【英文标准名称】:StandardTestMethodforDeterminingConcentrationofAirborneSingle-CrystalCeramicWhiskersintheWorkplaceEnvironmentbyPhaseContrastMicroscopy
【原文标准名称】:用相位显微术对工作环境空气中单晶陶瓷晶须浓度的测定的标准试验方法
【标准号】:ASTMD6057-1996(2006)
【标准状态】:现行
【国别】:
【发布日期】:1996
【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】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:airmonitoring;phasecontrastmicroscopy;samplingandanalysis;siliconcarbidewhiskers;singlecrystalceramicwhiskers;workplaceenvironment
【摘要】:TheSCCWmaybepresentintheworkplaceatmospherewherethesematerialsaremanufactured,processed,transported,orused.Thistestmethodcanbeusedtomonitorairborneconcentrationsoffibersintheseenvironments.Itmaybeemployedaspartofapersonalorareamonitoringstrategy.Thistestmethodisbasedondimensionalconsiderationsonly.Assuch,itdoesnotprovideapositiveidentificationofthefiberscounted.AnalysisbySEMorTEMisrequiredwhenadditionalfiberidentificationinformationisneeded.Note18212;ThistestmethodassumesthattheanalystisfamiliarwiththeoperationofPCMinstrumentationandtheinterpretationofdataobtainedusingthistechnique.Thistestmethodisnotappropriateformeasurementoffiberswithdiameterslessthanapproximately0.25x03BC;mduetovisibilitylimitationsassociatedwithPCM.TheSEMorTEMmethodsmaybeusedtoprovideadditionalsizeinformationofSCCWifneeded(refertoPracticeD6058foradditionalinformationontheuseofthesemethods).Resultsfromtheuseofthistestmethodshallbereportedalongwith95%confidencelimitsforthesamplesbeingstudied.Individuallaboratoriesshalldeterminetheirintralaboratorycoefficientofvariationanduseitforreporting95%confidencelimits(1,3,4).1.1Thistestmethodcoversthesamplingmethodsandanalysistechniquesusedtoassesstheairborneconcentrationofsingle-crystalceramicwhiskers(SCCW),suchassiliconcarbideandsiliconnitride,whichmayoccurinandaroundtheworkplacewherethesematerialsaremanufactured,processed,transported,orused.Thistestmethodisbasedonthecollectionoffibersbyfiltrationofaknownquantityofairthroughafilter.Thefilterissubsequentlyevaluatedwithaphasecontrastmicroscope(PCM)forthenumberoffibersmeetingappropriatelyselectedcountingcriteria.Thistestmethodcannotdistinguishamongdifferenttypesoffibers.Thistestmethodmaybeappropriateforotherman-mademineralfibers(MMMF).1.2Thistestmethodisapplicabletothequantitationoffibersonacollectionfilterthataregreaterthan5minlength,lessthan3minwidth,andhaveanaspectratioequaltoorgreaterthan5:1.Thedataaredirectlyconvertibletoastatementofconcentrationperunitvolumeofairsampled.ThistestmethodislimitedbythediameterofthefibersvisiblebyPCM(typicallygreaterthan0.25minwidth)andtheamountandtypeofcoincidentinterferenceparticles.1.3AmoredefinitiveanalysismaybenecessarytoconfirmtheidentityanddimensionsofthefiberslocatedwiththePCM,especiallywhereotherfibertypesmaybepresent.Suchtechniquesmayincludescanningelectronmicroscopy(SEM)ortransmissionelectronmicroscopy(TEM).TheuseofthesetestmethodsfortheidentificationandsizedeterminationofSCCWisdescribedinPracticeD6058andTestMethodsD6059andD6056.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Z15
【国际标准分类号】:13_040_30
【页数】:7P.;A4
【正文语种】: