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1、腐殖酸对土壤铅赋存形态的影响（Effectofhumicacidontheoccurrenceofleadinsoil）EffectofhumicacidontheoccurrenceofleadinsoilThehighjump1,HanXiaokai1,LiYanhui2,guanlianzhu1,YanLi1*1.、Schooloflandandenvironment,ShenyangAgriculturalUinversity,Liaoning,Shenyang;110161;2..Shenyangagriculturalt
2、estingcenter,Liaoning,Shenyang110034Abstract:throughindoorcultivationexperiments,theeffectsofdifferentamountsofhumicacidonPbspeciationinleadcontaminatedsoilwereinvestigated.TheresultsshowedthathumicacidtreatmentscouldsignificantlyreducetheexchangeablePbinsoil(EX-)(Cob-
3、),carbonateboundandFeMnoxides(FeMn-)andthecontentoforganicboundPb(Ob-)andresidualfraction(Res-)significantlyincreasedthecontentoflead.Humicacideffectivelyreducedtheactivityoflead,andtheinfluencedegreeincreasedsignificantlywiththeincreaseofhumicaciddosage.Effectofhumica
4、cidonleadionsinsoilsofvariousformsofcontentchangewithtimefor0~40incultureduringtheperiodofD,withtheprolongationoftheculturetimeexchangewithoutsignificantchangesinPbcontent,leadcontentofresiduedecreasedsignificantly,theotherthreewereincreased;after40dculture,withculture
5、timeextendthevariousformsofcontentdidnotchangesignificantly.Itisconsideredthatthehumicacidwith10%massratiocansignificantlyreducetheactivityoflead,soastoachieveabetterrepaireffect.Keywords:humicacid;soil;lead;speciationCLCnumber:X131.3documentidentificationcode:Aarticle
6、number:1672-2175(2008)03-1053-05Table1PhysicalandchemicalpropertiesoftestedsoilTable1BasicphysicalandchemicalpropertiesintestsoilSoiltypetexturew(organicmatter)/(G.Kg-1)pH(H2O)w(CaCO3)/(G.Kg-1)B(CEC)/(CMoL.Kg-1)w(freeironoxide)/(G.Kg-1)w(amorphousironoxide)/(mg.Kg-1)br
7、ownsoilloamy15.6,6.5,14.5,16.3,14.96,84.62Leadisaheavymetalwithneurotoxicity.Soilcontaminatedbyleadcancausecropgrowthretardation,yielddecreaseandqualitydecline.Throughthefoodchainonthehumannervoussystem,blood,immunesystemandbloodvessels,liver,kidneyandotherorgansandorg
8、ans,nervousparticularlyprominent[1].However,withtherapiddevelopmentofindustry,thepollutionofleadisbecomingmoreandmore
