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HB 1831-2000 包胶小轮

作者:标准资料网 时间:2024-05-16 19:52:52  浏览:9401   来源:标准资料网
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基本信息
标准名称:包胶小轮
中标分类: 航空、航天 >> 航空运输与地面设备 >> 机场地面服务系统及设备
替代情况:HB 1831-1987
发布日期:2000-09-21
实施日期:2001-01-01
首发日期:1900-01-01
作废日期:1900-01-01
出版日期:1900-01-01
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所属分类: 航空 航天 航空运输与地面设备 机场地面服务系统及设备
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Product Code:SAE ARP4101
Title:Flight Deck Layout and Facilities
Issuing Committee:S-7 Flight Deck Handling Qualities Stds For Trans Aircraft
Scope: This document recommends criteria for the layout and for the design, installation, and operation of flight deck facilities for transport aircraft.
Rationale: This document recommends criteria for the layout and for the design, installation, and operation of flight deck facilities for transport aircraft.【英文标准名称】:StandardPracticesforExtractionofTraceElementsfromSediments
【原文标准名称】:萃取沉积物中痕量元素的标准实施规程
【标准号】:ASTMD3974-2009
【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】:D19.07
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:extraction;sediments;toxic;traceelements,Acceleratedaging/testing;Airdryingmethod;Aluminum;Bariumcontent--water;Boron;Cadmiumcontent--water;Calciumcontent--water;Chromiumcontent--water;Cobaltcontent--water;Colorimetricanalysis--wat
【摘要】:Industrializedandurbanareashavebeenfoundtodepositanumberoftoxicelementsintoenvironmentswherethoseelementswerepreviouslyeithernotpresentorwerefoundintraceamounts.Consequently,itisimportanttobeabletomeasuretheconcentrationofthesepollution-depositedelementstoproperlystudypollutioneffects.Thisprocedureisconcernedwiththepollution-relatedtraceelementsthataredescribedin4.1ratherthanthoseelementsincorporatedinthesilicatelatticesofthemineralsfromwhichthesedimentswerederived.Thesepollution-relatedtraceelementsarereleasedintothewaterandreadsorbedbythesedimentswithchangesingeneralwaterquality,pHinparticular.Theseelementsareaserioussourceofpollution.Theelementslockedinthesilicatelatticesarenotreadilyavailableinthebiosphere(1-8).Whencomparingthetraceelementconcentrations,itisimportanttoconsidertheparticlesizestobeanalyzed(8,9).Thefinertheparticlethegreaterthesurfacearea.Consequently,apotentiallygreateramountofagiventraceelementcanbeadsorbedonthesurfaceoffine,particulatesamples(4).Forparticlesizessmallerthan80mesh,metalcontentisnolongerdependentonsurfacearea.Therefore,ifthisportionofthesedimentisused,theanalysiswithrespecttosampletype(thatis,sand,salt,orclay)isnormalized.Ithasalsobeenobservedthatthegreatestcontrastbetweenanomalousandbackgroundsamplesisobtainedwhenlessthan80-meshportionofthesedimentisused(4,5).Afterthesampleshavebeendried,caremustbetakennottogrindthesampleinsuchawaytoalterthenaturalparticle-sizedistribution(14.1).Fracturingaparticledisruptsthesilicatelatticeandmakesavailablethoseelementswhichotherwisearenoteasilydigested(6).Normally,aggregatesofdried,naturalsoils,sediments,andmanyclaysdissociateoncethereagentsareadded(14.3and15.2).1.1Thesepracticesdescribethepartialextractionofsoils,bottomsediments,suspendedsediments,andwaterbornematerialstodeterminetheextractableconcentrationsofcertaintraceelements.1.1.1PracticeAiscapableofextractingconcentrationsofaluminum,boron,barium,cadmium,calcium,chromium,cobalt,copper,iron,lead,magnesium,manganese,molybdenum,nickel,potassium,sodium,strontium,vanadium,andzincfromtheprecedingmaterials.Othermetalsmaybedeterminedusingthispractice.Thisextractionisthemorevigorousandmorecomplicatedofthetwo.1.1.2PracticeBiscapableofextractingconcentrationsofaluminum,cadmium,chromium,cobalt,copper,iron,lead,manganese,nickel,andzincfromtheprecedingmaterials.Othermetalsmaybedeterminedusingthispractice.ThisextractionislessvigorousandlesscomplicatedthanPracticeA.1.2Thesepracticesdescribethreemeansofpreparingsamplespriortodigestion:1.2.1Freeze-drying.1.2.2Air-dryingatroomtemperature.1.2.3Acceleratedair-drying,forexample,95x00B0;C.1.3Thedetectionlimitandlinearconcentrationrangeofeachprocedureforeachelementisdependentontheatomicabsorptionspectrophotometricorothertechniqueemployedandmaybefoundinthemanualaccompanyingtheinstrumentused.AlsoseevariousASTMtestmethodsfordeterminingspecificmetalsusingatomicabsorptionspectrophotometrictechniques.1.3.1Thesensitivityofthepracticecanbeadjustedbyvaryingthesa......
【中国标准分类号】:Z16
【国际标准分类号】:13_060_30
【页数】:4P.;A4
【正文语种】:英语



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