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【英文标准名称】:StandardTestMethodforParticleSizeDistributionofCatalyticMaterialbyLaserLightScattering
【原文标准名称】:激光散射测定催化材料粒度分布的标准试验方法
【标准号】:ASTMD4464-2000(2005)
【标准状态】:现行
【国别】:
【发布日期】:2000
【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】:D32.02
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:catalyst;FraunhoferDiffraction;lightscattering;MieScattering
【摘要】:Itisimportanttorecognizethattheresultsobtainedbythistestmethodoranyothermethodforparticlesizedeterminationutilizingdifferentphysicalprinciplesmaydisagree.Theresultsarestronglyinfluencedbyphysicalprinciplesemployedbyeachmethodofparticlesizeanalysis.Theresultsofanyparticlesizingmethodshouldbeusedonlyinarelativesenseandshouldnotberegardedasabsolutewhencomparingresultsobtainedbyothermethods.Lightscatteringtheories(FraunhoferDiffraction3andMieScattering4)thatareusedfordeterminationofparticlesizehasbeenavailableformanyyears.Severalmanufacturersoftestingequipmentnowhaveunitsbasedontheseprinciples.Althougheachtypeoftestingequipmentutilizesthesamebasicprinciplesforlightscatteringasafunctionofparticlesize,differentassumptionspertinenttoapplicationofthetheoryanddifferentmodelsforconvertinglightmeasurementstoparticlesize,mayleadtodifferentresultsforeachinstrument.Furthermore,anyparticleswhichareoutsidethesizemeasurementrangeoftheinstrumentwillbeignored,causinganincreaseinthereportedpercentageswithinthedetectablerange.Aparticlesizedistributionwhichendsabruptlyatthedetectionlimitoftheinstrumentmayindicatethatparticlesoutsidetherangearepresent.Therefore,useofthistestmethodcannotguaranteedirectlycomparableresultsfromdifferenttypesofinstruments.Thistestmethodcanbeusedtodetermineparticlesizedistributionsofcatalystsandsupportsformaterialsspecifications,manufacturingcontrol,andresearchanddevelopmentwork.1.1Thistestmethodcoversthedeterminationoftheparticlesizedistributionofcatalystandcatalystcarrierparticlesandisoneofseveralfoundvaluableforthemeasurementofparticlesize.Therangeofparticlesizesinvestigatedwas30to300956;mequivalentsphericaldiameter.Thetechniqueiscapableofmeasuringparticlesaboveandbelowthisrange.Theangleandintensityoflaserlightscatteredbytheparticlesareselectivelymeasuredtopermitcalculationofavolumedistributionusinglight-scatteringtechniques.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G74
【国际标准分类号】:19_120
【页数】:3P.;A4
【正文语种】: