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首页> 外文期刊>Environmental Science & Technology >Distribution of polybrominated diphenyl ethers in sediments of the Pearl River Delta and adjacent South China Sea
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Distribution of polybrominated diphenyl ethers in sediments of the Pearl River Delta and adjacent South China Sea

机译：多溴联苯醚在珠江三角洲及南海附近沉积物中的分布

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摘要

Spatial and temporal distributions of polybrominated diphenyl ethers (PBDEs) in sediments of the Pearl River Delta (PRD) and adjacent South China Sea (SCS) of southern China were examined. A total of 66 surface sediment samples were collected and analyzed to determine the concentrations of 10 PBDE congeners (BDE-28,-47,-66, -100, -99, -154, -153, -138, -183, and -209). The concentrations of BDE-209 and Y-PBDEs (defined as the sum of all targeted PBDE congeners except for BDE-209) ranged from 0.4 to 7340 and from 0.04 to 94.7 ng/g, respectively. The Sigma PBDEs concentrations were mostly < 50 ng/g, within the range for riverine and coastal sediments around the world, whereas the BDE-209 concentrations at the most contaminated sites were at the high end of the worldwide figures. Congener compositions were dominated by BDE-209 (72.6-99.7%), with minor contributions from penta- and octa-BDEs. Slightly different PBDE compositions were observed among samples collected from different locations, attributable to possible decomposition of highly brominated congeners and/or redistribution between particles of various sizes during atmospheric or fluvial transportation. The PBDE patterns in the SCS and Pearl River Estuary sediments were similar to those in sediments of the Zhujiang and Dongjiang Rivers, reflecting the widespread influence from local inputs. Analyses of two short sediment cores collected from the Pearl River Estuary showed that concentrations of BDE-209 rapidly increased in the upper layers of both cores, coincident with the growth of the electronics manufacturing capacities in the PRD region. The major sources of PBDEs were probably waste discharges from the cities of Guangzhou, Dongguan, and Shenzhen, the three fastest growing urban centers in the PRD.
机译：研究了珠江三角洲（PRD）和中国南部邻近南海（SCS）沉积物中多溴联苯醚（PBDEs）的时空分布。总共收集并分析了66个表面沉积物样品，以确定10种多溴二苯醚同类物的浓度（BDE-28，-47，-66，-100，-99，-154，-153，-138，-183和- 209）。 BDE-209和Y-PBDEs的浓度（定义为除BDE-209外的所有目标PBDE同系物的总和）分别为0.4至7340和0.04至94.7 ng / g。在世界范围内河流和沿海沉积物的范围内，Sigma PBDEs的浓度大多<50 ng / g，而在受污染最严重的地点，BDE-209的浓度处于全球最高水平。 BDE-209（72.6-99.7％）占了同类，而五溴和八溴二苯醚的贡献很小。在从不同位置收集的样品中观察到的PBDE组成略有不同，这归因于在大气或河流运输过程中高溴化同类物的可能分解和/或各种尺寸的颗粒之间的重新分布。南海和珠江口沉积物中的多溴二苯醚模式与珠江和东江沉积物中的多溴二苯醚模式相似，反映了当地投入的广泛影响。对从珠江口收集的两个短沉积岩心的分析表明，两个岩心的上层中BDE-209的浓度迅速增加，与珠三角地区电子制造能力的增长相吻合。多溴二苯醚的主要来源可能是从珠三角地区增长最快的三个城市中心广州，东莞和深圳等城市排出的废物。

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