FERROCYANIDES of CALCIUM, POTASSIUM and SODIUM-亚铁氰化钙、亚铁氰化钾、亚铁氰化钠.pdf

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1、FERROCYANIDESofCALCIUM,POTASSIUMandSODIUMPreparedatthe17thJECFA(1973),publishedinFNP4(1978)andinFNP52(1992).Metalsandarsenicspecificationsrevisedatthe57thJECFA(2001).AnADIof0-0.025mg/kgbwwasestablishedatthe18thJECFA(1974)SYNONYMSYellowprussiateoflime,potashorso

2、da;hexacyanoferrateofcalcium,potassiumorsodium;INSNo.Calciumsalt538,Potassiumsalt536,Sodiumsalt535DEFINITIONChemicalnamesCalcium(orPotassiumorSodium)ferrocyanide,Calcium(orPotassiumorSodium)hexacyanoferrate(II)C.A.S.number1327-39-5,Calciumsalt13943-58-3,Potassi

3、umsalt13601-19-9,SodiumsaltChemicalformulaCa2Fe(CN)6·12H2OK4Fe(CN)6·3H2ONa4Fe(CN)6·10H2OFormulaweightCalciumsalt508.3Potassiumsalt422.4Sodiumsalt484.1AssayNotlessthan99.0%oftherespectiveferrocyanideDESCRIPTIONYellowcrystalsorcrystallinepowderFUNCTIONALUSESAntic

4、akingagentCHARACTERISTICSIDENTIFICATIONSolubility(Vol.4)Solubleinwater;potassiumandsodiumsaltsareinsolubleinethanolTestforferrocyanideTo10mlofa1%solutionofthesampleadd1mlofferricchlorideTS.Adarkblueprecipitateisformed.(RetainthemixturefortheTestforcalcium).Test

5、forcalcium(Vol.4)PassestestTestthemixturefromtheTestforferrocyanideTestforpotassiumPassestest(Vol.4)Testforsodium(Vol.4)PassestestPURITYCyanideNotdetectableDissolve10mgofcoppersulfateinamixtureof8mlofwaterand2mlofammoniaTS.Wetastripoffilterpaperwiththissolution

6、,andplacethewetpaperinastreamofhydrogensulfide.Whenonedropofa1%solutionofthesampleisplacedonthebrownreagentpaper,awhitecircleshouldnotbeproduced.FerricyanideNotdetectableDissolveabout10mgofthesamplein10mlofwaterandplaceonedropofthissolutiononaspotplate.Addonedr

7、opofa1%solutionofleadnitrate,followedbyafewdropsofasolutionpreparedbysaturatingcold2Naceticacidwithbenzidine.Noblueprecipitateorbluecolorationshouldappear.Arsenic(Vol.4)Notmorethan3mg/kg(MethodII)Lead(Vol.4)Notmorethan5mg/kgDetermineusinganatomicabsorptiontechn

8、iqueappropriatetothespecifiedlevel.TheselectionofsamplesizeandmethodofsamplepreparationmaybebasedontheprinciplesofthemethoddescribedinVolume4,“InstrumentalMethods.”METHODOFW