重铬酸钾法测定COD中的干扰及消除

©1994-2009ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:(1976-),,,::1674-6139(2009)06-0124-03COD1,2(1.,116035;2.,116600):(COD),CODCl-NO-2S2-Fenton,,:COD;;:X52:AEliminationofInterferenceonCODMeasurementbyK2Cr2O7MethodSunDongyue1,GuanXiangyuan2(1.DalianDongtaiOrganicWasteTreatmentCo.,Ltd.,Dalian116035,China;2.DalianDongtaiIndustrialWasteTreatmentCo.,Ltd.,Dalian116600,China)Abstract:Chemicaloxygendemand(COD)isoneoftheimportantindicatorstodescribethedegreeoforganicpollutionofwaterquality,evaluatewaterqualityandeffectivenessofsewagetreatmen.Atpresent,thesulfuricacidpotassiumdichromatere2fluxmethodisthemostusetodeterminateCOD.IfexistingmaterialssuchasCl-NO-2S2-Fentonreagentinthewater,theywillinfluencetheresultofchemicaloxygendemand(COD)measurement.ThearticlediscussedthatwhenwedetermineCODwithK2Cr2O7,whattheinterferencesituationoftheresultwouldbe.Thearticleisemphasizeddiscussingthemethodofremovingvari2ousinfluencingfactorsandexplainedthevirtueandshortcomingofthemethod.Keywords:ChemicalOxygenDemand(COD);interference;eliminationCOD,,mg/L,COD()[1]:(1)K2Cr2O7,,;(2)K2Cr2O7,;(3),90%;(4),;(5),,,Fenton,CODCOD1Cl-1.1Cl-COD,[2],:6Cl-+Cr2O2-7+14H+=3Cl2+2Cr3++7H2OCOD,,,Ag2SO4,:Ag++Cl-=AgCl,,,421©1994-2009ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.[3],,,COD,1.2Cl-1.2.1HgSO430mg/L,,Hg2++4Cl-=[HgCl4]2-[HgCl4]2-,Cl-,014g40mg,20100mL,2000mg/L,,z=10z1(W/W)[1][4]10z120z130z140z1z=10:1,,;z20z1,,,,,014g[1],0127g,COD,COD,[5]CODMgSO4,Ag2SO4Cl-,1.2.21000mg/L,1000mg/L[1]COD(COD300mg/L),Cl-(Cl-2104mg/L)COD,100mg/L,,[6][7]COD,,COD,1.2.3COD,,,,CODCl-,,SO2-4Ag2SO4,;,AgNO3Cl-,AgNO3,,AgNO3[8][9],Ag+Cl-115z1,CODCl-COD2NO-22.1NO-2NO-2K2Cr2O7,:3NO-2+Cr2O2-7+8H+=3NO-3+4H2O+2Cr3+[10]0mg/L200mg/LNO-2,NO-2CODcr[11]1mgNO-2013470mgCODcr2.2NO-22.2.1NO-2H2NSO3H:H2NSO3H+HNO2=H2SO4+H2O+N21mgNO-210mg,NO-2[12],,2.2.2NO-2,(),:NH4SO3NH2+HNO2=NH4HSO4+H2O+N2[10]1mgNO-215mgCODcrNO-2CODcr,2118%3S2-3.1S2-S2-,CODcr3.2S2-3.2.1S2-,,,CODS2-1mgS2-SO2-42521©1994-2009ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.[13],,S2-,3.2.2S2-,,,S2-S[14][15]pH2,S2-30min,CODcr,S2-,10%4Fenton4.1FentonFenton,COD,[16](1),,(H2Cr2O12);(2),Fenton[17],,,,4.2Fenton4.2.1,,:,,COD;,,,,COD4.2.2H2O2CODH2O2,COD,CODH2O2,H2O2[18]50mg/L100mg/LH2O2COD,31392,01017,,,,,5,COD,,,,:[1]...[M].:,2002:210-213.[2],.[M].:,2006:312-318.[3].Cl-NH+4[J].(),2005,26(3):209-213.[4].COD[J].,2005,17(1):26-27.[5].COD[J].,1991,10(8):27-29.[6],.(COD)[J].,2007,35(5):60-63.[7],.COD[J].,1998,14:38-40.[8].[J].,2003,17(4):28-29.[9].COD[J].,2007,28(6):54-56.[10],.CODcr[J].,2002,20(5):62-64.[11].[M].:,1986:153.[12].()[M].:,1990:225-238.[13].[M].:,1999:210-211.[14].COD[J].,2003,25(3):787-788.[15],.CODcr[J].,2007,25(6):73-75.[16],.[J].,2008,33(4):11-13.[17],.[J].,2003,26(1):36-38.[18],.FentonCOD[J].,2001,17(2):27-28.621