Designation:D2896−21StandardTestMethodforBaseNumberofPetroleumProductsbyPotentiometricPerchloricAcidTitration1ThisstandardisissuedunderthefixeddesignationD2896;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thistestmethodcoversthedeterminationofbasicconstituentsinpetroleumproductsbytitrationwithperchloricacidinglacialaceticacid.1.2ProceduresAandBusedifferenttitrationsolventvolumesandsampleweights.NOTE1—Aroundrobinonaseriesofnewandusedoilsandadditiveconcentrateshasshownthatthetwoproceduresgivestatisticallyequiva-lentresults.1.3AppendixX2providestheuseofanalternativesolventsystemwhicheliminatestheuseofchlorobenzeneinthistestmethod.Theuseofthealternativesolventgivesstatisticallyequivalentresults;however,theprecisionisworse.ParagraphX2.5.5providesguidancewhencomparingresultsusingthetwodifferentsolvents.1.4Theconstituentsthatmaybeconsideredtohavebasiccharacteristicsincludeorganicandinorganicbases,aminocompounds,saltsofweakacids(soaps),basicsaltsofpoly-acidicbases,andsaltsofheavymetals.NOTE2—ThistestmethodisapplicabletobothfreshoilsandusedoilsasdescribedinSections16,17,and19andAppendixX1.1.5Thistestmethodcanbeusedtodeterminebasenumber>300mgKOH/g.However,theprecisionstatementinSection19hasbeenobtainedonlyonbasenumber≤300mgKOH/g.1.6ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.7Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.Forspecificwarningstatements,seeSection7,Section10,andX2.2.1.8Thisinternationalstandardwasdevelope...
