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bioaccumulation,Depuration and Biotransformation of 4,4'-dibromodiphenyl ether(BDE 15) in freshwater fish Crucian carp(Carassius auratus)

Bioaccumulation,Depuration and Biotransformation of 4,4'-dib...

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中国毒理学会环境与生态毒理学专业委员会第二届学术研讨会暨中国环境科学学会环境标准与基准专业委员会2011年学术研讨会

作者： Jie Cheng,Zhigang Zhao,Mengnan Shen,Shixiang Gao~* State Key Laboratory of Pollution Control and Resource Reuse,School of the Environment,Nanjing University,Nanjing 210046,PR China

Polybrominated diphenyl ethers(PBDEs) are a class of flame retardants that known to have bioaccumulation and potential toxicity to *** PBDEs in animals have been studied in many previous researches,little is known about the single low brominated diphenylethers of their fate in the aquatic *** the present study,we investigated the tissue distribution,excretion, depuration,and potential biotransformed products of 4,4’-dibromodiphenyl ether(BDE 15) after water exposure using freshwater fish Crucian carp(Carassius auratus).Fish were exposed to BDE 15 at different concentrations for 50 days,followed by a 14-day depuration period,to examine the levels of BDE 15 in the muscle,gill,liver and gut content *** analyses,bioaccumulation parameters, such as rate constants of uptake(k) and depuration(k),and corresponding half-life(t) were also *** showed that obviously rapid uptake and elimination of BDE 15 by carps was observed in both treated groups,and BDE 15 was most concentrated in the gill and liver to reach the peak concentrations on day *** corresponding estimated bioconcentration factor(BCF) values obtained for liver and gill in the low-dose treatment(1.28×10 and 1.69×10 dry weight,respectively) were higher than for ***,five unknown compounds were detected as BDE 15 metabolites in the exposed fish,a novel finding which indicated that debromination of BDEs was not the only metabolic pathway observed in *** 4-bromodiphenyl ether and diphenyl ether, another three products were proposed tentatively as mono-OH-BDE 15,diOH-BDE 15 and bromophenol using GC/EI-MS/*** the best of our knowledge,it is the first indications for the oxidation metabolism products of PBDEs in vivo exposed freshwater *** results will be useful for determination of the origin of OH-PBDEs present in wild aquatic organisms.

关键词： BDE 15 bioaccumulation parameters metabolism OH-PBDEs Crucian carp

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