【英文标准名称】:StandardTestMethodforMicrovacuumSamplingandIndirectAnalysisofDustbyTransmissionElectronMicroscopyforAsbestosStructureNumberSurfaceLoading
【原文标准名称】:用石棉结构值表面负荷用透射电子显微镜对尘埃微真空取样和间接分析的标准试验方法
【标准号】:ASTMD5755-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【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;microvacuuming;settleddust;TEM;Microscopicexamination--atmospheric;Microvacuumsampling;Morphology;Samplingair/atmosphericmaterials/applications;Selectedareaelectrondiffraction(SAED);Settleddust;TEM(transmissionelectronmi
【摘要】:Thismicrovacuumsamplingandindirectanalysismethodisusedforthegeneraltestingofnon-airbornedustsamplesforasbestos.Itisusedtoassistintheevaluationofdustthatmaybefoundonsurfacesinbuildingssuchasceilingtiles,shelving,electricalcomponents,ductwork,carpet,etc.ThistestmethodprovidesanindexofthesurfaceloadingofasbestosstructuresinthedustperunitareaanalyzedasderivedfromaquantitativeTEManalysis.Thistestmethoddoesnotdescribeproceduresortechniquesrequiredtoevaluatethesafetyorhabitabilityofbuildingswithasbestos-containingmaterials,orcompliancewithfederal,state,orlocalregulationsorstatutes.Itistheuser''sresponsibilitytomakethesedeterminations.Atpresent,norelationshiphasbeenestablishedbetweenasbestos-containingdustasmeasuredbythistestmethodandpotentialhumanexposuretoairborneasbestos.Accordingly,theusersshouldconsiderotheravailableinformationintheirinterpretationofthedataobtainedfromthistestmethod.Thisdefinitionofdustacceptsallparticlessmallenoughtopassthrougha1mm(No.18)screen.Thus,asingle,largeasbestoscontainingparticle(s)(fromthelargeendoftheparticlesizedistribution)dispersedduringsamplepreparationmayresultinanomalouslylargeasbestossurfaceloadingresultsintheTEManalysesofthatsample.Itis,therefore,recommendedthatmultipleindependentsamplesaresecuredfromthesamearea,andthataminimumofthreesamplesbeanalyzedbytheentireprocedure.1.1Thistestmethodcoversaprocedureto(a)identifyasbestosindustand(b)provideanestimateofthesurfaceloadingofasbestosinthesampleddustreportedasthenumberofasbestosstructuresperunitareaofsampledsurface.1.1.1Ifanestimateoftheasbestosmassistobedetermined,theuserisreferredtoTestMethodD5756.1.2Thistestmethoddescribestheequipmentandproceduresnecessaryforsampling,byamicrovacuumtechnique,non-airbornedustforlevelsofasbestosstructures.Thenon-airbornesampleiscollectedinsideastandardfiltermembranecassettefromthesamplingofasurfaceareafordustwhichmaycontainasbestos.1.2.1Thisprocedureusesamicrovacuumingsamplingtechnique.Thecollectionefficiencyofthistechniqueisunknownandwillvaryamongsubstrates.Propertiesinfluencingcollectionefficiencyincludesurfacetexture,adhesiveness,electrostaticpropertiesandotherfactors.1.3Asbestosidentifiedbytransmissionelectronmicroscopy(TEM)isbasedonmorphology,selectedareaelectrondiffraction(SAED),andenergydispersiveX-rayanalysis(EDXA).Someinformationaboutstructuresizeisalsodetermined.1.4Thistestmethodisgenerallyapplicableforanestimateofthesurfaceloadingofasbestosstructuresstartingfromapproximately1000asbestosstructurespersquarecentimetre.1.4.1Theprocedureoutlinedinthistestmethodemploysanindirectsamplepreparationtechnique.Itisintendedtodisperseaggregatedasbestosintofundamentalfibrils,fiberbundles,clusters,ormatricesthatcanbemoreaccuratelyquantifiedbytransmissionelectronmicroscopy.However,aswithallindirectsamplepreparationtechniques,theasbestosobservedforquantificationmaynotrepresentthephysicalformoftheasbestosassampled.Morespecifically,theproceduredescribedneithercreatesnordestroysasbestos,butitmayalterthephysicalformofthemineralfibers.1.5ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.......
【中国标准分类号】:C51
【国际标准分类号】:13_040_20
【页数】:14P.;A4
【正文语种】:英语
基本信息
| 标准名称： | 长途电话半自动对端设备技术要求和测试方法 |
| 英文名称： | Technical requirements and test methods for semi-automatic toll terminal equipment |
| 中标分类： |
通信、广播 >>
通信设备 >>
数据通信设备 |
| ICS分类： |
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| 替代情况： | 作废; |
| 发布部门： | 信息产业部（通信） |
| 发布日期： | 1987-05-14 |
| 实施日期： | 1988-01-01 |
| 首发日期： | 1987-05-14 |
| 作废日期： | 1900-01-01 |
| 主管部门： | 信息产业部（通信） |
| 归口单位： | 信息产业部（通信） |
| 起草单位： | 上海邮电公司电信设备二厂 |
| 出版日期： | 1900-01-01 |
| 页数： | 0 |
适用范围
本标准适用于长途电话半自动对端设备。该设备作为终端设备用于两城市的长途电话局间，通过长途直达电路，实现长途电话半自动接续，也可经长途电话在交换机纳入全国长途自动电话网。
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所属分类： 通信 广播 通信设备 数据通信设备