Designation:D7303−17StandardTestMethodforDeterminationofMetalsinLubricatingGreasesbyInductivelyCoupledPlasmaAtomicEmissionSpectrometry1ThisstandardisissuedunderthefixeddesignationD7303;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedeterminationofanumberofmetalssuchasaluminum,antimony,barium,calcium,iron,lithium,magnesium,molybdenum,phosphorus,silicon,sodium,sulfur,andzincinunusedlubricatinggreasesbyinductivelycoupledplasmaatomicemissionspectrometry(ICP-AES)technique.1.1.1Therangeofapplicabilityforthistestmethod,basedontheinterlaboratorystudyconductedin2005,2isaluminum(10to600),antimony(10to2300),barium(50to800),calcium(20to50000),iron(10to360),lithium(300to3200),magnesium(30to10000),molybdenum(50to22000),phosphorus(50to2000),silicon(10to15000),sodium(30to1500),sulfur(1600to28000),andzinc(300to2200),allinmg/kg.Lowerlevelsofelementsmaybedeterminedbyusinglargersampleweights,andhigherlevelsofelementsmaybedeterminedbyusingsmalleramountsofsampleorbyusingalargerdilutionfactoraftersampledissolution.However,thetestprecisioninsuchcaseshasnotbeendetermined,andmaybedifferentthantheonesgiveninTable1.1.1.2Itmayalsobepossibletodetermineadditionalmetalssuchasbismuth,boron,cadmium,chromium,copper,lead,manganese,potassium,titanium,etc.bythistechnique.However,notenoughdataisavailabletospecifytheprecisionfortheselatterdeterminations.Thesemetalsmayoriginateintogreasesthroughcontaminationorasadditiveelements.1.1.3Duringsamplepreparation,thegreasesamplesaredecomposedwithavarietyofacidmixture(s).Itisbeyondthescopeofthistestmethodtospecifyappropriateacidmixturesforallpossiblecombinationofmetalspresentinthesample.Butiftheashdissolutionresultsinanyvisibleinsolublematerial,thetestmethodmaynotbeapplicableforthetypeofgreasebeinganalyzed,assumingtheins...
