ASTMD522392O7595300508274237m(#Designation:D5221-92AMERICANSOCIETYFORTESTINGANDMATERIALS1916RaceStPhiladelphia,Pa19103ReprintedfromtheAnnualBookofASTMStandards.CopyrightASTMIfnotlistedinthecurrentcombinadindex,willappearinthenexiedition.StandardTestMethodforContinuousMeasurementofFormaldehydeinAir'ThisstandardisissuedunderthefixeddesignationD5221;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision.theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuprscriptepsilon(t)indicaiesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.IThistestmethodcoversthecontinuousmeasurementofformaldehydevaporinindoororoutdooratmospheres.I.2Thistestmethodemploysanautomatedwet-chemicalcolorimetricanalyzerwithacontinuoussignaloutput.I.3Thecommercialanalyzerhasbeenmodifiedsuchthatformaldehydevaporisabsorbedinacidified(HCl)pararosanilinewithsubsequentadditionofdilutesodiumsulfite.,Theresultingcoloredproducthasastrongabsorptionbandinthevisibleregion(530to600nm).1.4Thistestmethodisapplicabletoconcentrationsofformaldehydefrom10to500pg/m3.Detectionlimitsaredependentonsampleairflowrate(maximum1.0L/min).1.5ThevaluesstatedinSIunitsaretoberegardedasthestandard.Theinch-poundunitsgiveninparenthesesareforinformationonly.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyproblems,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Specificprecau-tionarystatementsaregiveninNote1.2.ReferencedDocuments2.1ASTMStandards:DI193SpecificationforReagentWate9DI356TerminologyRelatingtoAtmosphericSamplingD1605PracticesforSamplingAtmospheresforAnalysisD3249PracticeforGeneralAmbientAirAnalyzerD3609PracticeforCalibrationTechniquesUsingPerme-andAnalysis2ofGasesandVapors2Procedures2ationTubesz3.Terminology3.1DeJinilions:3.1.1Fordefinitionsoftermsusedinthistestmethod,3.2DescriptionsofTermsSpecifictoThisStandard...
