State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Xianlin Avenue 163, Nanjing, 210023, China.
Institute for Ecopreneurship, School of Life Sciences, University of Applied Sciences and Arts Northwestern Switzerland, Hofackerstrasse 30, 4132, Muttenz, Switzerland.
Bull Environ Contam Toxicol. 2020 May;104(5):701-706. doi: 10.1007/s00128-020-02834-9. Epub 2020 Mar 31.
The accumulation and transformation of 2,2',4,4'-tetrabrominated diphenyl ether (BDE47), one congener of the flame retardants polybrominated diphenyl ethers (PBDEs), in soil-feeding fauna are still unknown. Using radioactivity tracer, we incubated C-labelled BDE47 in soil for 21 days in the presence and absence of the geophagous earthworm Metaphire vulgaris. BDE47 accumulated in the earthworm predominantly via oral ingestion of soil, giving a biota-soil accumulation factor (BSAF) value of 1.3 for radioactivity at the end of incubation, and was mostly located in intestine, followed by clitellum (organs region) and skin of earthworms. Accumulation was accompanied by significant decrease of BDE47 concentration in soil porewater and BDE47 mineralization in soil. BDE47 was transformed in the earthworm gut into two metabolites with higher polarities than BDE47. The results provide for the first time insights into accumulation and transformation of lower-brominated congeners of PBDEs in geophagous earthworms, being helpful for environmental risk assessment of PBDEs.
土壤摄食动物体内 2,2',4,4'-四溴二苯醚（BDE47），一种多溴二苯醚（PBDEs）阻燃剂同系物的积累和转化仍然未知。本研究使用放射性示踪剂，在存在和不存在食土蚯蚓（Metaphire vulgaris）的情况下，将 C 标记的 BDE47 在土壤中培养 21 天。BDE47 主要通过蚯蚓的口腔摄入土壤而积累，在培养结束时放射性的生物-土壤积累因子（BSAF）值为 1.3，并且主要位于蚯蚓的肠道中，其次是生殖带（器官区域）和皮肤。积累伴随着土壤孔隙水中 BDE47 浓度的显著下降和土壤中 BDE47 的矿化。BDE47 在蚯蚓肠道中转化为两种比 BDE47 极性更高的代谢物。这些结果首次提供了关于 PBDEs 低溴同系物在食土蚯蚓体内积累和转化的见解，有助于 PBDEs 的环境风险评估。
