An ecological risk assessment for heavy metals of the lead-zinc ore tailings-中国期刊网

摘要 ThestructureofPb,Zn,CuandCdinleadzincoretailingsoilsinYongzhou,HunanisanalyzedbytheoptimizedBCRsequentialextractionprocedure.Thecontentandproportionofheavymetalsoftheminearemeasured.Meanwhile,theecologicalrisksareevaluatedwiththeLarsHakanson’spotentialecologicalriskexponentialmethod.Theanalysisshowsthatthecontentofheavymetalsisveryhigh,reachingthelevelofseriouspollution.TheorderofmetalpollutiondegreesareCd>Pb>Cu>Zn.Ontheotherhand,itisverypossiblethattheheavymetalsmaycombinetogetherascompoundsorclingtothecrystalformofclay.Sincetheformofsolubleacidandfreemetalsareverylittle,itisnotaneasyjobformetalelutingorrestorationofplants.Yetitispossibletotakeoutthoseheavymetalsadoptingthechemicalextractiontechnology.DTPAandEDTA,indicatedbyaresearch,bothhaveiterativevalueandstrongconformityeffect.Sotheyareeffectiveelutriantstorestorethepollutedsoil.Achemicalextractionmethodisputforwardinthispaper.

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An ecological risk assessment for heavy metals of the lead-zinc ore tailings

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An ecological risk assessment for heavy metals of the lead-zinc ore tailings

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