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1、RadiochemistryandNuclearChemistry1SelectiveExtractionofAmericiumOverLanthanidesFromNitricAcidbyDPTPTANGHong-bin,CHENGQi-fu,YEGuo-an,YEYu-xing,JIANGDe-xiang,ZHUWen-bin,CHENHui2,6-bis(5,6-di-n-propyl-l,2,4-triazin-3-yl)-pyridinc(DPTP)wassynthesizedbyusinganimprovedmethod・Consideringthegoodsolubility
2、ofDPTPandavoiding3th-phaseformation,30%octanol-dodecane(ODOD)wasselectedasdiluent.ThedistributionratiosofAm(III)andEu(III)werestudiedasafunctionofanumberofparameterssuchascontacttime,nitrateionandthenitricacidconcentrationsinaqueousphase,theconcentrationofDPTPintheorganicphase・Theresultsshowthat5m
3、inarcenoughtoreachtheextractionequilibriumforAm(III)andEu(III),valuesincreaseobviouslywithincreasingaqueousnitricacidconcentration,buttheseparationfactor,SFAtn.eu，arenearlyconstantintherangeof100-120forthissystem.ThedistributionradiosofLa,Ce,Nd,Sm,Gdweremeasuredtobe10“for0.02mol/LDPTP/ODOD.Radiati
4、onstabilityofDPTPwasstudied,andtheresultsshowthatDmwaskeptfixedwhentheradiationdoseisGy,anddecreasedobviouslywhentheradiationdoseisover5xl04Gy.Theamericiumcanbere-extractedeffectivelyfromorganicphaseby0.01mol/LHNO3.2StudyonExtractionBehaviorofAm(IH)andLn(III)WithiPr-BTPCHENGQi-fu,TANGHong-bin,JIAN
5、GDe-xiang,YEGuo-an,YEYu-xing,ZHUZhi-xuanByusing30%octanol/〃-dodccancasdiluent,theextractionbehaviorofAm(III)andlanthanidcs(III)fromnitricacidsolutionwasstudiedwith2,6-bis-(5,6・di-i・propyl-l,2,4-triazin-3-yl)-pyridine(iPr-BTP).Theeffectofsomeparameters,suchastheconcentrationofnitricacid,theconcentr
6、ationofiPr-BTP,diluentcomposition,ionicstrengthandthecontacttimeonthedistributionratioofAm(III)andlanthanides(in)isalsoinvestigated.TheresultsshowthattheextractionequilibriumofAmisreachedwithin5min,howeverthekineticsoftheextractionofEuisslower,sinceequilibriumisonlyreachedafter15min.Whentheconcent
7、rationofHNO3isintherangeof0.2-1.0mol/L,thedistributionofAm(III)andlanthanides(III)isnearlyconstant.Inaddition,thecompositionoftheextractioncomplexesandtheextractionreactionequationareexamined,anditisfoundthatthee
