SAE AMS3246 Synthetic Rubber Buna S Type (45-55) (Cancelled May 1956)
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来源:标准资料网
Product Code:SAE AMS3246
Title:Synthetic Rubber Buna S Type (45-55) (Cancelled May 1956)
Issuing Committee:Ams Ce Elastomers Committee
Scope:
【英文标准名称】:StandardPracticeforCollectionofSurfaceDustbyMicro-vacuumSamplingforSubsequentMetalsDetermination
【原文标准名称】:后成金属测定用高真空取样法进行表面灰尘收集的标准实施规程
【标准号】:ASTMD7144-2005a
【标准状态】:现行
【国别】:
【发布日期】:2005
【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】:D22.04
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:分析方法;化学;收集;测定;尘埃;金属;宏观;取样;表面;真空的
【英文主题词】:dust;metals;surfaces;vacuumsampling
【摘要】:Humanexposuretotoxicmetalspresentinsurfacedustcanresultfromdermalcontactwithoringestionofcontaminateddust.Also,inhalationexposurecanresultfromdisturbingdustparticlesfromcontaminatedsurfaces.Thusstandardizedmethodsforthecollectionandanalysisofmetalsinsurfacedustsamplesareneededinordertoevaluatethepotentialforhumanexposuretotoxicelements.Thispracticeinvolvestheuseofsamplingequipmenttocollectsurfacedustsamplesthatmaycontaintoxicmetals,andisintendedforusebyqualifiedtechnicalprofessionals.Thispracticeallowsforthesubsequentdeterminationofcollectedmetalsconcentrationsonanarea(loading)ormassconcentrationbasis,orboth.Becauseparticlelossescanoccurduetocollectionofdustontotheinnersurfacesofthenozzle,thelengthofthecollectionnozzleisspecifiedinorderthatsuchlossesarecomparablefromonesampletoanother.Thispracticeissuitableforthecollectionofsurfacedustsamplesfrom,forexample:(a)soft,poroussurfacessuchascarpetorupholstery;(b)hard,roughsurfacessuchasconcreteorroughenedwood;(c)confinedareasthatcannotbeeasilysampledbyothermeans(suchaswipesamplingasdescribedinPracticeD6966).Acompanionsamplingtechniquethatmaybeusedforcollectionofsurfacedustfromhard,smoothsurfacesiswipesampling(PracticeD6966).AcompanionvacuumsamplingtechniquethatmaybeusedforsamplingcarpetsisdescribedinPracticeD5438.Procedurespresentedinthispracticeareintendedtoprovideastandardizedmethodfordustcollectionfromsurfacesthatcannotbereliablysampledusingwipecollectionmethods(forexample,PracticeD6966).Additionally,theproceduredescribedusesequipmentthatisreadilyavailableandincommonuseforotherenvironmentalandoccupationalhygienesamplingapplications.Theentirecontentsofthefilterholder,thatis,thefilterpluscollecteddust,istargetedforsubsequentanalysisformetalscontent.Aninternalcapsuleisusedifgravimetricanalysisisnecessary.1.1Thispracticecoversthemicro-vacuumcollectionofsurfacedustforsubsequentdeterminationofmetals.Theprimaryintendedapplicationisforsamplingfromsoft,rough,orporoussurfaces.1.2Micro-vacuumsamplingiscarriedoutusingacollectionnozzleattachedtoafilterholder(samplingcassette),whichisinturnconnectedtoanairsamplingpump.1.3Thispracticeallowsforthesubsequentdeterminationofmetalsonaloadingbasis(massofmetal(s)perunitareasampled),oronaconcentrationbasis(massofmetal(s)perunitmassofsamplecollected),orboth.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.5Limitations8212;Duetoanumberofphysicalfactorsinherentinthemicro-vacuumsamplingmethod,analyticalresultsforvacuumdustsamplesarenotlikelytoreflectthetotaldustcontainedwithinthesamplingareapriortosamplecollection.Indeed,dustcollectionwillgenerallybebiasedtowardssmaller,lessdensedustparticles.Nevertheless,theuseofthisstandardpracticewillgeneratedatathatareconsistentandcomparablebetweenoperatorsperformingmicro-vacuumcollectionatavarietyofsamplinglocationsandsites.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G04
【国际标准分类号】:71_040_99
【页数】:4P.;A4
【正文语种】:
基本信息
| 标准名称： | 地面瞄准自检设备技术条件 |
| 中标分类： |
航空、航天 >>
航天地面设备 >>
发射、发控设备 |
| ICS分类： |
航空器和航天器工程 >>
地面服务和维修设备
|
| 发布日期： | 1990-01-20 |
| 实施日期： | 1990-12-01 |
| 首发日期： | |
| 作废日期： | |
| 出版日期： | |
| 页数： | 8页 |
适用范围
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前言
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目录
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引用标准
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所属分类： 航空 航天 航天地面设备 发射 发控设备 航空器和航天器工程 地面服务和维修设备
