【英文标准名称】:StandardTestMethodforOn-LineMonitoringofTotalCarbon,InorganicCarboninWaterbyUltraviolet,PersulfateOxidation,andMembraneConductivityDetection
【原文标准名称】:通过紫外线、过硫酸盐氧化作用、膜导电位检测对水中总碳、无机碳在线监测的标准试验方法
【标准号】:ASTMD5997-1996(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:1996
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D19.03
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:carbon;conductivity;inorganiccarbon;membrane;on-line;totalorganiccarbon;Carboncontent--water;Impurities--water;Inorganiccarbon(IC);Membraneconductivitydetection;Onlinemonitoring(inwateranalysis);Organiccarbon(OC);Totalorgan
【摘要】:Thistestmethodisusefulfordetectinganddeterminingorganicandinorganiccarbonimpuritiesinwaterfromavarietyofsourcesincludingindustrialwater,drinkingwater,andwastewater.Measurementoftheseimpuritiesisofvitalimportancetotheoperationofvariousindustriessuchaspower,pharmaceutical,semiconductor,drinkingwatertreatment,andwastetreatment.Semiconductorandpowerapplicationsrequiremeasurementofveryloworganiccarbonlevels(TOCx003C;1x03BC;g/L).ApplicationsinpharmaceuticalindustriesrangefromUSPpurifiedwater(TOCx003C;500x03BC;g/L)tocleaningapplications(500x03BC;g/Lx003C;TOCx003C;50000x03BC;g/L).Drinkingwatersrangefromx003C;100x03BC;g/Lto25000x03BC;g/Landhigher.Someoftheseapplicationsmayincludewaterswithsubstantialionicimpuritiesaswellasorganicmatter.Measurementofinorganiccarbonaswellastotalorganiccarbonishighlyimportanttosomeapplications,suchasinthepowerindustry.Continuousmonitoringandobservationoftrendsinthesemeasurementsareofinterestinindicatingtheneedforequipmentadjustmentorcorrectionofwaterpurificationprocedures.RefertoAnnexA1foradditionalinformationregardingthesignificanceofthistestmethod.1.1Thistestmethodcoverstheon-linedeterminationoftotalcarbon(TC),inorganiccarbon(IC),andtotalorganiccarbon(TOC)inwaterintherangefrom0.5x03BC;g/Lto50000x03BC;g/Lofcarbon.Highercarbonlevelsmaybedeterminedbysuitableon-linedilution.Thistestmethodutilizesultraviolet-persulfateoxidationoforganiccarboncoupledwithaCO2selectivemembranetorecovertheCO2intodeionizedwater.Thechangeinconductivityofthedeionizedwaterismeasuredandrelatedtocarbonconcentrationintheoxidizedsampleusingcalibrationdata.Inorganiccarbonisdeterminedinasimilarmannerwithouttherequirementforoxidation.Inbothcases,thesampleisacidifiedtofacilitateCO2recoverythroughthemembrane.TherelationshipbetweentheconductivitymeasurementandcarbonconcentrationcanbedescribedbyasetofchemometricequationsforthechemicalequilibriumofCO2,HCO3x2212;,H+,andOHx2212;,andtherelationshipbetweentheionicconcentrationsandtheconductivity.ThechemometricmodelincludesthetemperaturedependenceoftheequilibriumconstantsandthespecificconductancesresultinginlinearresponseofthemethodoverthestatedrangeofTOC.SeeTestMethodD4519foradiscussionofthemeasurementofCO2byconductivity.1.2Thistestmethodhastheadvantageofaveryhighsensitivitydetectorthatallowsverylowdetectionlevelsonrelativelysmallvolumesofsample.Also,theuseoftwomeasurementchannelsallowsdeterminationofICinthesampleindependentlyoforganiccarbon.IsolationoftheconductivitydetectorfromthesamplebytheCO2selectivemembraneresultsinaverystablecalibrationwithminimalinterferences.1.3Thistestmethodwasusedsuccessfullywithreagentwaterspikedwithsodiumcarbonateandvariousorganiccompounds.This......
【中国标准分类号】:Z16
【国际标准分类号】:13_060_50
【页数】:7P.;A4
【正文语种】:英语