摘要
The aim of this research was to determine the residues of dioxins and dioxin-like polychlorinated biphenyls in cultured eel and find out the source of pollution and the distribution pattern of eels.One hundred samples of eel,4 fodder samples,and 12 environmental samples(water,plants,and soil)were collected from 4 cities and counties in Jiangxi Province,China.The contents of 17 kinds of dioxins(PCDD/Fs)and 12 kinds of dioxin-like polychlorinated biphenyls(dl-PCBs)were determined by high-resolution gas chromatography-tandem mass spectrometry,and the exposure risk was evaluated by using risk index.The total toxicity equivalence quantity(TEQ)of dioxin and dioxin-like polychlorinated biphenyls in eel and fodder samples collected in the study area were 0.65±0.31 pg/g and 0.10±0.02 pg/g,respectively.Dl-PCBs were the main dioxin pollution in eel and fodder samples.2,3’,4,4’,5-pentachlorodiphenyl and 2,3,3’,4,4’-pentachlorobiphenyl were the main contributing monomers.The environmental samples were mainly polluted by polychlorinated dibenzo-p-dioxins(PCDDs),with the main contributing monomer being Octachlorodibenzodioxins(OCDD),while 3,3’,4,4’,5-pentachlorobiphenyl and 2,3,4,7,8-pentachlorodibenzofuran were the main toxic compounds in eel and fodder.The dioxin pollution of eels cultured in Jiangxi Province was mainly from fodder polluted via dl-PCBs.The meat segment VI(tail)exhibited a strong enrichment effect of polychlorinated benzofurans(PCDFs).It should be the key part for dioxins and dioxin-like polychlorinated biphenyls assessment.Further,the results were helpful to improve the edible safety of eel products and the efficiency of the risk assessment of dioxins and dioxin-like polychlorinated biphenyls in fish.
基金
supported by the Ministry of Agriculture and Rural Affairs Agricultural Product Quality and Safety Supervision(Risk Assessment)Special Project:NZF[2019]No.10
the Natural Science Foundation of Liaoning Province(2021-BS-228).
