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Abstract：
Abundant use of plastic materials has increased the amount of microplastics (MPs) and related hazardous chemicals in the marine environment. Hexabromocyclododecanes (HBCDs), brominated flame retardants added to expanded polystyrene (EPS), have been detected in biotic and abiotic samples. In this study, the partition constants of HBCDs between plastics and seawater (KPsw) were determined. Fugacities of HBCDs in EPS, seawater, sediment, and mussels were obtained to determine the directions of the diffusive flux. The fugacities in EPS (fEPS) were greater than those in seawater (fsw), sediment (fsed), and mussels (fswmussel-EPS and fmussel-rock) by three orders of magnitude, indicating that EPS plastics are a significant source of HBCDs. The fmussel-rock of α-HBCD in rock mussels was greater than fsw by factors of 1.7, whereas the fmussel-rock of γ-HBCD was smaller than fsw by factors of 16, indicating the bioisomerization from γ-to α-HBCD. The relatively constant concentration ratio of β-HBCD to the total HBCDs indicated that β-HBCD is a sufficient tracer for determining the diffusive flux. The fsed values of HBCDs were greater than fsw by factors of 17-28, implying a probable advective vertical flow of HBCDs from the EPS plastics, which requires further investigation.
摘要：
塑料材料的大量使用增加了海洋环境中的微塑料（MP）和相关危险化学品的数量。六溴环十二烷(HBCDs),溴化阻燃剂添加到发泡聚苯乙烯（EPS），已在生物和非生物样品中检测到。在这项研究中,确定了HBCD在塑料和海水之间的分配常数（KPsw）。六溴环十二烷在EPS中的重要性，海水,沉积物,并获得贻贝以确定扩散通量的方向。EPS(fEPS)中的逸度大于海水(fsw)中的逸度,沉积物(fsed)，和贻贝（fswmussel-EPS和fmussel-rock）三个数量级，表明EPS塑料是六溴环十二烷的重要来源。贻贝中α-六溴环十二烷的岩比fsw大1.7倍，而γ-六溴环十二烷的岩比fsw小16倍，表明从γ-到α-六溴环十二烷的生物异构化。β-HBCD与总HBCD的相对恒定的浓度比表明，β-HBCD是确定扩散通量的足够示踪剂。六溴环十二烷的fsed值大于fsw的17-28倍，这意味着六溴环十二烷可能从EPS塑料中垂直对流流动，这需要进一步调查。
