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 ¹⁴C-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.

中文翻译：

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Meta在土壤中对2,2'，4,4'-四溴联苯醚（BDE47）的积累和转化。

2,2'，4,4'-四溴联苯醚（BDE47）是一种阻燃剂多溴联苯醚（PBDEs）的同源物，在土壤饲养动物中的积累和转化仍是未知的。使用放射性示踪剂，我们在存在和不存在食地性Meta寻常型的情况下，在土壤中孵育¹⁴ C标记的BDE47 21天。BDE47主要通过口腔摄入土壤而在worm中积累，在培养结束时其放射性的生物-土壤积累因子（BSAF）值为1.3，且主要位于肠中，其次是小肠（器官区）和皮肤.。积累伴随着土壤孔隙水中BDE47浓度的显着降低和土壤中BDE47的矿化。BDE47在worm肠中转化为两种代谢物，其极性比BDE47高。该结果首次为食盐性earth中低溴化多溴二苯醚同源物的积累和转化提供了见识，有助于多溴二苯醚的环境风险评估。