Designation:D6971−09(Reapproved2014)StandardTestMethodforMeasurementofHinderedPhenolicandAromaticAmineAntioxidantContentinNon-zincTurbineOilsbyLinearSweepVoltammetry1ThisstandardisissuedunderthefixeddesignationD6971;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthevoltammetricdeterminationofhinderedphenolandaromaticamineantioxidantsinneworin-servicetypenon-zincturbineoilsinconcentrationsfrom0.0075mass%uptoconcentrationsfoundinnewoilsbymeasuringtheamountofcurrentflowataspecifiedvoltageintheproducedvoltammogram.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWaterD2272TestMethodforOxidationStabilityofSteamTur-bineOilsbyRotatingPressureVesselD4057PracticeforManualSamplingofPetroleumandPetroleumProductsD4378PracticeforIn-ServiceMonitoringofMineralTur-bineOilsforSteam,Gas,andCombinedCycleTurbinesD6224PracticeforIn-ServiceMonitoringofLubricatingOilforAuxiliaryPowerPlantEquipmentD6810TestMethodforMeasurementofHinderedPhenolicAntioxidantContentinNon-ZincTurbineOilsbyLinearSweepVoltammetry2.2ISOStandards:3ISO6743Part4,Lubricants,IndustrialOils,andRelatedProducts3.SummaryofTestMethod3.1Ameasuredquantityofsampleisdispensedintoavialcontainingameasuredquantityofacetonebasedelectrolytetestsolutionandalayerofsand.Whenthevialisshaken,thehinderedphenolandaromaticamineantioxidantsandothertestsolutionsolubleoilcomponentspresentinthesampleareextractedintothetestsolutionandtheremainingdropletssuspendedinthetestsolutionareagglomeratedbythesand.Thesand/dropletsuspensionisallowedtosettleoutand...
