ASTM D5756-2002(2008) 用透射电子显微镜对尘埃中石棉块表面负荷作微真空取样和间接分析的标准试验方法

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【英文标准名称】:StandardTestMethodforMicrovacuumSamplingandIndirectAnalysisofDustbyTransmissionElectronMicroscopyforAsbestosMassSurfaceLoading
【原文标准名称】:用透射电子显微镜对尘埃中石棉块表面负荷作微真空取样和间接分析的标准试验方法
【标准号】:ASTMD5756-2002(2008)
【标准状态】:现行
【国别】:美国
【发布日期】:2002
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D22.07
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:asbestos;indirect;mass;microvacuuming;settleddust;TEM;Actinoliteasbestosfibers;Anthophylliteasbestosfibers;Asbestos;Asbestosmasssurfaceloading;TEM(transmissionelectronmicroscopy);Transmissionelectronmicroscopy(TEM);Tremolite
【摘要】:Thismicrovacuumsamplingandindirectanalysismethodisusedforthegeneraltestingofnon-airbornedustsamplesforasbestos.Itisusedtoassistintheevaluationofdustthatmaybefoundonsurfacesinbuildings,suchasceilingtiles,shelving,electricalcomponents,ductwork,carpet,etc.ThistestmethodprovidesanestimateofthemasssurfaceloadingofasbestosinthedustreportedaseitherthemassofasbestosperunitareaorasthemassofasbestospermassofsampleddustasderivedfromaquantitativeTEManalysis.Thistestmethoddoesnotdescribeproceduresortechniquesrequiredtoevaluatethesafetyorhabitabilityofbuildingswithasbestos-containingmaterials,orcompliancewithfederal,state,orlocalregulationsorstatutes.Itistheuser''sresponsibilitytomakethesedeterminations.Atpresent,norelationshiphasbeenestablishedbetweenasbestos-containingdustasmeasuredbythistestmethodandpotentialhumanexposuretoairborneasbestos.Accordingly,theusersshouldconsiderotheravailableinformationintheirinterpretationofthedataobtainedfromthistestmethod.Thisdefinitionofdustacceptsallparticlessmallenoughtopassthrougha1mmscreen.Thus,asingle,largeasbestos-containingparticle(s)(fromthelargeendoftheparticlesizedistribution)disassembledduringsamplepreparationmayresultinanomalouslylargeasbestossurfaceloadingresultsintheTEManalysesofthatsample.Conversely,failuretodisaggregatelargeparticlesmayresultinanomalouslylowasbestosmasssurfaceloadings.Itis,therefore,recommendedthatmultipleindependentsamplesbesecuredfromthesamearea,andthataminimumofthreesamplesbeanalyzedbytheentireprocedure.1.1Thistestmethodcoversaprocedureto(a)identifyasbestosindustand(b)provideanestimateofthesurfaceloadingofasbestosinthesampleddust,reportedaseitherthemassofasbestosperunitareaofsampledsurfaceorasthemassofasbestospermassofsampleddust.1.1.1Ifanestimateofasbestosstructurecountsistobedetermined,theuserisreferredtoTestMethodD5755.1.2Thistestmethoddescribestheequipmentandproceduresnecessaryforsampling,byamicrovacuumtechnique,non-airbornedustforlevelsofasbestos.Thenon-airbornesampleiscollectedinsideastandardfiltermembranecassettefromthesamplingofasurfaceareafordustwhichmaycontainasbestos.1.2.1Thisprocedureusesamicrovacuumingsamplingtechnique.Thecollectionefficiencyofthistechniqueisunknown.Variabilityofcollectionefficiencyforanyparticularsubstrateandacrossdifferenttypesofsubstratesisalsounknown.Theeffectsofsamplingefficiencydifferencesandvariabilityontheinterpretationofdustsamplingmeasurementshavenotbeendetermined.1.3Asbestosidentifiedbytransmissionelectronmicroscopy(TEM)isbasedonmorphology,selectedareaelectrondiffraction(SAED),andenergydispersiveX-rayanalysis(EDXA).Someinformationaboutstructuresizeisalsodetermined.1.4Thistestmethodisgenerallyapplicableforanestimateofthesurfaceloadingofasbestosstartingfromapproximately0.24pgofasbestospersquarecentimetre(assumingaminimumfiberdimensionof0.5x03BC;mby0.025x03BC;m,see17.8),butwillvarywiththeanalyticalparametersnotedin17.8.1.4.1Theprocedureoutlinedinthistestmethodemploysanindirectsamplepreparationtechnique.Itisintendedtodisaggregateanddisperseasbestosintofibrilsandfiberbundlesthatcanbemoreaccuratelyidentified,counted,andsizedbytransmissionelectronmicroscopy.However,aswithalli......
【中国标准分类号】:C51
【国际标准分类号】:13_040_20
【页数】:13P.;A4
【正文语种】:英语