厦门西港近岸海域沉积物重金属污染及铅锶同位素示踪分析-heavy metal pollution and trace analysis of lead and strontium isotopes in sediments of xiamen west harbor coastal waters.docx

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厦门西港近岸海域沉积物重金属污染及铅锶同位素示踪分析-heavy metal pollution and trace analysis of lead and strontium isotopes in sediments of xiamen west harbor coastal waters.docx

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厦门西港近岸海域沉积物重金属污染及铅锶同位素示踪分析-heavy metal pollution and trace analysis of lead and strontium isotopes in sediments of xiamen west harbor coastal waters

AbstractThecontent,distributionandspeciationofheavymetalsinthesedimentfromXiamenwesternBaywerestudied.ThepollutionsourceandcontributionofheavymetalsinthesedimentwererevealedbyusingPb-Srisotopetracingtechnique.Theconclusionsweresummarizedasfollows,ThecontentofheavymetalsinthesurfacesedimentofeachsitefromXiamenWesternBaywasasfollows,Fe＞Ti＞Mn(majorelements),Zn＞Ba＞Cr＞Cu＞V＞Ni＞Li＞Pb＞Sr＞Co(tracemetals).Thecontentleveldifferencesofheavymetalswerelarge.Mostelementshaddifferentdegreeofpollution.Fe,Ti,Ba,Co,VandLimainlyexistedintheresidualfractions.Pbmainlyexistedintheresidualfraction,followedbyextractablefraction.TheresidualfractionsofZn,Sr,Cr,Cu,MnandNiwerenotdominant.Assessmentresultsofheavymetalpollutioninthesurfacesedimentsusingseveralevaluationmethodswerebasicallyaccordant.ThepollutiondegreeofCu,Zn,Co,Cr,PbandNiweresevere.SamplingsiteS7wasthemostpolluted.Ratiosofsecondaryphasetoprimaryphase(RSP,forshort)ofFe,Ba,Co,VandLiwerelessthan1.0ateachsamplingsite.ThemaximumRSPvaluesofZn,Cr,CuandNiinS7showedseverepollution.TheRSPvaluesofZn,Cr,CuandNiinS8andS13showedminorpollution.ModifiedBCR-sequentialextractionshowedtheresidualfractionsofFe,Zn,Ba,Ti,Co,Cr,Ni,PbandVweredominantincoresediments.Lowlevelsofotherthreefractionsshowedaweakmigrationoftheaboveheavymetals.InthecoresedimentsofH1andH2,Zn,Cu,CoandNishowedhighlevelsinnon-residualfactions,whileresidualfactionsinregolithandparentmaterialweredominant.ThehumaninputofZn,Cu,CoandNiwereobvious.DirectemissionwasthemainpathwaysofheavymetalpollutioninH1andH2coresediments.AtmosphericdepositionandindustrialIIIdischargewerethemainpathwaysofheavymetalpollutioninH3coresediment.Pbisotopiccompositionhadgreaterdifferencesinsurfacesediments.PbpollutionatsitesS1,S2,S3,S4andS5wasmainlyfromindustrialemissionsandPb-Zndeposit.Pbpollutionatothersamplingsiteswasmainlyfrommarinepaintsandelectroplatingsewage.Pbisotoperatiosinsurfacesedimentsweredifferentfromthoseinvehicleexhaustandcoalcombustion.Pb-ZndepositwasmainpollutionsourcesinsomeH2coresediements.Mo