Designation:D6731−22StandardTestMethodforDeterminingtheAerobic,AquaticBiodegradabilityofLubricantsorLubricantComponentsinaClosedRespirometer1ThisstandardisissuedunderthefixeddesignationD6731;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversaprocedurefordeterminingthedegreeofbiodegradabilityoflubricantsortheircomponentsinanaerobicaqueousmediumonexposuretoaninoculumundercontrolledlaboratoryconditions.Thistestmethodisanulti-matebiodegradationtestthatmeasuresoxygendemandinaclosedrespirometer.1.2Thistestmethodissuitableforevaluatingthebiodeg-radationofvolatileaswellasnonvolatilelubricantsorlubri-cantcomponents.1.3Thistestmethodisapplicabletolubricantsandlubricantcomponentswhicharenottoxicandnotinhibitorytothetestmicroorganismsatthetestconcentration.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.SpecifichazardsaregiveninSection10.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D1129TerminologyRelatingtoWaterD1193SpecificationforReagentWaterD1293TestMethodsforpHofWaterD4175TerminologyRelatingtoPetroleumProducts,LiquidFuels,andLubricantsD4447GuideforDisposalofLaboratoryChemicalsandSamplesD6384TerminologyRelatingtoBiodegradabilityandEco-toxicityofLubricantsE...
