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pH(,643100):pH,pH,pH,pH:pH;;:X83013:A:100123644(2006)0120058203DiscussiononCalculationofAveragepHValueinEnvironmentalMonitoringZHONGLin(RongxianEnvironmentalMonitoringStation,Rongxian,Sichuan643100,China)Abstract:BasedontheconceptofpHandthetheoryofionizationequilibriumofaqueoussolution,anewcalculationmethodforaveragepHvalueisdeveloped,whichovercomestheshortcomingsofsomeconventionalmethods,andalsohasapracticalsignificancetoprocessandevaluateaciddepositionandwatermonitoringdata1Keywords:AveragepHvalue;environmentalmonitoring;calculatingmethod:2005205224:(1965-),,,2005,,,1,pH,pHpH,pH,pH,pH2pH,pHHJ/T1652004,HJ/T912002HJ/T1642004198620005,pH[H+],pH,,pH,[H+]pH,pH,pH(),,pH=6pH=8,,pH=6130pH=6pH=8,,,pH=7,[1],pHpH,,,pH=6pH=8,pH=7,pH,pH,852006251,[2],[H+][OH-]pH=-log{(1N(N1i=110-pHi-N2i=110pHi-14)}[H+][OH-]pH=14+log{(1N(N2i=110pHi-14-N1i=110-pHi)}:pHipH;N1pH;N2pH;NpH7pHpH7,,,[H+][OH-]pH:pH61807130,pH=14+log[12(10713-14-10-618)]=6131pH6131,pH,3[H+][OH-]:npHpH1pH2pHipHn,[H+][OH-],,,,pHnpH,pH,[H+],V1V2ViVn,:H+=[H+]iViOH-=[OH-]iVi:[H+]i=10-pHi;[OH-]i=10pHi-14H+=OH-,,pH=7H+OH-,,H+=OH+-OH-,[H+]=H+V,V=ViVH+,H2OH++OH-,[H+][H+][H+],[H+]=[H+]+[H+],[OH-]=10-14[H+],,:[H+]=[OH-]=10-14[H+],:[H+]=[H+]+10-14[H+][H+]=[H+]+[H+]2+410-142pHpH=-log[H+];[H+]110-6[3],,[H+]=[H+],:pH=-log[H+];H+OH-,:[OH-]=[OH-]+[OH-]2+410-142,:pH=-log10-14[OH-]=14+log[OH-];[OH-]110-6,,[OH-]=[OH-],:pH=14+log[OH-]4411pHpHpH41111pHS22C();E22012CpH;50ml;500ml952006251;41112;;pH4111330min,,pH:711541521019810160816450100ml500ml,pH,pH=10130412pH:7115415210198101608164,pH=10130412111986[H+]():pH=5122,41212:pH=8138,2pH,41213H+=3102726382410-5OH-=11357606510-3OH-[OH-]=2165466772410-4110-6pH=14+log[OH-]=10142,41214pH7pH,,61807130H+=2108608042610-7OH-=2162621965910-7[OH-]=2170069616710-8110-6[OH-]=1114411082110-7pH=14+log[OH-]=710641215pH=6pH=8pH,H+=10-6+10-8OH-=106-14+108-14=10-8+10-6H+=OH-,,pH=7:[1]1pH[J]1,1990,6(4):552561[2]1pH[J]1,1991,7(1):622631[3]1[M]1:,19851891(54)[3]GJWall,AWBos,AHMarshall,1[J]1,1998,(2):222241[4],,1[J]1,2001,19(4):62226281[5],,,1-NP[J]1,2001,20(3):192231[6],1[J]1,1994,13(4):212241[7]HY003291,[S]1[8]ChangSC,MLJackson1Fractionationofsoilphosphorus[J]1SoilSci1,1957,84:13321441[9],1[J]1,1990,21(1):622691[10],1[J]1,1992,23(4):38723951[11],1[M]1:,19911[12]1[M]1:,1989110421081[13]1[M]1:,19901[14]HisashiYAMADA,MitsuKAYAMA1Distributionanddissolutionofseveralformsofphosphorusincoastalmarinesediments[J]1Oceanol1Acta,1987,10(3):31123211[15]WilliamaJD,etal1AvailabilitytoScenedesmusquadricaudaofdifferentformsofphosphorusinsedimentarymaterialsfromtheGreatLakes[J]1Limnol1Oceanogr1,1980,25:12111[16],1[J]1,1998,17(1):152191[17],1[J]1,1999,18(3):482521062006251