Designation:D7948−20StandardTestMethodforMeasurementofRespirableCrystallineSilicainWorkplaceAirbyInfraredSpectrometry1ThisstandardisissuedunderthefixeddesignationD7948;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisstandardspecifiesatestmethodforcollectionandanalysisofsamplesofairborneparticulatematterformeasure-mentofrespirablecrystallinesilicabyinfrared(IR)spectrom-etry.1.2Thistestmethodisapplicabletotheanalysisofcrystal-linesilica(thepolymorphsquartz,cristobaliteandtridymite)overaworkingrangeof0.025to0.4mg/m3fora400Lairsampleor0.02to0.25mg/m3fora1000Lairsample,dependingontheanalyticalmethod.1.3Themethodologyisapplicabletopersonalsamplingoftherespirablefractionofairborneparticlesandtostatic(area)sampling.1.4Thistestmethoddescribesthreedifferentproceduresforsamplepreparationandinfraredanalysisofairbornecrystallinesilicasamples,whicharedelineatedinAnnexA1–AnnexA3,respectively:(1)apotassiumbromide(KBr)discIRmeasure-mentmethod,(2)indirectIRanalysisafterredepositionontoafilterusedformeasurement,and(3)directon-filterIRanalysis.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.7Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D1356TerminologyRelatingtoSamplingandAnalysisof...
