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1、AZODICARBONAMIDEPreparedatthe19thJECFA(1975),publishedinNMRS55B(1976)andinFNP52(1992).Metalsandarsenicspecificationsrevisedatthe63rdJECFA(2004)Anacceptableleveloftreatmentof0-45mg/kgwasestablishedatthe9thJECFA(1965)SYNONYMSAzobisformamide;INSNo.927aDEFINITIONChemicalnamesAzodicarbonamide
2、,azodicarboxylicaciddiamideC.A.S.number123-77-3ChemicalformulaC2H4N4O2StructuralformulaFormulaweight116.08AssayNotlessthan98.6%;notlessthan47.2%andnotmorethan48.7%ofNonthedriedbasisDESCRIPTIONYellowtoorange-red,odourless,crystallinepowderFUNCTIONALUSESMaturingagentforflourCHARACTERISTICS
3、IDENTIFICATIONSolubility(Vol.4)Practicallyinsolubleinwaterandinethanol;slightlysolubleindimethylsulfoxideMeltingrange(Vol.4)Above180owithdecompositionTestforoxidationLiberatesiodinefrompotassiumiodideTSsolutioninthepresenceof10%sulfuricacidTestforcarbondioxideHeatabout10mgofthesampleinac
4、rucible.AdropofbariumhydroxidesolutionheldabovethesamplebymeansofaglassrodbecomesturbidPURITYLossondrying(Vol.4)Notmorethan0.5%(50o,2hinvacuo)pH(Vol.4)Notlessthan5.0(1in50suspensionmadebyadding2gofsampleto100mlofwaterandagitatingthemixturewithapowerstirrerfor5min).Sulfatedash(Vol.4)Notmo
5、rethan0.15%Test1.5gofthesample(MethodI)Lead(Vol.4)Notmorethan2mg/kgDetermineusinganatomicabsorptiontechniqueappropriatetothespecifiedlevel.TheselectionofsamplesizeandmethodofsamplepreparationmaybebasedontheprinciplesofthemethoddescribedinVolume4,“InstrumentalMethods.”METHODOFTitrimetricm
6、ethod/azodicarbonamide:ASSAYTransferabout225mgoftheaccuratelyweighedsample,previouslydriedinaovacuumovenat50for2h,intoa250-mlglass-stopperediodineflask.Addabout23mlofdimethylsulfoxidetotheflask,washinganyadheredsampledownwiththesolvent,stoppertheflask,andplaceabout2mlofthesolventinthecup
7、orlipoftheflask.Swirloccasionallyuntilcompletesolutionofthesampleiseffected,andthenloosenthestoppertodraintheremainderofsolventintotheflaskandtorinsedownanydissolvedsampleintothesolution.Add5gofpotassiumiodidefollowedby15mlofwater,immediatelypipet10mlof0.5Nhydrochloricaci
