珠江三角洲及南海北部海域表层沉积物中多溴联苯醚的分布特征

Polybrominated diphenyl ethers (PBDEs) in surficial sediments of the Pearl River Delta and adjacent South China Sea

自珠江三角洲和南海北部海域采集了66个表层沉积物样品,以研究该区域中PBDEs的含量、分布、来源和在环境中的迁移.研究结果表明,东江和珠江是PBDEs的高污染区,含量为12.7～7361ng·g-1,其中BDE209平均含量为1199ng·g-1,是目前世界上已报道沉积物中含量最高的区域之一.在几乎所有被分析的样品中BDE209都是最主要的同系物.东江和珠江的PBDEs主要来自东莞和广州的本地排放,而西江的PBDEs主要通过大气的传播输入.另一个高污染区澳门水域被验证是珠江三角洲水体环境中有机污染物的“汇”.

Sixty-six surficial sediment samples were collected from the Pearl River Delta and South China Sea and analyzed to acquire information about the distribution, sources and transport of polybrominated diphenyl ethers （PBDEs） in the aquatic environment. The results showed that the Dongliang and Zhujiang rivers were heavily contaminated, with total PBDE concentrations ranging from 12.7 to 7361 ng·g^-1 . BDE209 was the predominant congener almost in all the samples with an average concentration of 1199 ng·g^-1, one of the highest concentrations ever reported worldwide. The results also indicated that PBDEs in the Dongiang and Zhujiang rivers were originated from local sources ; however, atmospheric transport was the major input route for PBDEs present in the Xijiang River. The coastal region off Macao was found to serve as a sink of PBDEs for discharge from the Pearl River Delta, consistent with previous findings.