Institute of Environmental Pollution and Health, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China.
Institute of Environmental Pollution and Health, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China.
Chemosphere. 2015 Aug;133:22-30. doi: 10.1016/j.chemosphere.2015.02.064. Epub 2015 Mar 31.
Fifty-two PBDE congeners in river sediments from Shanghai were analyzed in the present study. The concentrations of Σ51PBDEs (defined as the sum of 51 BDE congeners except BDE209) and BDE209 ranged from 0.231 to 119 ng g(-1) and from nd to 189 ng g(-1), respectively. The most abundant BDE congeners in surface sediments were BDE118, 207, 208, 99, 49, 75, 47, 71 and 209, with median values of 1.67, 1.81, 1.83, 1.87, 1.98, 2.52, 2.73, 4.62 and 45.7 ng g(-1) dw, respectively. The concentrations of Σ52PBDEs were significantly correlated with total organic carbon (TOC) content in sediments (p < 0.05). Weak correlations between all PBDE homologues and TOC (r < 0.32) suggest that TOC had a little influence on sediment PBDE transport and distribution patterns in river sediments of Shanghai. Correspondence analysis (CA) showed that PBDEs in sediments in the studied area originated from commercial BDE formulations, combustion emission sources, and debromination of highly brominated PBDEs by aerobic/anaerobic microbes or sunlight. Risk assessment based on risk quotients (RQ) showed that PBDEs in all river sediments collected from Shanghai posed a high potential ecological risk (RQ > 1) to the sediment dwelling organisms, and pentaBDE, decaBDE and tetraBDE were the major ecological risk drivers.
本研究分析了上海河流沉积物中的 52 种多溴二苯醚同系物。Σ51PBDEs（定义为除 BDE209 以外的 51 种 BDE 同系物的总和）和 BDE209 的浓度范围分别为 0.231 至 119ng/g 和 nd 至 189ng/g。表层沉积物中最丰富的 BDE 同系物为 BDE118、207、208、99、49、75、47、71 和 209，中位数分别为 1.67、1.81、1.83、1.87、1.98、2.52、2.73、4.62 和 45.7ng/g。Σ52PBDEs 的浓度与沉积物中的总有机碳（TOC）含量呈显著相关（p<0.05）。所有 PBDE 同系物与 TOC 之间的弱相关性（r<0.32）表明 TOC 对上海河流沉积物中 PBDE 的迁移和分布模式影响不大。对应分析（CA）表明，研究区域沉积物中的 PBDE 来源于商用 BDE 制剂、燃烧排放源以及好氧/厌氧微生物或阳光对高溴化 PBDE 的脱溴作用。基于风险商数（RQ）的风险评估表明，上海所有河流沉积物中的 PBDE 对底栖生物具有很高的潜在生态风险（RQ>1），五溴、十溴和四溴是主要的生态风险驱动因素。
