| In recent years,with the developing of Industry and agriculture,environmental problems got even worse.The pollution of the Antarctic can not be ignored any more even though it used to be very clean.Especially,the influences caused by Persistent Organic Pollutants(POPs)should not be underestimated.They would not only cause the pressure on the environment,but also result in the local ecosystem and human health.Fildes peninsula on the King George Island of the South Shetland Islands,Subantarctica,as one of most popular region of the Antarctic research station,China Antarctic great wall station is also located on here.Fildes Peninsula has been studied by many researchers,in terms of the organic pollutants.However,at present,most researches focused on the environmental media rather than the concentration in biota.Since there is a great value of exploitation and utilization regarding to the Antarctic biological resources,pollution,a comprehensive research on pollution situation,potential sources,accumulating regulation,and health risk assessment of typical POPs exiting in seafood in this region would have a significantly positive impact on the exploitation and protection of the Antarctic resources in the further.This study determined the concentration of polychlorinated biphenyls(PCBs),organochlorine pesticides(OCPs),and polycyclic aromatic hydrocarbons(PAHs)of typical biological samples collected in several research strantions on Fildes Peninsula in 2014,and analyzed the their composition and sources.Moreover,this study also provided a preliminary assessment about the potential consumption risks of non-cancer diseases and cancer resulted by those three kinds of typical POPs.In addition,this study was also conducted to determine and analyze the concentrations of such three POPs in algae collected from same research stations for the further analysis on their transfer pattern along the food chain.As the result,the total concentrations of PCBs?OCPs and PAHs in biological samples,based on dry weight,were determined in the range of 17.92-59.24 ng/g,25.92-111.84 ng/g,and25.36-164.95 ng/g,respectively,which was caused by the different accumulating capacities of biological diversity.With the concern of other research areas,the seafood in Fildes Peninsula were less polluted by PCBs and PAHs compared with the medium pollution level of OCPs.Moreover,based on the analysis of the PCBs composition in seafood,it was found that homologues of trichlorobenzene and hexachlorobenzene were dominant components.Withrespect to the OCPs component analysis,?-HCH organisms in this study as the main pollutant OCPs,hybrid HCHs in seafood through the analysis of the HCHs is mainly from the previously used,use without the presence of Lin Dan and the new industrial HCHs.Additionally,the PAHs of Fildes Peninsula seafood were mainly composed of Low-molecular weight tricyclic and tetracyclic PAHs,which probably caused by the petroleum input by estimating their original source with ratio method.POPs in algae composition analysis showed that the comparison between different stations and pollutant concentrations of algae and limpets trend,concentrations of pollutants in algae and limpets in the same position a geometric scale magnification.As far as the edible safety assessment of the seafood from the Fildes Peninsula,average residual levels of PCBs,OCPs and PAHs in the seafood were within the national limitation range.The health risk assessment showed that,the daily intake of PCBs,OCPs and PAHs from the seafood were in the range of between 4.27-14.11 ng/kg bw/d,6.17-26.63 ng/kg bw/d,and6.04-39.27 ng/kg bw/d,which met the national standard.Moreover,as the non-carcinogenic risk of PCBs and OCPs were both in the acceptable range,the consumption of these seafood products would not cause any harm to human health.However,there were still some potential carcinogenic risks of the intake of PCBs,OCPs and PAHs so that the excessive intake of such products could cause cancers. |
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