Designation:D6552−06(Reapproved2021)StandardPracticeforControllingandCharacterizingErrorsinWeighingCollectedAerosols1ThisstandardisissuedunderthefixeddesignationD6552;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Assessmentofairborneaerosolhazardsintheoccupa-tionalsettingentailssamplingontoacollectionmediumfollowedbyanalysisofthecollectedmaterial.Theresultisgenerallyanestimatedconcentrationofapossiblyhazardousmaterialintheair.Theuncertaintyinsuchestimatesdependsonseveralfactors,oneofwhichrelatestothespecifictypeofanalysisemployed.Themostcommonlyappliedmethodforanalysisofaerosolsistheweighingofthesampledmaterial.Gravimetricanalysis,thoughapparentlysimple,issubjecttoerrorsfrominstabilityinthemassofthesamplingmediumandotherelementsthatmustbeweighed.Anexampleisprovidedbyaerosolsamplersdesignedtocollectparticlessoastoagreewiththeinhalableaerosolsamplingconvention(seeISO7708,GuideD6062,andEN481).Forsomesamplertypes,filterandcassetteareweighedtogethertomakeestimates.Therefore,ifthecassette,forexample,absorbsorloseswaterbetweentheweighingsrequiredforaconcentrationestimation,thenerrorsmayarise.Thispracticecoverssuchpotentialerrorsandprovidessolutionsfortheirminimization.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTrade...
