新型溴化阻燃剂(NBFR)和脱氯烷(DP)已被广泛用作传统BFR的替代品。然而,对电子垃圾回收场所NBFR和DP污染的时间趋势知之甚少。在目前的研究中,从位于中国南方一个典型的电子废物回收场所的电子废物污染池塘中收集了三个复合沉积物芯,以调查NBFR和DP的历史发生和组成。在沉积物岩心的所有层中检测到NBFR和DP,浓度范围为5.71〜180,895和4.95〜109,847ng/gdw,分别。除2,3,5,6-四溴对二甲苯(pTBX)和2,3,4,5,6-五溴乙苯(PBEB)外,所有NBFR化合物和DP从底层到顶层都显示出明显的增加趋势。这些结果暗示NBFR和DP的长期和严重污染。十溴二苯基乙烷(DBDPE)是最丰富的NBFR,贡献比例为58±15%,73±15%,三个沉积物岩心为71±18%,其次是1,2-双(2,4,6-三溴苯氧基)乙烷(BTBPE)和五溴苯(HBB)。BTBPE/Octa-BDE和DBDPE/Deca-BDE的比率分别为0.12至60和0.03至0.49,随着沉积物深度的减少,没有明显的增加趋势。至于DP,沉积物岩心中的fanti值(anti-DP与syn-DP之和的浓度比)在0.41至0.83之间,几乎在DP技术产品中的范围内,表明沉积物岩心中没有发生DP降解。DBDPE的环境负担,BTBPE,HBB,PBT,PBEB,pTBX,和DP估计为34.0、5.67、10.1、0.02、0.02、0.01和34.8千克,分别。这项工作首次了解了电子垃圾回收场沉积物中NBFR和DP的历史污染状况。
Novel brominated flame retardants (NBFRs) and dechlorane plus (DP) have been widely used as alternatives to traditional BFRs. However, little is known about the temporal trends of NBFR and DP pollution in e-waste recycling sites. In the current study, three composite sediment cores were collected from an e-waste-polluted pond located in a typical e-waste recycling site in South China to investigate the historical occurrence and composition of NBFRs and DP. The NBFRs and DP were detected in all layers of the sediment cores with concentration ranges of 5.71~180,895 and 4.95~109,847 ng/g dw, respectively. Except for 2,3,5,6-tetrabromo-p-xylene (pTBX) and 2,3,4,5,6-pentabromoethylbenzene (PBEB), all the NBFR compounds and DP showed a clear increasing trend from the bottom to top layers. These results implied the long-term and severe contamination of NBFRs and DP. Decabromodiphenyl ethane (DBDPE) was the most abundant NBFR with the contribution proportions of 58 ± 15%, 73 ± 15%, and 71 ± 18% in three sediment cores, followed by 1,2-bis(2,4,6-tribromophenoxy) ethane (BTBPE) and pentabromobenzene (HBB). The ratios of BTBPE/Octa-BDEs and DBDPE/Deca-BDEs varied from 0.12 to 60 and from 0.03 to 0.49, respectively, which had no clear increase trends with a decrease in sediment depth. As for DP, the fanti values (the concentration ratios of anti-DP to the sum of anti-DP and syn-DP) in sediment cores ranged from 0.41 to 0.83, almost falling in the range of those in DP technical products, suggesting that DP degradation did not occur in sediment cores. The environmental burdens of DBDPE, BTBPE, HBB, PBT, PBEB, pTBX, and DP were estimated to be 34.0, 5.67, 10.1, 0.02, 0.02, 0.01, and 34.8 kg, respectively. This work provides the first insight into the historical contamination status of NBFRs and DP in the sediments of an e-waste recycling site.