Distribution and sources of polybrominated diphenyl ethers in surface sediments of Lake Chaohu

在巢湖不同区域采集了16个表层沉积物样品，利用气相色谱质谱仪测定沉积物中低溴代多溴联苯醚（_LPBDEs）和BDE209的含量，并对其残留、组成、空间分布和污染来源进行分析.结果表明，巢湖沉积物中共计检测到9种多溴联苯醚（PBDEs）化合物.∑_LPBDEs的含量为0.001~2.75 ng/g，平均值为1.15 ng/g，平均检测率为44.83%；BDE209的含量为1.16~5.49 ng/g，平均值为2.83 ng/g，检测率为100%.与国内其他区域相比，巢湖沉积物中PBDEs含量总体处于中等水平.巢湖沉积物中各类_LPBDEs和BDE209同系物含量为：西半湖 > 东半湖 > 湖心.巢湖沉积物中PBDEs以BDE209为主要成分，不同采样点PBDEs同系物的组成不同.相关性分析表明BDE209与_LPBDEs在环境中的迁移存在相关性.;16 surface sediments were collected from Lake Chaohu. Low brominated polybrominated diphenyl ethers (_LPBDEs) and BDE209 were measured by gas chromatography/mass spectrometry (GC/MS). The distributions, composition and sources of PBDEs were investigated. Results show that 9 PBDEs are detected. ∑_LPBDEs are in the range of 0.001 to 2.75 ng/g and 1.16 to 5.49 ng/g, with the average of 1.15 and 2.83 ng/g, respectively. Compared with the other estuarine and coastal regions in China, PBDEs contents in Lake Chaohu are in the middle level. The spatial distribution of _LPBDEs and BDE209 contents follow the sequence of western half-lake > eastern half-lake > lake-central. BDE209 is the main component of PBDEs in the sediments of Lake Chaohu. In addition, the compositions of PBDEs homologues are different at different sampling sites. PBDEs are mainly derived from decabromodiphenyl ether. Correlation analysis show that there is a migration correlation between BDE209 and _LPBDEs in the environment.