Designation:D5185−13´1StandardTestMethodforMultielementDeterminationofUsedandUnusedLubricatingOilsandBaseOilsbyInductivelyCoupledPlasmaAtomicEmissionSpectrometry(ICP-AES)1ThisstandardisissuedunderthefixeddesignationD5185;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.ε1NOTE—Table4waseditoriallycorrectedinApril2014.INTRODUCTIONCostsassociatedwithmaintenanceduetoengineandmachinewearcanbesignificant.Therefore,diagnosticmethodsfordeterminingtheconditionofenginesandothermachinerycanbeimportant.Thistestmethodisintendedtoquantify,forthepurposeofequipmentmonitoring,theconcentrationofmetalsinusedlubricatingoils.Althoughtheprecisionstatementwasdeterminedbyanalyzingavarietyofusedoilsthistestmethodcan,inprinciple,beusedfortheanalysisofunusedoilstoprovidemorecompleteelementalcompositiondatathanTestMethodsD4628,D4927,orD4951.1.Scope*1.1Thistestmethodcoversthedeterminationofadditiveelements,wearmetals,andcontaminantsinusedandunusedlubricatingoilsandbaseoilsbyinductivelycoupledplasmaatomicemissionspectrometry(ICP-AES).Thespecificele-mentsarelistedinTable1.1.2Thistestmethodcoversthedeterminationofselectedelements,listedinTable1,inre-refinedandvirginbaseoils.1.3Foranalysisofanyelementusingwavelengthsbelow190nm,avacuumorinert-gasopticalpathisrequired.Thedeterminationofsodiumandpotassiumisnotpossibleonsomeinstrumentshavingalimitedspectralrange.1.4Thistestmethodusesoil-solublemetalsforcalibrationanddoesnotpurporttoquantitativelydetermineinsolubleparticulates.Analyticalresultsareparticlesizedependent,andlowresultsareobtainedforparticleslargerthanafewmicrometers.21.5Elementspresentatconcentrationsabovetheupperlimitofthecalibrationcurvescanbedeterminedwithadditional,appropriatedilutionsandwithnodegradation...
