高浓度氯离子化工废水中COD测定方法比较

!#!!!!!!1.321007#2.321000$!COD,~~~,,,,COD,!;COD;!X832!A!1005-829X(200605-0072-0326520065IndustriaIWaterTreatmentVOI.26NO.5May,2006Abstract:Inchemicaiengineeringproduction,theexistenceofhighchiorideinfiuencestheaccuracyofCODdeterminationdirectiy.Throughthecomparisonsofdiiutionmethod,siivernitrateprecipitationmethod,siivernitrateandchromiumpotassiumsuifatemethod,chiorinerectificationmethod,andstandardcurvemethod,therectifiedcoefficientofthestandardcurveisobtained,toeiiminatetheinterferenceofchioride-containingcompoundeffectiveiy.ItcanbeoperatedfiexibiyandobtaincomparativeiyaccurateCODdeterminationresuits.Atthesametime,itcanreducetheharmtohumanbodiesiniaboratoriesandenvironmentaisecondarypoiiutioncausedbyusingthepoisonouschemicais.Keywords:chemicaiwastewater;CODdetermination;chiorideionComparingandsurveyingthedeterminationofCODexistinginchemicalwastewaterwithhighchlorideionWangFangyuan1,ShengYiiin1,ZhengShaocheng2(1.JinhuaCollegeofProfessionandTechnology,Jinhua321007,China;2.ZhejiangNormalUniuersity,Jinhua321000,China~~,,,CODOCOD(GB11914-19891JO,CODO,2000mg/L,CODO,CODO1COD(GB11914-1989,1J,2000mg/L,,2000mg/L,CODOCOD,COD(50mg/L,0.25moi/LCOD,OCOD,O,CODO2Ag+Ci-AgCi,AgCi1.810-10O,,,,COD2JO,,Ci-,72AgCl0AgCl03CrCl2+3O04COD!()=!()=l0=1;1000mg/LCOD250mg/LOO54OOOCl-20000mg/L\COD30mg/LOOl\O6COD-()CODCODCl-5O()CODCOD(!)OCODCOD()COD1COD=COD(!)-COD()OOCOD-Cl-O77.1()COD1OCOD#Cl-lO1CODmg/L=0.2228$+%!CODlCODO0.2228O1mgCl-0.2250mgO7.27.2.1(500mL300mm50mL10\20mL50\100mL);0.2500mol/LK2Cr2O7;0.1mol/L;;H2SO4;O7.2.2COD20mL500mL0.25mol/L10mL30mLO0.5h0.3g1.5hO90mL140mLOCl-(mg/L)COD/(mg0L-l)l2501500175020002250l281338380445500228934640145051632843413984535162853423934495102006-0526(5)73020mL,0:COD(!D=(!0-!lD8000I/!2:---,mol/L;!0---,mL;!1---,mL;!2---,mLO,COD(!DO0.51,,O7.3,50mL,150mL,1mL,,O!(Cl-D=(!2-!1DAgNO335.451000J/!:!1---,mL;!2---,mL;!---,mL;AgNO3---,mol/LO7.4COD,O,(0.4gDCOD,COD(D,COD(DCOD,CODO,COD(DCOD(!D0.2228!(Cl-D,CODCOD(D=COD(!D-0.2228!(Cl-D+##,COD,O7.5~#OCOD,,#=COD(!D-COD(#DJ0.3OCOD(D=COD(!D-0.2228!(Cl-D+#,,,2O2CODmg/L2,COD,5.5%,O8(1DCOD~~O(2DCOD,2000mg/L~COD200mg/L,COD,5.5%O(3D,COD,,,O!1].M].:,1997:127-131.2],,.CODCl-J].,1999(6D:18-23.3],,.CODCrJ].,2001(12D:251-254.4].J].,2002(3D:21-25.5],.CODJ].,2003(6D:168-175.6],,.M].:,1998:61.!(Cl-DCOD(!DCOD($D#CODCOD/%12784672.0620.316.768.468.00.623008740.0676.119.283.179.05.232865706.0644.218.580.378.52.343140769.0699.621.190.586.05.253106735.0692.012.955.953.05.562966706.0660.814.559.758.52.173257783.0731.615.466.864.04.483082746.0686.717.977.274.04.392890694.0649.813.363.461.53.1103242776.0722.316.169.867.04.2!(1966-D,1998,,:13064646880,E-mail:[e-mail]!2005-12-30(D!COD2006-05,26(5D74