SL 42-1992 河流泥沙颗粒分析规程
时间:2024-04-29 12:51:54 来源: 标准资料网 作者:标准资料网 阅读:8315
基本信息
标准名称: | 河流泥沙颗粒分析规程 |
替代情况: | 被SL 42-2010代替 |
发布日期: | |
实施日期: | 1992-09-01 |
首发日期: | |
作废日期: | 2010-04-29 |
出版日期: | |
适用范围
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前言
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目录
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引用标准
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所属分类:
【英文标准名称】:Paperandboard-DeterminationofCIE-whiteness,C/2o(indoorilluminationconditions).
【原文标准名称】:纸和纸板.CIE白度的测定,C/2°(室内照明条件).
【标准号】:NFQ03-105-2010
【标准状态】:现行
【国别】:法国
【发布日期】:2010-10-01
【实施或试行日期】:2010-10-01
【发布单位】:法国标准化协会(FR-AFNOR)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:Board(paper);Definitions;Determination;Indoorlighting;Interiorlighting;Opticaltests;Paper;Testing;Wavelengths;Whiteness
【摘要】:
【中国标准分类号】:
【国际标准分类号】:85_060
【页数】:17P;A4
【正文语种】:其他
【英文标准名称】:StandardTestMethodforEstimatingStrayRadiantPowerRatioofDispersiveSpectrophotometersbytheOpaqueFilterMethod
【原文标准名称】:用不透明滤光器评估色散分光光度计杂散辐射功率的标准试验方法
【标准号】:ASTME387-2004(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:2004
【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】:E13.01
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:molecularspectroscopy;spectrophotometry;SRP;SRPR;straylight;strayradiantpower;strayradiantpowerratio;Energyanalysis;Energydeposition;Radiantenergy;Spectrophotometry--absorption
【摘要】:Strayradiantpowercanbeasignificantsourceoferrorinspectrophotometricmeasurements.SRPusuallyincreaseswiththepassageoftime;therefore,testingshouldbeperformedperiodically.Moreover,theSRPRtestisanexcellentindicatoroftheoverallconditionofaspectrophotometer.Acontrol-chartrecordoftheresultsofroutinelyperformedSRPRtestscanbeausefulindicatorofneedforcorrectiveactionor,atleast,ofthechangingreliabilityofcriticalmeasurements.Thistestmethodprovidesameansofdeterminingthestrayradiantpowerratioofaspectrophotometeratselectedwavelengthsinaspectralrange,asdeterminedbytheSRPfilterused,therebyrevealingthosewavelengthregionswheresignificantphotometricerrorsmightoccur.Itdoesnotprovideameansofcalculatingcorrectionstoindicatedabsorbance(ortransmittance)values.Thetestmethodmustbeusedwithcareandunderstanding,aserroneousresultscanoccur,especiallywithrespecttosomemoderngratinginstrumentsthatincorporatemoderatelynarrowbandpassSRP-blockingfilters.Thistestmethoddoesnotprovideabasisforcomparingtheperformanceofdifferentspectrophotometers.Note88212;Kaye(3)discussescorrectionmethodsofmeasuredtransmittances(absorbances)thatsometimescanbeusedifsufficientinformationonthepropertiesandperformanceoftheinstrumentcanbeacquired.SeealsoA1.2.5.Thistestmethoddescribestheperformanceofaspectrophotometerintermsofthespecifictestparametersused.Whenananalyticalsampleismeasured,absorptionbythesampleofradiationoutsideofthenominalbandpassattheanalyticalwavelengthcancauseaphotometricerror,underestimatingthetransmittanceoroverestimatingtheabsorbance,andcorrespondinglyunderestimatingtheSRPR.TheSRPRindicatedbythistestmethodusingSRPfiltersisalmostalwaysanunderestimationofthetruevalue(see1.3).Avaluecitedinamanufacturerx2019;sliteraturerepresentstheperformanceofanewinstrument,testedexactlyinaccordancewiththemanufacturerx2019;sspecification.Theimplicationisthatthemanufacturerx2019;sstatedSRPRcanserveasabenchmarkforfutureperformance,providedthattheuserperformsthemanufacturerx2019;sspecifiedtest.Itisrecommendedthatuserstestnewinstrumentspromptly,therebyestablishingacomparativebenchmarkintermsoftheirowntestingfacilities.Thesolutionfilterratiomethod(4.3)isaconvenientmethodforcontrol-chartingSRPR.Mielenz,etal.,(4)showthatitsresultstendtocorrelatewellwiththoseofthespecifiedwavelengthmethod,butforcriticalcomparisonwiththemanufacturerx2019;sspecification,themethodusedbythemanufacturermustbeused.BecausesomeinstrumentsreduceSRPbyincorporatingmoderatelynarrowbandpassSRP-blockingfiltersthatarechangedasthewavelengthrangeisscanned,itispossibleforSRPRdeterminationstobehighlyinaccurateifthecutoffwavelengthoftheSRPfilterfallstooclosetotheabsorptionedgeofaninstrumentx2019;sSRP-reducingfilter(3).1.1Strayradiantpower(SRP)canbeasignificantsourceoferrorinspectrophotometricmeasurements,andthedangerthatsucherrorexistsisenhancedbecauseitspresenceoftenisnotsuspected(1-4).Thistestmethodaffordsanestimateoftherelativeradiantpower,thatis,theStrayRadiantPowerRatio(SRPR),atwavelengthsremotefromthoseofthenominalbandpasstransmittedthroughthemonochromatorofanabsorptionspectrophotometer.Test-fil......
【中国标准分类号】:N33
【国际标准分类号】:
【页数】:11P.;A4
【正文语种】:英语