Designation:D2193−06(Reapproved2012)StandardTestMethodforHydroquinoneinVinylAcetate1ThisstandardisissuedunderthefixeddesignationD2193;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedeterminationofhydroqui-noneintherangefrom1to20ppminrefined,commerciallyavailable,vinylacetate.1.2Forpurposesofdeterminingconformanceofanob-servedoracalculatedvalueusingthistestmethodtorelevantspecifications,testresult(s)shallberoundedoff“tothenearestunit”inthelastright-handdigitusedinexpressingthespecificationlimit,inaccordancewithPracticeE29.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.1.5Forhazardinformationandguidance,seethesupplier’sMaterialSafetyDataSheet.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWaterE29PracticeforUsingSignificantDigitsinTestDatatoDetermineConformancewithSpecifications3.SummaryofTestMethod3.1Thevinylacetateisevaporatedatroomtemperatureinastreamofinertgasorcleanairtominimizethelossofhydroquinonebyevaporation.Thehydroquinoneisdissolvedinwaterandtitratedwithdilutestandardizedcericacidsulfateusingdiphenylamineasindicator.4.SignificanceandUse4.1Thistestmethodprovidesameasurementofinhibitorlevelinvinylacetate.Theresultsofthesemeasurementscanbeusedforspecificationacceptance.5.Apparatus5.1Buret,25-mL,graduatedin0.1-mLsubdivisions.5.2Beakers,50and600-mLcapacity.5.3VolumetricFlask,1000-mLcapacity.5.4ErlenmeyerFlasks,100and250-mLcapacity.5.5NitrogenCylinder,orsourceofcleanair.5.6Pipets,10and50-mLcapacity.6.Rea...
