Designation:C867−94(Reapproved2014)StandardTestMethodforSolubleSulfateinCeramicWhitewareClays(PhotometricMethod)1ThisstandardisissuedunderthefixeddesignationC867;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofsolublesulfateionspresentinwaterorafiltratebymeansofaphotometermeasuringtheturbidityofprecipitatedbariumsulfate.Amethodofstandardizingthephotometerforthistestmethodisalsogiven.1.2Solublesulfateionsmayberemovedfromclaysorclay-waterslurriesbyleachingwithwaterduringmixingandsubsequentfilterpressing.Toremoveallthesulfateionswouldrequireanimpracticalnumberofwashings;therefore,thistestmethodshouldbeconsideredacontroltestandnotaquanti-tativeanalysisforSO4ions.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C324TestMethodforFreeMoistureinCeramicWhitewareClaysD1193SpecificationforReagentWater2.2AmericanChemicalSocietyDocument:SpecificationforReagentChemicals33.Apparatus3.1Balance,accurateto0.0001g.3.2High-SpeedMixer.3.3FilterPress,capableofoperatingat690kPa(100psi).3.4GlassBeakers,ErlenmeyerFlasks.3.5TransferPipets.3.6Spectrophotometerandaccessories.3.7MeasuringSpoon,toholdapproximately0.2gofBaCl2orTHQCup.3.8Otherusuallaboratoryequipment,includingtimers,etc.4.Reagents4.1PurityofReagents—Reagentgradechemicalsshallbeusedinalltests.Unlessotherwiseindicated,itisintendedthatallreagentsshallconformtothespecificationsoftheCommit-teeonAnalyticalReagentsoftheAmericanChemicalSociety,wheresuchspecificationsareavailable.4Othergradesmaybeused,provideditisfirstascertainedthattheregentisofsufficien...
