Laboratory of Organic Geochemistry, Tokyo University of Agriculture and Technology, 3-5-8, Saiwaicho, Fuchu, Tokyo 183-8509, Japan.
Akkeshi Marine Station, Field Science Center for Northern Biosphere, Hokkaido University, Akkeshi, Hokkaido 088-1113, Japan.
Mar Pollut Bull. 2024 Sep;206:116740. doi: 10.1016/j.marpolbul.2024.116740. Epub 2024 Jul 25.
Plastics can contain two types of organic contaminants; absorbed from ambient water, and already contained as additives. To investigate the bioaccumulation of these substances, we conducted two types of exposure experiments using mussels and polyethylene microplastics with absorbed PCBs and containing four types of additives (BDE209, DBDPE, UV327 and UV234). After dietary exposure for 15 days, significantly higher concentrations of total PCBs, UV327 and UV234 were detected in the gonad of exposed groups than in the control groups, respectively. However, no significant differences in BDE209 or DBDPE levels were observed between the control and exposure groups. Although a higher transfer ratio was shown for PCB congeners with octanol-water partition coefficients (logK) below 7, the ratio was lower for higher-hydrophobic PCBs with logK above 7. This suggests that higher hydrophobic compounds (not only highly chlorinated PCBs, but also BDE209 and DBDPE) tend not to desorb or leach from plastics.
一种是从周围水中吸收的，另一种是作为添加剂已经存在的。为了研究这些物质的生物累积，我们使用贻贝和含有已吸收 PCB 和四种添加剂（BDE209、DBDPE、UV327 和 UV234）的聚乙烯微塑料进行了两种类型的暴露实验。经过 15 天的饮食暴露后，暴露组贻贝性腺中总 PCB、UV327 和 UV234 的浓度明显高于对照组。然而，BDE209 或 DBDPE 水平在对照组和暴露组之间没有观察到显著差异。尽管具有低于 7 的辛醇-水分配系数（logK）的 PCB 同系物表现出更高的转移比，但 logK 高于 7 的更高疏水性 PCB 的比值较低。这表明，更高疏水性的化合物（不仅是高度氯化的 PCB，还有 BDE209 和 DBDPE）往往不易从塑料中解吸或浸出。
