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【英文标准名称】:StandardPracticeforPreparingCoalSamplesforAnalysis
【原文标准名称】:分析用煤样品制备的标准实施规程
【标准号】:ASTMD2013-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:D05.23
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:分析;煤;燃料;准备;工艺;抽样方法;固体燃料;试件
【英文主题词】:coal;composite;division;reduction
【摘要】:Otherstandardsareusedtocollectthegrosssample:PracticeD2234/D2234Mallowsforonedivisionofthegrosssamplebeforecrushing.Themassandtopsizeofthegrossordividedsamplecollectedbyusingtheseguidesandpracticesareusuallytoolargeforchemicalorphysicaltesting.PracticeD2013provideinstructionsforreducinganddividingthegrossordividedsample,byon-lineoroff-lineprocesses,orboth,toatopsizeandmasssuitabletotheperformanceoftesting.Anybiasinthegrossordividedsamplebeforeadherencetothispracticewillremaininthefinalsampleresultingfromuseofthispractice.Therefore,carefullyselectthestandardtobeusedtocollectthegrosssample.Divisionandreductionofasamplemayoccuratmorethanonelocation.Mostoften,thesampleiscollected,reduced,anddivided(oneormoretimes)byuseofamechanicalsamplingsystem.Theremainingsamplemaybefurtherdividedon-sitetofacilitatetransportingittothelaboratorywherefurtherreductionanddivisionlikelyoccursbeforeanalysis.Inplaces,thispracticerequiresairdryingthesamplebeforesubsequentreduction.Proceduresforairdryingandair-drylossdeterminationareprovidedinTestMethodD3302.Mostoften,samplesarereducedanddividedtoananalysissample.However,sometestsmayrequireasampleofdifferentmassortopsize.Thisproceduremaybeusedtoprovideasampleofanymassandsizeconsistfromthegrossordividedsampleto,andincluding,theanalysissample.Thispracticealsospecifieshowtopreparecompositesamples,ifrequired.1.1Thispracticecoversthereductionanddivisionofgrossordividedsamples,andthepreparationofcompositesamples,uptoandincludingtheindividualportionsforlaboratoryanalysis.1.2Reductionanddivisionproceduresareprescribedforcoalsofthefollowinggroups:1.2.1GroupAincludescoalsthathavebeencleanedinallsizes.1.2.2GroupBincludesallothercoals.UnknowncoalsaretobeconsideredunderGroupB.1.2.3GroupAallowssmallerweightlaboratorysamplestoberetainedthanGroupB.Theselowerweightsmaybeusedforparticularcoalsiftheyhavebeenshown,byusingtheproceduresofAnnexA1.2,togiveasamplepreparationandanalysisvariancewhichisnomorethan20%ofthetotalanalysisvariance.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesareprovidedforinformationpurposesonly.1.4Thismethodcoversproceduresforcheckingprecisionofsamplepreparationandanalysisofthevariousstages.Thedataobtainedfromtestsusingconsistentsamplepreparationandanalysismethodareusedtoestimatetherandomerrorsinthevariousstagesofsampledivisionandanalysis.1.5Coalsusedineachseriesoftestsshouldbeofsimilarashcontent.1.6Legitimateestimatesofthevarianceofdivisionandanalysis,Sda2,canonlybemadeusingdataobtainedfromteststhatwererunusingconsistentdivisionandanalysismethods.Coalsusedinthesevariancetestsshouldbeofsimilarashcontent.Anygrosschangeinthedivisionandanalysismethodsorintheashcharacteristicsofthetestcoalwillnullifythetestresults.
【中国标准分类号】:D20
【国际标准分类号】:73_040
【页数】:11P.;A4
【正文语种】:


【英文标准名称】:ESSENTIALOILS.OILOFPARSLEYFRUIT.
【原文标准名称】:香精油.欧芹子香精油
【标准号】:NFT75-230-1976
【标准状态】:作废
【国别】:法国
【发布日期】:1976-04
【实施或试行日期】:1976-03-25
【发布单位】:法国标准化协会(AFNOR)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:器官感觉特性;香精油;化学性质;材料的物理性质;物理性能;欧芹;规范
【英文主题词】:chemicalproperties;physicalproperties;physicalpropertiesofmaterials;parsley;essentialoils;specifications;organolepticproperties
【摘要】:
【中国标准分类号】:B36;X46
【国际标准分类号】:
【页数】:2P;A4
【正文语种】:其他