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PotassiumnitrateEUROPEANPHARMACOPOEIA7.0Wavelength:248.3nm.TESTSAtomisationdevice:air-acetyleneflame.SolutionS.Dissolve10.0gincarbondioxide-freewaterRSelenium:maximum10ppm.preparedfromdistilledwaterRanddiluteto100mLwiththesamesolvent.To3.0gadd10mLofformaldehydeR.Carefullyadd2mLofAppearanceofsolution.SolutionSisclear(2.2.1)andhydrochloricacidRinsmallportions.Heatonawater-bathforcolourless(2.2.2,MethodII).20min.AnypinkcolourinthesolutionisnotmoreintensethanthatofareferencesolutionpreparedatthesametimeinAcidityoralkalinity.To10mLofsolutionSadd0.05mLthesamemannerusing1.0gofthesubstancetobeexaminedofbromothymolbluesolutionR1.Notmorethan0.5mLtowhich0.2mLofseleniumstandardsolution(100ppmSe)Rof0.01Mhydrochloricacidor0.01Msodiumhydroxideishasbeenadded.requiredtochangethecolouroftheindicator.Zinc:maximum25ppm.Reduciblesubstances.To10mLofsolutionS,add0.5mLofdilutesulfuricacidRand2mLofzinciodideandstarchAtomicabsorptionspectrometry(2.2.23,MethodI).solutionR.Thesolutiondoesnotbecomebluewithin2min.Testsolution.Dilute20mLofsolutionSto50mLwithwaterR.Chlorides(2.4.4):maximum20ppm,ifintendedforophthalmicReferencesolutions.Preparethereferencesolutionsusinguse.zincstandardsolution(100ppmZn)R,dilutedasnecessaryDissolve2.5ginwaterRanddiluteto15mLwiththesamewithwaterR.solvent.Source:zinchollow-cathodelamp.Sulfates(2.4.13):maximum150ppm.Wavelength:213.9nm.Dilute10mLofsolutionSto15mLwithdistilledwaterR.Atomisationdevice:air-acetyleneflame.Ammonium(2.4.1):maximum100ppm,determinedin1mLofsolutionS;maximum50ppmifintendedforophthalmicuse.Heavymetals(2.4.8):maximum10ppm.Calcium(2.4.3):maximum100ppm;maximum50ppmifIntroduce40mLofsolutionSintoasilicacrucible,add10mLintendedforophthalmicuse.ofhydrochloricacidRandevaporatetodryness.Dissolvetheresiduein19mLofwaterRandadd1mLofa40g/LsolutionDilute10mLofsolutionSto15mLwithdistilledwaterR.ofsodiumfluorideR.ThesolutioncomplieswithtestE.Iron(2.4.9):maximum20ppm;maximum10ppmifintendedPreparethereferencesolutionusing20mLofleads
