南昌市街道灰尘重金属污染特征及形态分析研究

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1、ABSTRACTABSTRACTUrbanstreetdustwhichisasortofpollutantaswellascarrierofheavymetalsbelongstotheresearchscopeofurbanenvironmentalstudy．Concentrationofheavymetalsinurbanstreetdustismainlyaffectedbyhumanrelatedactivitiesastraffic，transportation，industrialproductionandurbanconst

2、ruction．Urbanstreetdustisdetrimentaltohumanhealthbyrespirationandskintouch．Therefore，itisofprofoundscientificandpracticalsignificancetostudyonpollutioncharacteristicsofheavymetals(Pb、Cu、Cr、Mn、Ni、Cd、Zn)inNanchangstreetdust．Physicochemicalcharacteristics，totalconcentrationand

3、chemicalformsofheavymetalsareanalyzedinordertoinvestigateits’distributionfeatures，SOurCeS，pollutioncondition,accumulationdegreeandpotentialecologicalhazard．ThemainconclusionsofthisstudyCanbesummedupasfollows：TheoveralllevelofheavymetalsinstreetdustofNanchangmaintainshigh．Th

4、eaveragecontentsofPb、Cu、Cr、Mn、Ni、Cd、Znare1．59，8．15，2．9，2．37，2．21，3．17，39．36timesincomparedwithsoilbackgroundvalueofNachang．ThemostpollutedareaisBayiroad、Ⅳitllheavytrafficandhighvehicalflow；secondly,theZhongshanroadcommercialareaandNanjing-Beijingroad．Incomparison、析tllothers

5、treetdustinothercitiesinandabroad，itisobviouslythatthesituationofheavymetalspollutioninNanchangisnotoptimistic．ExceptfromPb、Mn、Ni，theconcentrationofCu、Cr、Cd、Znaremorethantheaveragelevelindomestic，amongstwhichZnisthehighestandPbisthelowest．Assessthepollutiondegreebyusingenri

6、chmentfactormethod．Itshowsthat：Znisthemostaccumulated，followedwithCuandCd．Pb，Cr,Mnwhicharemoderatelyaccumulated．Niaccumulatedtheleast．Choosethemost4seriouslyaccumulatedheavymetalsCu，Cr，Cd，Znforpontentialecologicalhazardassessment．ItcometotheconclusionthatexceptthatCrisatrel

7、ativelyhighercontaminationlevel．therest3heavymetalsareallatllighcontaminationlevel，especiallyCd、Zn．TheselectivesequentialextractionproceduresBCRwasusedtostudychemicalspeciationofheavymetalsinurbanstreetdustinNangchang．TheresultsshowthatIIABSTRACTCr、Zn、Pb、NiandMnarepresentma

8、inlyintheresidualfractionwhicharerelativelystableinurbanstreetdust．CuandCdexistedm