Designation:D3989−01(Reapproved2012)StandardTestMethodforTotalRareEarthMetalsinPaintDriersbyEDTAMethod1ThisstandardisissuedunderthefixeddesignationD3989;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthetitrimetricdeterminationofrareearthmetalsinliquidrareearthmetaldriersandutilizesthedisodiumsaltofethylenediaminetetraaceticaciddihydrate(EDTA).1.2Thistestmethodislimitedtothedeterminationoftherareearthmetalcontentofaliquidrareearthmetaldrierthatdoesnotcontainotherdrierelements.Themethodisnotapplicabletodrierblends.1.3Thistestmethodhasbeentestedinconcentrationsof6%ceriumand6%rareearthmetals,butthereisnoreasontobelievethatitisnotsuitableforhigherorlowerdriermetalconcentrationsprovidedspecimensizeisadjustedaccordingly.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D600SpecificationforLiquidPaintDriersD1193SpecificationforReagentWaterE180PracticeforDeterminingthePrecisionofASTMMethodsforAnalysisandTestingofIndustrialandSpe-cialtyChemicals(Withdrawn2009)3E300PracticeforSamplingIndustrialChemicals3.SummaryofTestMethod3.1AdilutedsolutionofthedrieriscomplexedwithanexcessofEDTA,thepHadjustedto5.0,andthentitratedwithzincchloridesolutiontoaxylenolorangeendpoint.4.SignificanceandUse4.1Thistestmethodmaybeusedtoconfirmthestatedcontentofapure,liquidrareearthmetaldriermanufacturedforuseinthecoatingsindustry.5.Interferences5.1CalciumdoesnotinterfereatlowpH.5.2AllothercationsthatcanbetitratedwithEDTAinacidicmedia...
