湖泊沉积柱中的高溴联苯醚及其在环境中的降解  

Highly Brominated Polybrominated Diphenyl Ethers in Lake Sediment Cores and Their Potential Environmental Degradation

作　　者：张亮[1,2,3] 郭建阳[2] 廖海清[3] 汤智[3] 

机构地区：[1]中国科学院地球化学研究所,环境地球化学国家重点实验室,贵州贵阳550002 [2]内蒙古科技大学能源与环境学院,内蒙古包头014030 [3]中国环境科学研究院,环境基准与风险评估国家重点实验室,国家环境保护湖泊污染控制重点实验室,北京100012

出　　处：《环境科学研究》2011年第9期988-994,共7页Research of Environmental Sciences

基　　金：国家自然科学基金项目(40973087);国家重点基础研究发展计划(973)项目(2008CB418200);中国科学院“西部博士资助项目”

摘　　要：采用GC/MS方法分析了5个内陆湖泊(巢湖、滇池、红枫湖、青海湖和四海龙湾)钻孔沉积物中HB-PBDEs(高溴联苯醚,包括九溴和十溴的联苯醚)的垂直分布状况,并对它们的组成特征及其在环境中的降解进行了分析.结果显示,5个内陆湖泊表层沉积物中有机碳归一化后的w(ΣHB-PBDEs)为17.5～977.9 ng/g,其中滇池、红枫湖和巢湖HB-PBDEs的污染相对较为严重;与国内外其他研究相比,我国内陆湖泊沉积物中BDE-209的污染状况相对较轻.沉积物中HB-PBDEs的组成特征显示,BDE-209不但在大气传输过程中发生了明显降解,而且在进入湖泊沉积物后也发生了明显降解.由于BDE-209在不同环境介质中都可发生降解,并且降解产物为毒性更大的低溴代单体,因此进一步研究BDE-209在环境中的降解具有重要意义.The vertical distribution of highly brominated polybrominated diphenyl ethers（HB-PBDEs,including nona-and deca-BDEs） in drilling sediments from five inland lakes（Lake Chaohu,Lake Dianchi,Lake Hongfeng,Lake Qinghai and a maar Lake Sihailongwan） were examined using GCMS method.The composition and potential environmental degradation of these compounds were also identified.The results indicated that TOC normalized total HB-PBDEs contents in the five surface sediments ranged from 17.5 to 977.9 ngg,with relatively high levels obtained from Dianchi,Hongfeng and Chaohu,which were still far less than reported data from other areas in China and developed countries.The composition of HB-PBDEs in these sediment cores suggested that considerable degradation of BDE-209 occurred not only during long-range atmospheric transport,but also in the lake sediments.Because BDE-209 can degrade to more toxic low brominated congeners in the environment,it is of great importance to further investigate the environmental degradation of BDE-209.

关 键 词：湖泊 沉积柱 多溴联苯醚 组成 降解 

分 类 号：X502[环境科学与工程—环境工程]