福建省菜园土壤重金属的含量及其污染评价.docx

福建省菜园土壤重金属的含量及其污染评价福建省菜园土壤重金属的含量及其污染评价摘要：采集了福建省26个县市158份菜园表层土壤样品,测定了土壤样品中重金属含量,采用单项及综合污染指数法对土壤重金属污染进行评价分析,并通过元素相关性分析和聚类分析,研究了菜园土壤重金属元素的赋存特征与区域分布.结果表明,福建省菜园土壤存在着不同程度的重金属污染,主要污染元素为Pb,Hg和Cd;元素相关性分析与聚类分析的`结果表明:Cu,Zn,Ni和As具有伴随污染的特点,其污染源主要来自土壤母质和大量施用的农药和化肥;Cd,Pb和Hg在土壤中各聚成一类,说明它们在菜园土壤具有较独特的污染源,特别是Cd和Hg,其污染特征明显.而Pb和Cd虽有各自的污染源,但其污染具有一定的相关性.Abstract：Concentrationsofheavymetalsin158top-soilscollectedin26citiesinFujianProvincearemeasured,andthecontaminationofheavymetalsinsoilsisassessedwithsingle-factorpollutionindexandNemerowcomprehensivepollutionindex.Inaddition,theregionaldistributionandpollutionsourcesofheavymetalsinsoilsarealsoinvestigatedwiththemethodsofelementalcorrelationanalysisandclusteranalysis.Theresultsshowthatmostofthesoilsinthesampledareasarecontaminatedtosomeextent,withheavymetalsincludingPb,CdandHg.TheresultsofcorrelationanalysisshowthatCu,Zn,NiandAsaretheconcomitantelementsinsoils,whichindicatesthattheseelementscommonlyexisttogetherinthepollutantssuchasparentsoilmaterial,andagriculturalpesticidesandfertilizers.However,Cd,PbandHginsoilsarefoundtobeseparatelyself-existentbasedontheclusteranalysis,whichshowsthateachoftheelements,especiallyCdorHg,maycomefromthedefinitepollutionsources.ButacorrelationbetweenCdandPbisobservedtopresentinsoilsalthougheachofmetalsownsitspollutionsources.Theresultsindicatethatthecontaminationofheavymetalsinsoilsmaybeeffectivelyidentifiedandcharacterizedwiththemethodsofcorrelationanalysisandclusteranalysis.作者：余江  黄志勇  陈婷  秦德萍  YUJiang  HUANGZhi-yong  CHENTing  QINDeng-ping 作者单位：集美大学生物工程学院,厦门,361021 期刊：环境化学 ISTICPKU Journal：ENVIRONMENTALCHEMISTRY 年，卷(期)：2009, 28(6) 分类号：X13 关键词：菜园土壤  重金属  污染评价.  Keywords：vegetable-grownsoils  heavymetals  contamination  assessment.