EDTA直接滴定测定镍

EDTA(,518104):345356,,,,:EDTA;;;:X830.2:B:100326504(2006)20042202,,;,1,,-(pH=5.6),,,ED2TA,EDTA[1]2[2]2.1100gCH3COONa2H2O,CB6mol/LCH3COOH3mL,2.2(5g/L)0.5g,,45,100mL,2.31.0000g(99.95%),20mL(3+2),10mL(1+1),,100mL,,,1L,1mg/mL2.4EDTA20g250mL,,pH=6,1L,:8001g,:(1946-),,,()13634175820()[e-mail]0.0002g,20%,250mL,,30.0035.00mL,70mL,(10%)pH78,10mL2(pH=10)55g/LT,(1):C(EDTA)=m(V1-V2)0.08138(1):C(EDTA),mol/L;m,g;V1,mL;V2,mL;0.081381.00mL[C(EDTA)=1.00mol/L]2.5C[Zn(Ac)2]=0.025mol/L,5.5g,50mL,0.5mL,1L,:0.05mol/LEDTA25mL(3)250mL,50mL,10mLpH=10,5T,,EDTA,(2):C[Zn(Ac)2]=C1(V1-V2)V(2):C1EDTA,mol/L;V1EDTA,mL;V0EDTA,mL;V,mL2.62429200682.750g/L2.8200g/L30.2000g250mL,,15mL,10mL,,,,,,100mL,,20mL(10%),,10mL(50g/L),,[3]3min,,500mL,34(1+1)(1+1)pH5.610mL-,10mL(200g/L),EDTA(510mL),4,Ni(%)=(C1V1-C2V2)0.05698M0100(3):V1EDTA,mL;C1EDTA,mol/L;V2,mL;C2,mol/L;M0,g:,,3mL,4mL50mL,,4(1)9.25%0.10%,99.5%(2)20mL100mgFe3+,10mL(200g/L),70mgMn2+(3),,,,,,,,[][1].()[M].:,2004.[2],,.[J].,2006,29(5):34236.[3],,.[J].,2004,27(5):20230.(2006201204;2006204210)DeterminationofNickelbyEDTADirectTitrationMethodHANPing2xue(ShenzhenDongjiangEnvironmentalProtectionLtd.,Co.Shenzhen518104)Abstract:Accordingtothestrongcorrosionofphosphoricacidbetween345and356centigrade,theauthorde2composedthesamplewithsulfur2phosphorusmixtureacid.Itshowedthatthesamplecouldbedissolvedcom2pletelyinthisprocess.Thisanalysismethodwasverifiedwellaccuracyandrepeatabilitybyrunningstandardadditionandrecoveryexperiments.Keywords:determinationoflowgradenickelmattebyEDTAtitration;decompositionwithsulfur2phosphorusmixtureacid;removalofFewithNaF;removalofMnwith(NH4)2S2O834EDTA