Bioaccumulation, maternal transfer and elimination of polybrominated diphenyl ethers in wild frogs |
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Authors: | Liu Peng-Yan Du Guo-Dong Zhao Ya-Xian Mu Yun-Song Zhang Ai-Qian Qin Zhan-Fen Zhang Xiao-You Yan Shi-Shuai Li Yan Wei Rong-Guo Qin Xiao-Fei Yang Yong-Jian |
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Affiliation: | a College of Chemistry and Environmental Science, Hebei University, Baoding, Hebei, China b State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing, China c Taizhou No.1 Middle School, Taizhou City, Zhejiang Province, China |
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Abstract: | To investigate bioaccumulation, maternal transfer and elimination of polybrominated diphenyl ethers (PBDEs) in amphibians, we collected adult frogs (Rana limnocharis) from a rice field in an e-waste recycling site in China. We found that ∑PBDEs in the whole frogs and various tissues (brain, liver, testis and egg) ranged from 17.10 to 141.11 ng g−1 wet weight. Various tissues exhibited a similar PBDE congener profile, which was characterized by intermediate brominated congeners (BDE-99 and BDE-153) as the largest contributors, with less lower brominated congeners (BDE-28 and BDE-47) and higher brominated congeners (BDE-209). The maternal transfer capacity of PBDEs declined with the increase in bromine numbers of PBDE congeners. We suggest that the bromine atom number (the molecular size, to some degree) might be a determining factor for the maternal transport of a PBDE congener rather than Kow (Octanol-Water partition coefficient), which expresses a compound’s lipophilicity. ∑PBDEs concentrations in frogs decreased over time during a depuration period of 54 days when these wild frogs were brought to the lab from the e-waste recycling site. The half-life of ∑PBDEs was 35 days, with about 14 days for BDE-47, and 36 and 81 days for BDE-99 and BDE-153, respectively. The data shows that the elimination of PBDEs has no essential difference from aquatic and terrestrial species. |
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Keywords: | Polybrominated diphenyl ethers Frog Bioaccumulation Maternal transfer Elimination |
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