Abstract：
Due to the characteristics of persistent organic pollutants (POPs), some legacy brominated flame retardants (LBFRs) were prohibited from use, and then gradually replaced by novel brominated flame retardants (NBFRs). However, till now little research focused on the effects of NBFRs on the benthos. In the present study, 0.5, 5, and 50 mg/kg dw of pentabromotoluene (PBT), hexabromobenzene (HBB), 1,2-bis(2,4,6-tribromophenoxy) ethane (BTBPE), decabromodiphenyl ethane (DBDPE) and decabromodiphenyl ether (BDE209) were added into sediments to test freshwater clams (Corbicula fluminea). In the 35-day exposure experiment, C. fluminea had different enrichment behaviors in three treatment groups. It was conjectured that in the lower dose group, the clams ingested contaminants and tended to be stable over time. While in higher dose groups, the clams were induced by the chemicals, leading to the changes in physiological activities so that the concentrations showed a downward trend first and then went up. The half-lives of contaminants in freshwater clams were between 0.911 and 11.6 days. DBDPE showed stronger bioaccumulation ability than BDE209 in this study. Parabolic relationships were observed between log BSAF and log Kow values in clam tissues. Debromination, hydroxylation, and methoxylated products were detected. Additionally, the gill samples of C. fluminea exposed to 50 mg/kg dw of single substance were observed by scanning electron microscope (SEM), indicating that the adhesions, tissue hyperplasia, and messy cilia occurred on the surface. Our research potentially contributes to further evaluations of the environmental risks posed in sediments contaminated by PBT, HBB, BTBPE, DBDPE, and BDE209, particularly the benthic organisms.
摘要：
由于持久性有机污染物（POPs）的特性，一些传统的溴化阻燃剂（LBFR）被禁止使用，然后逐渐被新型溴化阻燃剂(NBFR)所取代。然而,到目前为止，很少有研究关注NBFR对底栖动物的影响。在本研究中,0.5、5和50mg/kgdw的五溴甲苯（PBT），六溴苯(HBB)1,2-双(2,4,6-三溴苯氧基)乙烷(BTBPE),将十溴二苯基乙烷（DBDPE）和十溴二苯醚（BDE209）添加到沉积物中以测试淡水clam（Corbiculafluminea）。在35天的暴露实验中，3个治疗组的氟木癣具有不同的富集行为。据推测，在低剂量组中，蛤类摄入污染物，并随着时间的推移趋于稳定。而在较高剂量组中，蛤仔是由化学物质诱导的，导致生理活动的变化，使浓度呈现先下降后上升的趋势。淡水蛤仔中污染物的半衰期在0.911至11.6天之间。在本研究中，DBDPE显示出比BDE209更强的生物积累能力。观察到蛤仔组织中对数BSAF和对数Kow值之间的抛物线关系。脱溴,羟基化,并检测到甲氧基化产物。此外,通过扫描电子显微镜（SEM）观察暴露于50mg/kgdw单一物质下的C.fluminia的g样品，表明粘连，组织增生,表面出现杂乱的纤毛。我们的研究可能有助于进一步评估PBT污染的沉积物中的环境风险，HBB,BTBPE,DBDPE,和BDE209，特别是底栖生物。
