【英文标准名称】:StandardTestMethodsforTotalandDissolvedCarbonDioxideinWater
【原文标准名称】:水中二氧化碳溶解量和总量的标准试验方法
【标准号】:ASTMD513-2006
【标准状态】:现行
【国别】:
【发布日期】:2006
【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】:D19.05
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:重酸式碳酸盐;二氧化碳;含量测定;试验;水
【英文主题词】:carbondioxide(CO2);coulometry;gas-sensingelectrode
【摘要】:Carbondioxideisamajorrespirationproductofplantsandanimalsandadecompositionproductoforganicmatterandcertainminerals.Theatmosphereaveragesabout0.04vol%ofCO2.Surfacewatersgenerallycontainlessthan10mg/L,exceptatlocalpointsofabnormalorganicormineraldecomposition;however,undergroundwater,particularlydeepwaters,maycontainseveralhundredmg/L.Whendissolvedinwater,CO2contributessignificantlytocorrosionofwater-handlingsystems.Thisisparticularlytroublesomeinsteamcondensatesystems.LossofCO2fromanaqueoussystemcandisturbthecarbonateequilibriumandresultincalciteencrustationofconfiningsurfaces.Scalingofwaterheatersisagoodexample.Becauseofthedelicatebalancebetweencorrosionandencrustationtendencies,muchcaremustbegiventocontrolofCO2andrelatedspeciesinwatersystems.Recarbonationofmunicipalsuppliesduringfinalstagesofsofteningandamineneutralizationofsteamcondensateareappliedforthesepurposes.1.1Thesetestmethodscoverthemeasurementoftotalordissolvedcarbondioxidepresentascarbondioxide(CO2),carbonicacid,bicarbonateion,andcarbonateioninwater:RangeSectionsTestMethodA(GasSensingElectrode)2to800mg/L8to15TestMethodB(CO2Evolution,CoulometricTitration)5to800mg/L16to24