Designation:D6423−14StandardTestMethodforDeterminationofpHeofDenaturedFuelEthanolandEthanolFuelBlends1ThisstandardisissuedunderthefixeddesignationD6423;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversaproceduretodetermineameasureoftheacidstrengthofhighethanolcontentfuels.Theseincludedenaturedfuelethanolandethanolfuelblends.Thetestmethodisapplicabletodenaturedfuelethanolandethanolfuelblendscontainingethanolat51%byvolume,ormore.1.2AcidstrengthasmeasuredinthistestmethodisdefinedaspHe.ApHevalueforalcoholsolutionsisnotcomparabletopHvaluesofwatersolutions.1.2.1ThevalueofpHemeasuredwilldependsomewhatonthefuelblend,thestirringrate,andthetimetheelectrodeisinthefuel.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3.1HydrogenionactivityinwaterisexpressedaspHandhydrogenionactivityinethanolisexpressedaspHe.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWaterD4175TerminologyRelatingtoPetroleum,PetroleumProducts,andLubricantsD4806SpecificationforDenaturedFuelEthanolforBlend-ingwithGasolinesforUseasAutomotiveSpark-IgnitionEngineFuelD5798SpecificationforEthanolFuelBlendsforFlexible-FuelAutomotiveSpark-IgnitionEngines3.Terminology3.1Forgeneralterminology,refertoTerminologyD4175.3.2Definitions:3.2.1denaturants,n—materialsaddedtoethanoltomakeitunsuitableforbeverageuseunderaformulaapprovedbyaregulatoryagencytopreventtheimpositionofbeveragealcoholtax.D48063.2.1.1Discussion—Denaturantsareonlythosematerialsaddedbythedenaturertocomplyw...
