资源描述：
《长春市城区表层土壤重金属污染来源解析.pdf》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、第22卷5期城市环境与城市生态Vo.l22No.52009年10月URBANENVIRONMENT&URBANECOLOGYOct.200929*长春市城区表层土壤重金属污染来源解析1,2212杨忠平,卢文喜,刘新荣,辛欣(1.重庆大学土木工程学院,重庆400045;2.吉林大学环境与资源学院,长春130026)摘要:为剖析长春市城区表层土壤中重金属污染来源,采用网格化均匀布点系统采集了352件长春市城区表层(0~20cm)土壤样品,分别采用X荧光光谱法(XRF)、原子荧光光度法(AFS)和石墨炉原子吸收光谱法(GF-AAS)测定土
2、壤中Cu、Pb、Zn、Cr、As、Hg和Cd。结果表明:长春市城区表层土壤中w(As)、w(Cd)、w(Cr)、w(Cu)、w(Hg)、w(Pb)和w(Zn)分别为12.5、0.132、66.0、29.4、0.118、35.4、90.0mg/kg,且其变化范围较大,同时均显著高于研究区表层土壤背景值,已受到一定程度重金属污染。运用主成分分析法对土壤中重金属污染来源进行解析,结果表明,长春市城区表层土壤中不同重金属来源存在着差异,其中Cu、Pb和Zn主要来自交通污染;Cr目前仍然主要受自然因素控制,来源于自然源;As和Hg主要来源于燃煤源;C
3、d主要来源于工业源及化肥施用。关键词:城市土壤;重金属;来源解析;主成分分析;长春市中图分类号:X131.3文献标识码:A文章编号:(K)09088(原1002-1264)(2009)05-0029-05SourcesIdentificationofHeavyMetalsinUrbanSoilofChangchunBasedonPrincipalComponentAnalysis1,2212YANGZhongping,LUWenxi,LIUXinrong,XINXin(1.CollegeofCivilEngineering
4、,ChongqingUniversity,Chongqing400045,China;2.CollegeofEnvironmentandResources,JilinUniversity,Changchun130026,China)Abstract:Anextensivesurveywasconductedtoevaluatethepotentialsources(PAS)ofheavymetalsintheurbanenvironmentofChangchun,China.Therewere352samplescollectedwitha
5、samplingdensity3-5compositetopsoil2samples(0~20deep)perkm.X-rayFluorescenceSpectroscopy(XRF),AtomicFluorescenceSpectrophotometry(AFS)andGraphiteFurnaceAtomicAbsorptionSpectrometry(GF-AAS)wereusedtoanalyzeCu,Pb,Zn,Cr,As,HgandCdconcentrationofsoi,lrespectively.Theresultsindi
6、catedthatthemeanconcentrationofAs,Cd,Cr,Cu,Hg,PbandZnintheurbantopsoilofChangchunwas12.5,0.132,66.0,29.4,0.118,35.4and90.0mg/kg,respectively,whichweresignificanthigherthanthebackgroundvalueofChangchuntopsoi;lmeanwhile,whichalsoshowedthatthetopsoilinChangchunwaspolluted.The
7、resultsofPrincipalComponentAnalysis(PCA)showedthattheheavymetalsintheurbantopsoilofChangchuncamefromdifferentsources:PbandZnmainlyoriginatedfromtrafficcontaminationwhileCrwasstillmainlycontrolledbynaturalfactors,andoriginatedfromnaturalsources;coalburninginindustrieswasthe
8、mainsourceofAsandHg;industrialsourceandtheapplicationofCd-containingphosphatefertilizersm
