汾河表层沉积物PCBs和OCPs含量、来源及生态风险

利用GC-ECD方法测定了汾河太原段30个表层沉积物样品中多氯联苯(PCBs)和有机氯农药(OCPs)的含量,同时对沉积物中PCBs和OCPs的来源和生态风险进行了研究.结果表明,研究区PCBs和OCPs的含量分别为n.d.~50.95μg/kg和2.19 ~25.24μg/kg.Aroclor检出率最高为Aroclor1260和Aroclor1254,这可能与我国主要生产和使用的PCB有关.OCPs中p,p￠-DDE含量占优势,研究区HCH和DDT来源于工业和农业输入.生态风险评价结果表明,γ-HCH、DDT(total),o,p￠+p,p￠-DDT,p,p￠-DDE,七氯环氧化物,PCBs总量可能会对研究区水生生态环境造成潜在影响,但整体风险水平不高.

Polychlorinated biphenyl and organochlorine pesticides in surface sediments of Fenhe River: The concentration,sources and ecological risk.

Concentration of polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs) were determined with GC-ECD in thirty surface sediment samples collected from Fenhe River in Taiyuan, while the pollution sources and ecological risk were studied. The results indicated that the total concentrations of PCBs and OCPs in sediment ranged from n.d.~50.95μg/kg and 2.19 ~25.24μg/kg, respectively. For PCBs, Aroclor1260 and Aroclor1254 were predominant isomers, which might be related to PCBs production and use of history in China. For OCPs, p,p￠-DDE were predominant congeners. Hexachlorocyclohexane (HCH) and dichlorodiphenytrichloroethanes (DDT) originated from industrial and agricultural usage. Ecological risk assessment of sediment indicated that sediments in Fenhe River were not constituted a serious threat to the ecological system, but γ-HCH, totle DDT, o,p￠+p,p￠-DDT, p,p￠-DDE, Heptachlor-exo-epoxide and totle PCBs likely to pose potential biological adverse impact.