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【英文标准名称】:StandardTestMethodforTraceImpuritiesinMonocyclicAromaticHydrocarbonsbyGasChromatographyandExternalCalibration
【原文标准名称】:用气相色谱法和外标法对单环芳香烃中微量杂质的标准试验方法
【标准号】:ASTMD5917-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【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】:D16.04
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:aromatics;externalstandard;gaschromatography;impurities;purity;p-xylene;toluene;xylenes;Aliphatichydrocarbons;Aromaticcompounds;Externalcalibration;Gaschromatography(GC)--paints/relatedcoatings/materials;Mo
【摘要】:Determiningthetypeandamountofhydrocarbonimpuritiesremainingfromthemanufactureoftoluene,mixedxylenes,andp-xylenesusedaschemicalintermediatesandsolventsisoftenrequired.Thistestmethodissuitableforsettingspecificationsandforuseasaninternalqualitycontroltoolwheretheseproductsareproducedorareused.Typicalimpuritiesare:alkanescontaining1to10carbonsatoms,benzene,toluene,ethylbenzene(EB),xylenes,andaromatichydrocarbonscontainingninecarbonatoms.RefertoTestMethodD2306fordeterminingtheC8aromatichydrocarbondistributioninmixedxylenes.Purityiscommonlyreportedbysubtractingthedeterminedexpectedimpuritiesfrom100.00.However,agaschromatographicanalysiscannotdetermineabsolutepurityifunknownorundetectedcomponentsarecontainedwithinthematerialbeingexamined.ThistestmethodissimilartoTestMethodD2360,however,interlaboratorytestinghasindicatedabiasmayexistbetweenthetwomethods.Thereforetheuseriscautionedthatthetwomethodsmaynotgivecomparableresults.1.1Thistestmethodcoversthedeterminationofthetotalnonaromatichydrocarbonsandtracemonocyclicaromatichydrocarbonsintoluene,mixedxylenes,andp-xylenesbygaschromatography.Thepurityoftoluene,mixedxylenes,orp-xylenescanalsobecalculated.Calibrationofthegaschromatographicsystemisdonebytheexternalstandardcalibrationtechnique.Asimilartestmethod,usingtheinternalstandardcalibrationtechnique,isTestMethodD2360.1.2Totalaliphatichydrocarbonscontaining1through10carbonatoms(methanethroughdecanes)canbedetectedbythistestmethodatconcentrationsrangingfrom0.001to2.500weight%.1.2.1Asmallamountofbenzeneinmixedxylenesorp-xylenesmaynotbedistinguishedfromthenonaromaticsandtheconcentrationsaredeterminedasacomposite(see6.1).1.3Monocyclicaromatichydrocarbonimpuritiescontaining6through10carbonatoms(benzenethroughC10aromatics)canbedetectedbythistestmethodatindividualconcentrationsrangingfrom0.001to1.000weight%.1.4Indeterminingtheconformanceofthetestresultstoapplicablespecifications,resultsshallberoundedoffinaccordancewiththerounding-offmethodofPracticeE29.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Forspecifichazardstatement,seeSection9.
【中国标准分类号】:G17
【国际标准分类号】:71_080_15
【页数】:8P.;A4
【正文语种】:英语


【英文标准名称】:Informationtechnology-130mmopticaldiskcartridgesforinformationinterchange-Capacity:5,2Gbytespercartridge
【原文标准名称】:信息技术信息交换用130mm盒式光盘容量:每盒5.2GB
【标准号】:ISO/IEC15286-1999
【标准状态】:现行
【国别】:国际
【发布日期】:1999-05
【实施或试行日期】:
【发布单位】:国际标准化组织(ISO)
【起草单位】:ISO/IECJTC1
【标准类型】:()
【标准水平】:()
【中文主题词】:物理性能;容量;信息交流;尺寸;信息交换;光盘;规范;磁性能;互换性;只读存储器;磁道格式;盒式光盘;机械性能;数据记录
【英文主题词】:
【摘要】:ThisInternationalStandardspecifiesthecharacteristicsofaseriesofrelated130mmopticaldiskcartridges(ODCs)byusinganumberofTypedesignations.Adiskhastwosides,calledSideAandSideB.Eachsidecanhaveanominalcapacityof2,6Gbytes.TypeR/Wprovidesfordatatobewritten,readanderasedmanytimesovertherecordingsurfaceofthecorrespondingdiskside,usingthethermo-magneticandmagneto-opticaleffects.TypeP-ROMprovidesforapartofthedisksurfacetobepre-recordedandreproducedbystampingorothermeans.Thispartofthediskisreadwithoutrecoursetothemagneto-opticaleffect.Allpartswhicharenotpre-recordedprovidefordatatomeettherequirementsofTypeR/W.TypeO-ROMprovidesforthewholeofthedisksurfacetobepre-recordedandreproducedbystampingorothermeans.Thecorrespondingdisksidesarereadwithoutrecoursetothemagneto-opticaleffect.TypeDOWprovidesfordatatobewrittenandreadmanytimesovertherecordingsurfaceofthecorrespondingdiskside,usingthedirectoverwritethermo-magneticandmagneto-opticaleffectsrequiringasingleexternalmagneticfield.TypeP-DOWprovidesforapartofthedisksurfacetobepre-recordedandreproducedbystampingorothermeans.Thispartofthediskisreadwithoutrecoursetothemagneto-opticaleffect.Allpartswhicharenotpre-recordedprovidefordatatomeettherequirementsofTypeDOW.TypeWOprovideswriteonce,readmultiplefunctionalityusingthethermo-magneticandmagneto-opticaleffects.TypeWO-DOWprovideswriteonce,readmultiplefunctionalityusingthedirectoverwritethermo-magneticandmagneto-opticaleffects.Inaddition,foreachType,thisInternationalStandardprovidesforcartridgescontainingadiskwithasectorsizeof512bytes,cartridgescontainingadiskwithasectorsizeof1024bytesandcartridgescontainingadiskwithasectorsizeof2048bytes.Allsectorsofadiskarethesamesize.ThisInternationalStandardspecifies-theconditionsforconformancetestingandtheReferenceDrive;-theenvironmentsinwhichthecartridgesaretobeoperatedandstored;-themechanical,physicalanddimensionalcharacteristicsofthecartridge,soastoprovidemechanicalinterchangeabilitybetweendataprocessingsystems;-theformatoftheinformationonthedisk,bothembossedanduser-written,includingthephysicaldispositionofthetracksandsectors,theerrorcorrectioncodes,themodulationmethodsused;-thecharacteristicsoftheembossedinformationonthedisk;-themagneto-opticalcharacteristicsofthedisk,enablingprocessingsystemstowritedataontothedisk;-theminimumqualityofuser-writtendataonthedisk,enablingdataprocessingsystemstoreaddatafromthedisk.ThisInternationalStandardprovidesforinterchangebetweenopticaldiskdrives.TogetherwithaStandardforvolumeandfilestructureitprovidesforfulldatainterchangebetweendataprocessingsystems.
【中国标准分类号】:L64
【国际标准分类号】:35_220_30
【页数】:148P;A4
【正文语种】:英语