Designation:D1224–92(Reapproved2006)AnAmericanNationalStandardStandardTestMethodsforZincandCadmiuminPaper1ThisstandardisissuedunderthefixeddesignationD1224;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesetestmethodscoverthedeterminationofcadmiumandzinceitherinpaperorinhighlyopaquepigments.1.2Thetestmethodsappearasfollows:SectionMethodA—Polarographic5MethodB—GravimetricandVolumetric6MethodC—AtomicAbsorption71.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C322PracticeforSamplingCeramicWhitewareClaysD585PracticeforSamplingandAcceptingaSingleLotofPaper,Paperboard,Fiberboard,andRelatedProductD644TestMethodforMoistureContentofPaperandPaperboardbyOvenDrying3.SummaryofTestMethods3.1Threetestmethodsforeachelementaredescribed:polarographic,eithergravimetricorvolumetric,andatomicabsorption.Thegravimetricprocedureissuitableifapo-larographisnotavailable.Forthedeterminationofzincinazinc-bearingpigment,thevolumetricprocedureisrecom-mended,becausethepolarographicprocedureisinsensitiveover25%inlevels.Thepolarographicprocedurecanbeusedforthedeterminationofzincandcadmiuminpaperandforcadmiumincadmium-bearingpigments.Thepreferredmethodforeachmaterialisbasedonitsconcentrationandontheavailabilityofequipment.3.2Whenzincistobedeterminedvolumetrically(cadmiumabsent)oneprecipitationofheavymetalswithwashingissufficient.3.3Intheatomicabsorptionproceduresensitivitiesfor1%absorptionare0.02mg/cm3Znand0.03mg/cm3Cd,respec-tively.Therepeatabilityofthismethodisquestionableatpresentforzincandcadmiumconcentrationsofgreaterthan5%.4.SignificanceandUs...
