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1、DIMETHYLDICARBONATEPreparedatthe37thJECFA(1990),publishedinFNP52(1990).Metalsandarsenicspecificationsrevisedatthe63rdJECFA(2004).ConsideredtobeacceptableinaccordancewithGMP(max250mg/l)atthe37thJECFA(1990)SYNONYMSDMDC,dimethylpyrocarbonate;INSNo.242DEFINITIONChemicalnamesDimethyldicarbonateC.A
2、.S.number004-525-33-1ChemicalformulaC4H6O5StructuralformulaFormulaweight139.09AssayNotlessthan99.8%DESCRIPTIONColourlessliquid.Caution:Corrosivetoeyesandskinandtoxicbyinhalationandingestion;mustbekeptinatightlysealedcontainertoexcludemoisture.FUNCTIONALUSESPreservativeCHARACTERISTICSIDENTIFIC
3、ATIONSolubility(Vol.4)Solubleinwaterwithdecomposition;misciblewithtolueneInfraredabsorptionTheinfraredspectrumofthesamplecorrespondswiththereferenceinfraredspectrumbelowPURITYDimethylcarbonateNotmorethan0.2%SeedescriptionunderTESTSLead(Vol.4)Notmorethan2mg/kgDetermineusinganatomicabsorptionte
4、chniqueappropriatetothespecifiedlevel.TheselectionofsamplesizeandmethodofsamplepreparationmaybebasedontheprinciplesofthemethoddescribedinVolume4,“InstrumentalMethods.”TESTSPURITYTESTSDimethylcarbonateApparatusGaschromatographwithaflameionizationdetector,equippedforcapillarygaschromatography,a
5、ndinletpartforthe"oncolumn"technique(e.g.,CarloErbaFraktovap4160,orHewlett-Packard5880or5792).-Capillary:50mSE30-D(internaldiameter:0,3mm).-Potentiometricrecorder,1mV.-Microlitersyringeswithquartzneedles,contents0,010ml,suitableforthe"oncolumn"technique(e.g.,microlitersyringefromSGE,type5A-SO
6、C),(SeeRemark5below).Rolledrimglassvial,10mlcontent.-Sealcapfortherolledrimvialwithtefloncoating.-Closuretongsfortherolledrimvial-Auxiliaryforthepeakareadetermination(e.g.HPcalculator3353).ReagentsMethylisobutylketone,purestgrade.OperatingconditionsTemperatures:o-Injectionblock:Roomtemperatur
7、e(approximately25)o-Detector:200o-CapillaryTube:Initialtemperature30;Preliminaryphase5min,Rateofooascent40/min;Finaltemperature120,Finalphase5minCarriergas:-Preliminarypressure:3.0bar(Helium)-Capillarytubes:Approx.11ml/min-Make-upgas:28ml/min
