Designation:D7201−06(Reapproved2011)StandardPracticeforSamplingandCountingAirborneFibers,IncludingAsbestosFibers,intheWorkplace,byPhaseContrastMicroscopy(withanOptionofTransmissionElectronMicroscopy)1ThisstandardisissuedunderthefixeddesignationD7201;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispractice2describesthedeterminationofthecon-centrationoffibers,expressedasthenumberofsuchfiberspermillilitreofair,usingphasecontrastmicroscopyandoptionallytransmissionelectronmicroscopytoevaluateparticulatemate-rialcollectedonamembranefilterinthebreathingzoneofanindividualorbyareasamplinginaspecificlocation.ThispracticeisbasedonthecoreproceduresprovidedintheInternationalOrganizationforStandardization(ISO)StandardISO8672(1)3,theNationalInstituteforOccupationalandHealth(NIOSH)ManualofAnalyticalMethods,NIOSH7400(2),andtheOccupationalSafetyandHealthAdministration(OSHA)MethodID160(3).Thispracticeindicatestheimpor-tantpointswherethesemethodsdiffer,andprovidesinforma-tionregardingthedifferences,whichwillallowtheusertoselectthemostappropriateprocedureforaparticularapplica-tion.However,selectingportionsofproceduresfromdifferentpublishedmethodsgenerallyrequiresausertoreportthattheyhaveusedamodificationtoamethodratherthanclaimtheyhaveusedthemethodaswritten.1.2Thepracticeisusedforroutinedeterminationofanindexofoccupationalexposuretoairbornefibersinwork-places.Workplacesareconsideredthoseplaceswhereworkersareexposedtoairbornefibersincludingasbestos.Additionalinformationonsamplingstrategies,samplecollection(includ-ingcalibration)anduseofsampleresultsforasbestosabate-mentprojectsisprovidedinastandardPracticeforAirMonitoringforManagementofAsbestos-ContainingMaterials(WK8951)currentlybeingconsideredbyASTMsubcommit-teeE06.24.Afurtherpracticehasbeenapprovedforthespecific...
