Designation:D5799−19StandardTestMethodforDeterminationofPeroxidesinButadiene1ThisstandardisissuedunderthefixeddesignationD5799;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedeterminationofperoxidesinbutadiene.1.2Thistestmethodcoverstheconcentrationsrangeof1mg⁄kgto10mg⁄kgasavailableoxygen.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D1265PracticeforSamplingLiquefiedPetroleum(LP)Gases,ManualMethodD3700PracticeforObtainingLPGSamplesUsingaFloat-ingPistonCylinder3.SummaryofTestMethod3.1Aknownmassofthebutadienesampleisplacedinaflaskandevaporated.Theresidueisthenrefluxedwithaceticacidandsodiumiodidereagents.Theperoxidesreacttoliberateiodinewhichistitratedwithstandardsodiumthiosul-fatesolutionusingvisualend-pointdetection.Interferingtracesofironarecomplexedwithsodiumfluoride.4.SignificanceandUse4.1Duetotheinherentdangerofperoxidesinbutadiene,specificationlimitsareusuallysetfortheirpresence.Thistestmethodwillprovidevaluesthatcanbeusedtodeterminetheperoxidecontentofasampleofcommercialbutadiene.4.2Butadienepolyperoxideisaverydangerousproductofthereactionbetweenbutadieneandoxygenthatcanoccur.Theperoxideh...
