control

基　　金：教育部博士点专项基金资助项目(No.20090076120022);上海市教委"晨光计划"资助项目(No.09CG19);南京大学污染控制与资源化研究国家重点实验室开放基金资助项目(No.PCRRF09012)

摘　　要：沉积物是多环芳烃(PAHs)等憎水性有机污染物的蓄积库,同时它也是该类污染物的源,沉积物中污染物的吸附/解吸,控制着污染物在水环境中的行为和生态毒性。然而,沉积物并不均一,沉积物中的异质组分表现出对PAHs差异显著的吸附/解吸性能。研究表明,富碳沉积物对PAHs存在截存效应,控制着污染物的吸附/解吸过程,表现为吸附/解吸滞后、缓慢解吸和受限的生物有效性。最后,在综述沉积物中的富碳物质及截存效应机制的基础上,讨论了截存效应所带来的环境意义和启示。Sediments is the sink of hydrophobicity organic pollutant such as PAHs,and it also act as the source of this kind of pollutant.Sorption/desorption of PAHs to/from sediments control the fate and ecotoxicity of these compounds in the aquatic system.However,sediments are not homogenized,in which heterogeneous geosorbents exhibit distinct sorption/desorption behavior.More and more studies found the sequestration of PAHs by sediments,the sequestration could control the sorption/desorption of these compounds from three aspects of sorption/desorption hysteresis,very slow desorption and restricted bioavailability.This paper reviews the carbonaceous georsobents and the three effects controlled by sequestration.Consequently,the environmental significance and implications are discussed herein.

关 键 词：截存效应 富碳沉积物 多环芳烃 

分 类 号：X50[环境科学与工程—环境工程]