ASTM D7144-2005a 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

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【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】: