Designation:D4599−21StandardPracticeforMeasuringtheConcentrationofToxicGasesorVaporsUsingLength-of-StainDosimeters1ThisstandardisissuedunderthefixeddesignationD4599;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticedescribesthedetectionandmeasurementoftimeweightedaverage(TWA)concentrationsoftoxicgasesorvaporsusinglength-of-staincolorimetricdosimetertubes.AlistofsomeofthegasesandvaporsthatcanbedetectedbythispracticeisprovidedinAppendixX1.Thislistisgivenasaguideandshouldbeconsideredneitherabsolutenorcomplete.1.2Length-of-staincolorimetricdosimetersworkbydiffu-sionalsampling.Theresultsareimmediatelyavailablebyvisualobservation;thusnoauxiliarysampling,test,noranaly-sisequipmentareneeded.Thedosimeters,therefore,areextremelysimpletouseandverycosteffective.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D1356TerminologyRelatingtoSamplingandAnalysisofAtmospheres2.2OtherDocument:3U.S.OccupationalSafetyandHealthStandard—Title291910.1000,SubpartZ3.Terminology3.1Definitions—Fordefinitionsoftermsusedinthispractice,refertoTerminologyD1356.4.SummaryofPractice4.1Length-of-staincolorimetricdosimetersconsistofasealedglasstubecon...
