Designation:D6384−11StandardTerminologyRelatingtoBiodegradabilityandEcotoxicityofLubricants1ThisstandardisissuedunderthefixeddesignationD6384;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisterminologycoversdefinitionsrelatingtobiode-gradabilityandecotoxicityoflubricants.2.ReferencedDocuments2.1ASTMStandards:2D5864TestMethodforDeterminingAerobicAquaticBio-degradationofLubricantsorTheirComponentsD6139TestMethodforDeterminingtheAerobicAquaticBiodegradationofLubricantsorTheirComponentsUsingtheGledhillShakeFlask3.Terminologyactivatedsludge,n—theprecipitatedsolidmatter,consistingmainlyofbacteriaandotheraquaticmicrorganisms,thatisproducedatadomesticwastewatertreatmentplant;activatedsludgeisusedprimarilyinsecondarysewagetreatmenttomicrobiallyoxidizedissolvedorganicmatterintheeffluent.D6139acuteecotoxicity,n—thepropensityofatestmaterialtoproduceadversebehavioral,biochemical,orphysiologicaleffectsinnon-humanorganismsorpopulationsinashortperiod,usuallynotconstitutingasubstantialportionofthelifespan.acuteecotoxicitytest,n—acomparativeecotoxicitytestinwhicharepresentativesubpopulationoforganismsisex-posedtodifferenttreatratesofatestmaterialandisobservedforashortperiod,usuallynotconstitutingasubstantialportionoftheirlifespan.aerobic,adj—(1)takingplaceinthepresenceofoxygen;(2)livingoractiveinthepresenceofoxygen.D6139biodegradation,n—theprocessofchemicalbreak-downortransformationofasubstancecausedbyorganismsortheirenzymes.D5864biomass,n—biologicalmaterialincludinganymaterialotherthanfossilfuelswhichisorwasalivingorganismorcomponentorproductofalivingorganism.DISCUSSION—Inbiologyandenvironmentalscience,biomassistypicallyexpressedasdensityofbiologicalmaterialperunitsamplevolume,area,ormass(gbiomass/g(or/mLor/cm2)sample);whenusedforproductsderivedfromorga...
