ASTM D 522a-1993 涂覆有机涂层的芯杆弯曲试验的标准试验方法

上一篇: ASTM F 402-1993 热塑性塑料管及配件接合用溶剂粘结剂、油漆腻子及清洁剂的安全操作规范
下一篇: ISO 7507-3-1993 石油和液态石油产品直立式圆筒状油罐的标定第3部分:光学三角测量法

【英文标准名称】:StandardPracticeforEvaluatingthePerformanceofDiffusiveSamplers
【原文标准名称】:评价扩散采样器性能的标准实施规程
【标准号】:ASTMD6246-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008-01-01
【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】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:accuracy;airmonitoring;bias;concentration;diffusive;evaluation;gases;passive;performance;precision;samplingandanalysis;samplers;tests;uncertainty;vapors;workplaceatmospheres;Airmonitoring;Concentration(ofelements);
【摘要】:Gasorvaporsamplingisoftenaccomplishedbyactivelypumpingairthroughacollectionmediumsuchasactivatedcharcoal.Problemsassociatedwithapumpx2013;inconvenience,inaccuracy,andexpensex2013;areinextricablefromthistypeofsampling.Thealternativecoveredbythispracticeistousediffusionformovingthecompoundofinterestontothecollectionmedium.Thisapproachtosamplingisattractivebecauseoftheconvenienceofuseandlowtotalmonitoringcost.However,previousstudieshavefoundsignificantproblemswiththeaccuracyofsomesamplers.Therefore,althoughdiffusivesamplersmayprovideaplethoraofdata,inaccuraciesandmisuseofdiffusivesamplersmayyetaffectresearchstudies.Furthermore,workerprotectionsmaybebasedonfaultyassumptions.Theaimofthispracticeistocountertheuncertaintiesindiffusivesamplingthroughachievingabroadlyacceptedsetofperformancetestsandacceptancecriteriaforprovingtheefficacyofanygivendiffusivesamplerintendedforuse.1.1Thispracticecoverstheevaluationoftheperformanceofdiffusivesamplersofgasesandvaporsforuseoversamplingperiodsfrom4to12handforwindspeedslessthan0.5m/s.Suchsamplingperiodsandwindspeedsarethemostcommonintheindoorworkplacesetting.Thispracticedoesnotapplytostaticorareasamplinginwindspeedslessthan0.1m/s,whendiffusionoutsidethesamplermaydominateneededconvectionfromtheambientairtothevicinityofthesampler.Givenasuitableexposurechamber,thepracticecanbeextendedtocoversampleruseforothersamplingperiodsandconditions.Theaimistoprovideaconcisesetofexperimentsforclassifyingsamplersprimarilyinaccordancewithasinglesampleraccuracyfigure.Accuracyisdefined(3.2.1)inthisstandardsoastotakeintoaccountbothimprecisionanduncorrectedbias.Accuracyestimatesrefertoconditionsofsamplerusewhicharenormallyexpectedinaworkplacesetting.Theseconditionsmaybecharacterizedbythetemperature,atmosphericpressure,humidity,andambientwindspeed,noneofwhichmaybeconstantoraccuratelyknownwhenthesamplerisusedinthefield.Futhermore,theaccuracyaccountsfortheeffectsofdiffusivelossofanalyteontheestimationoftime-weightedaveragesofconcentrationswhichmaynotbeconstantintime.Asidefromaccuracy,thesamplersaretestedforcompliancewiththemanufacturer''sstatedlimitsoncapacity,possiblyinthepresenceofinterferingcompounds.1.2Thispracticeisanextensionofpreviousresearchondiffusivesamplers(1-14)aswellasPracticesD4597,D4598,D4599,andMDHS27.Anessentialadvancehereistheestimationofsampleraccuracyunderactualconditionsofuse.Futhermore,thecostsofsamplerevaluationarereduced.1.3Knowledgegainedfromsimilaranalytesexpeditessamplerevaluation.Forexample,interpolationofdatacharacterizingthesamplingofanalytesatseparatedpointsofahomologousseriesofcompoundsisrecommended.Atpresenttheprocedureof(9)issuggested.Followingevaluationofasamplerinuseatasinglehomologousseriesmemberaccordingtothepresentpractice,highermolecularweightmemberswouldreceivepartialvalidationsconsideringsamplingrate,capacity,analyticalrecovery,andinterferences.Thetestfordiffusiveanalytelosscanbeomittediftheeffectisfoundnegligibleforagivensampleroranalyteseries.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurportt......
【中国标准分类号】:C70
【国际标准分类号】:13_040_30
【页数】:8P.;A4
【正文语种】:英语

标准名称：	色素炭黑着色力的测定(B法)
中标分类：	化工 >> 橡胶制品及其辅助材料 >> 炭黑
替代情况：	被GB/T 7050-1993代替
发布日期：	1900-01-01
实施日期：	1987-10-01
首发日期：	1900-01-01
作废日期：	1900-01-01
出版日期：	1900-01-01
页数：	2页

没有内容

没有内容

没有内容

没有内容