Designation:D7521−22StandardTestMethodforDeterminationofAsbestosinSoil1ThisstandardisissuedunderthefixeddesignationD7521;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversaprocedureto:(1)identifyasbestosinsoil,(2)provideanestimateoftheconcentrationofasbestosinthesampledsoil(dried),and(3)optionallytoprovideaconcentrationofasbestosreportedasthenumberofasbestosstructurespergramofsample.1.2Inthistestmethod,resultsareproducedthatmaybeusedforevaluationofsitescontaminatedbyconstruction,mineandmanufacturingwastes,depositsofnaturaloccurrencesofasbestos(NOA),andothersourcesofinteresttotheinvestiga-tor.1.3Thistestmethoddescribesthegravimetric,sieve,andotherlaboratoryproceduresforpreparingthesoilforanalysisaswellastheidentificationandquantificationofanyasbestosdetected.Piecesofcollectedsoilandmaterialembeddedthereinthatpassthrougha19-mmsievewillbecomepartofthesamplethatisanalyzedandforwhichresultsarereported.1.3.1Asbestosisidentifiedandquantifiedbypolarizedlightmicroscopy(PLM)techniquesincludinganalysisofmorphol-ogyandopticalproperties.Optionaltransmissionelectronmicroscopy(TEM)identificationandquantificationofasbestosisbasedonmorphology,selectedareaelectrondiffraction(SAED),andenergydispersiveX-rayanalysis(EDXA).Someinformationaboutfibersizemayalsobedetermined.ThePLMandTEMmethodsusedifferentdefinitionsandsizecriteriaforfibersandstructures.Separatedatasetsmaybeproduced.1.4Thistestmethodhasananalyticalsensitivityof0.25%byweightwithoptionalprocedurestoallowforananalyticalsensitivityof0.1%byweight.1.5Thistestmethoddoesnotpurporttoaddresssamplingstrategiesorvariablesassociatedwithsoilenvironments.Suchconsiderationsaretheresponsibilityoftheinvestigatorcollect-ingandsubmittingthesample.AppendixX2coveringele-mentsofsoilsamplingandgoodfieldpractices...
