Designation:D4370−01(Reapproved2012)StandardTestMethodsforAcidandBaseMilliequivalentContentofElectrocoatBath1ThisstandardisissuedunderthefixeddesignationD4370;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesetestmethodscoverthedeterminationofacidandbasemilliequivalentcontentsofanodicandcathodicelectro-coatbathsandtheirultrafiltrates.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWater3.SummaryofTestMethods3.1Specimensaretitratedwithstandardacidandalkalisolutionsrespectively.AlternativeproceduresaregivenfordeterminingacidandbaseconcentrationspotentiometricallyorusingapHmeter.4.SignificanceandUse4.1Theacidandbaseconcentrationsareameasurementofthetitratableacidicandalkalinecomponentsintheelectrocoatbaths.Thesemeasurementsareusedforresearch,productionorelectrocoatbathprocesscontrol.5.Apparatus5.1AutomaticPotentiometricTitratorwithStirrerandRecorder,anymodel.5.2AnalyticalBalance,withsensitivityof0.1mg.5.3pHMeter,anymodel.5.4GlassandSaturatedCalomelElectrodes.5.5Syringes,5-mLdisposable.6.Reagents6.1PurityofReagents—Reagentgradechemicalsshallbeusedinalltests.Unlessotherwiseindicated,itisintendedthatallreagentsshallconformtothespecificationsoftheCommit-teeonAnalyticalReagentsoftheAmericanChemicalSociety,wheresuchspecificationsareavailable.3Othergradesmaybeused,provideditisascertainedthatthereagentisofsufficientlyhighpuritytopermititsusewithoutlesseningtheaccuracyofthedetermination.6.2Purityo...
