【英文标准名称】:Semiconductorconvertors;part5:switchesforuninterruptiblepowersystems(UPSswitches)
【原文标准名称】:半导体变流器.第5部分:不间断电源系统开关(UPS开关)
【标准号】:IEC60146-5-1988
【标准状态】:作废
【国别】:国际
【发布日期】:1988
【实施或试行日期】:
【发布单位】:国际电工委员会(IEC)
【起草单位】:IEC/SC22B
【标准类型】:()
【标准水平】:()
【中文主题词】:半导体器件;开关;可不中断的;中断器(断路器);不间断电源系统开关;半导体;电子工程;电气工程;电力变换器;电力电子学;电力系统;隔离开关;电子设备及元件
【英文主题词】:
【摘要】:
【中国标准分类号】:K46
【国际标准分类号】:29_200
【页数】:45P;A4
【正文语种】:英语


【英文标准名称】:StandardTestMethodforDeterminationof2,4-TolueneDiisocyanate(2,4-TDI)and2,6-TolueneDiisocyanate(2,6-TDI)inAir(with9-(N-Methylaminomethyl)AnthraceneMethod)(MAMA)intheWorkplace
【原文标准名称】:在工作室空气中9-N-甲氨基甲基葸(MAMA)对2.4-甲苯聚氨酯(2,4-TDI)和2.6-甲苯聚氨酯(2,6-TDI)测定的标准试验方法
【标准号】:ASTMD5932-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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;dualfiltersamplingsystem;high-performanceliquidchromatography;samplingandanalysis;toluenediisocyanate;workplaceatmospheres;9-(N-methylaminomethyl)anthracene;Airmonitoring;Dualfiltersamp
【摘要】:p>TDIisusedmostlyinthepreparationofrigidandsemi-rigidfoamsandadhesives.Isocyanateusehasbeengrowingforthelast20yearsandtheindustrialneedisstillgrowing.Diisocyanatesandpolyisocyanatesareirritantstoskin,eyes,andmucousmembranes.Theyarerecognizedtocauserespiratoryallergicsensitization,asthmaticbronchitis,andacuterespiratoryintoxication(6-9).TheAmericanConferenceofGovernmentalIndustrialHygienists(ACGIH)hasadoptedaThresholdLimitValuex2013;TimeWeightedAverage(TLVx2014;TWA)of0.036mg/m3withaShort-TermExposureLimit(STEL)of0.14mg/m3for2,4-TDI(10).TheOccupationalSafetyandHealthAdministrationoftheU.S.DepartmentofLabor(OSHA)hasapermissibleexposurelimitof0.02ppm(V)or0.14mg/m3ofTDIasaceilinglimitand0.005ppm(V)or0.036mg/m3asatime-weightedaverage(11).Monitoringofrespiratoryandotherproblemsrelatedtodiisocyanatesandpolyisocyanatesisaidedthroughtheutilizationofthistestmethod,duetoitssensitivityandlowvolumerequirements(15L).Itsshortsamplingtimesarecompatiblewiththedurationofmanyindustrialprocessesanditslowquantificationlimitalsosuitstheconcentrationsoftenfoundintheworkingarea.Thesegregatingsamplingdevicepertainingtothisproposedtestmethodphysicallyseparatesgasandaerosolallowingisocyanateconcentrationsinbothphysicalstatestobeobtained,thushelpingintheselectionofventilationsystemsandpersonalprotection.Thistestmethodisusedtomeasuregaseousconcentrationsof2,4-and2,6-TDIinairforworkplaceandambientatmospheres.1.1Thistestmethodcoversthedeterminationofgaseous2,4-toluenediisocyanate(2,4-TDI)and2,6-toluenediisocyanate(2,6-TDI)inairsamplescollectedfromworkplaceandambientatmospheres.1.2Differentialairsamplingisperformedwithasegregatingdevice.,Thegaseousfractioniscollectedonaglassfiberfilter(GFF)impregnatedwith9-(N-methylaminomethyl)anthracene(MAMA).1.3Theanalysisofthegaseousfractionisperformedwithahighperformanceliquidchromatograph(HPLC)equippedwithultraviolet(UV)andfluorescencedetectors.1.4TheanalysisoftheaerosolfractionisperformedseparatelyasdescribedinRef(1).1.5Therangeofapplicationofthistestmethod,utilizingUVandafluorescencedetector,isvalidatedfor0.029to1.16x03BC;gofmonomer2,4-and2,6-TDI/2.0mLofdesorptionsolution,whichcorrespondstoconcentrationsof0.002to0.077mg/m3ofTDIbasedona15-Lairsample.Thiscorrespondsto0.28to11ppb(V)andbracketstheestablishedTLVvalueof5ppb(v).1.6Afieldblanksamplingsystemisusedtocheckthepossibilityofcontaminationduringtheentiresamplingandanalysis.1.7ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.8Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:C70
【国际标准分类号】:71_040_40
【页数】:6P.;A4
【正文语种】:英语