Designation:D1782−95(Reapproved2009)StandardTestMethodsforOperatingPerformanceofParticulateCation-ExchangeMaterials1ThisstandardisissuedunderthefixeddesignationD1782;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesetestmethodscoverthedeterminationoftheoperatingcapacityofparticulatecation-exchangematerialswhenusedfortheremovalofcalcium,magnesium,andsodiumionsfromwater.Itisintendedforuseintestingbothnewandusedmaterials.Thefollowingtwotestmethodsareincluded:SectionsTestMethodA—SodiumCycle8to14TestMethodB—HydrogenCycle15to211.2ThevaluesgiveninSIunitsaretoberegardedasthestandard.Theinch-poundunitsgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1067TestMethodsforAcidityorAlkalinityofWaterD1126TestMethodforHardnessinWaterD1129TerminologyRelatingtoWaterD1193SpecificationforReagentWaterD2687PracticesforSamplingParticulateIon-ExchangeMa-terials3.Terminology3.1Definitions—Fordefinitionsoftermsusedinthesetestmethods,refertoTerminologyD11293.2DefinitionsofTermsSpecifictoThisStandard:3.2.1Certaintermsinthesetestmethodsthatrelatespecifi-callytoionexchangearedefinedasfollows:3.2.2freemineralacidity—thequantitativecapacityofaqueousmediatoreactwithhydroxylionstopH4.3.3.2.3hydrogencycle—theoperationofacation-exchangecyclewhereintheremovalofspecifiedcationsfrominfluentwaterisaccomplishedbyexchangewithanequivalentamountofhydrogenionfromtheexchangematerial.3.2.4theoreticalfreemineralacidity—thefreemineralacid-itythatwouldresultfromtheconversionoftheanionsofstrongacidsinsolutiontotheirrespec...
