Designation:D4548−11(Reapproved2019)StandardTestMethodforAnion-CationBalanceofMixedBedIon-ExchangeResins1ThisstandardisissuedunderthefixeddesignationD4548;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddeterminestheratiobetweentheequivalentsofanion-exchangecapacityandtheequivalentsofcation-exchangecapacitypresentinaphysicalmixtureofsalt-splittinganion-exchangematerialandsalt-splittingcation-exchangematerial.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D1129TerminologyRelatingtoWaterD1193SpecificationforReagentWaterD2187TestMethodsandPracticesforEvaluatingPhysicalandChemicalPropertiesofParticulateIon-ExchangeResins3.Terminology3.1Definitions:3.1.1Fordefinitionsoftermsusedinthisstandard,refertoTerminologyD1129.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1anion-exchangematerial,n—anion-exchangemate-rialcapableofthereversibleexchangeofnegativelychargedions.3.2.2cation-exchangematerial,n—anion-exchangemate-rialcapableofthereversibleexchangeofpositivelychargedions.3.2.3ion-exchangematerial,n—aninsolublematerialthathastheabilitytoexchangereversiblycertainionsinitsstructureorattachedtoitssurfaceasfunctiona...
