[Distribution characteristic of organochlorine pesticides and polybrominated diphenyl ethers in tissues of ducks from Baiyangdian Lake, North China].

The concentrations of hexachlorocyclohexane(HCHs),dichlorodiphenyltrichloroethane(DDTs),and polybrominated diphenyl ethers(PBDEs) in muscle,liver and brain of ducks from Baiyangdian Lake were determined by gas chromatography coupled with mass spectrometer(GC /MS).The results showed that the concentrations of HCHs,DDTs and PBDEs in various tissues of ducks were in the range of 0.9-5.0 ng /g wet weight(WW),0.3-2.8 ng /g(WW) and 0.03-0.65 ng /g(WW),respectively.Statistical analysis indicated that the accumulation of DDTs and PBDEs in muscle,liver and brain was significantly different(p 0.05),but not with HCHs(p 0.05).Liver tissues contained the highest DDTs and PBDEs levels,with average concentrations of 2.3 ng /g(WW) and 0.37 ng /g(WW),respectively.Among the HCH isomers and DDT metabolites,β-HCH was the predominant isomers in liver and brain tissues,and p,p′-DDE was the dominant metabolites of DDTs in various tissues.Among the PBDE congeners,BDE47 and BDE99 were the predominant in various tissues.The different profiles of persistent organohalogen compounds in various tissues of ducks may reflect that the Baiyangdian Lake still subject to the contamination of historically residue for HCHs and DDTs.In addition,the source of PBDEs was partly attributed to the industrial pollution,chemical plants,and sewage discharging.