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【英文标准名称】:StandardTestMethodsforEvaluationofTotalSulfationActivityintheAtmospherebytheLeadDioxideTechnique
【原文标准名称】:用二氧化铅技术评价空气中总硫酸盐活性的标准试验方法
【标准号】:ASTMD2010/D2010M-1998(2004)
【标准状态】:现行
【国别】:美国
【发布日期】:1998
【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】:D22.03
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:atmospheres;Hueyplates;leaddioxide;leaddioxidecandles;sampling;sulfation;sulfationplates;sulfurdioxide
【摘要】:Sulfuroxidegasesareproducedduringthecombustionofmaterialscontainingsulfur.Thesegasesareprecursorsofatmosphericsulfuricacid,whichhasbeenshowntobeinjurioustolivingcreaturesandplants,aswellassomeinanimatematerialssuchasmetals,limestoneandsandstonebuildingmaterials.Sulfurdioxideismoderatelytoxicandstronglyphytotoxictomanyspecies.PermissibleambientlevelsofSO2havebeenestablishedbylaw.Whenitisnecessarytoestablishwhetherambientairconcentrationsofsulfuricacidprecursors,suchassulfuroxides,arepresentandtocomplywithlegalcriteria,manualandautomaticmonitoringsystemsspecificfortheindividualsulfurspeciesareused.LikelylocationsformonitoringsitesfortheestimationofconcentrationsandconcentrationtrendsoverlongperiodsoftimecanbescreenedconvenientlyusingthePbO2candlesorsulfationplates.Atmosphericcorrosionofmetallicmaterialsisafunctionofmanyweatherandatmosphericvariables.Theeffectofspecificcorrodants,suchasSO2,canacceleratetheatmosphericcorrosionofmetalsorstructuressignificantly.ThePbO2candleandsulfationplatetestmethodsprovidesimpletechniquestomonitorSO2levelsintheatmosphereindependentlytoyieldaweightedaverageresult.TheresultsofthesetestmethodsareusefulforcharacterizingatmosphericcorrosiontestsitesregardingtheeffectiveaverageconcentrationsofSO2intheatmosphereattheselocations.Thesetestmethodsareusefulfordeterminingmicroclimaticseasonalandlong-termvariationsineffectiveaverageSO2concentrations.TheresultsofthesetestmethodsmaybeusedincorrelationsofatmosphericcorrosionrateswithatmospheredatatodeterminethesensitivityofthecorrosionratetotheSO2level.Thesetestmethodsmayalsobeusedwithothertestmethodstocharacterizetheatmosphereatsitesatwhichbuildingsorotherconstructionareplannedinordertodeterminetheextentofprotectivemeasuresrequiredforthematerialsofconstruction.1.1Thesetestmethodsdescribetheevaluationofthetotalsulfationactivityintheatmosphere.Becauseofitsoxidizingpower,leaddioxide(PbO2)convertsnotonlysulfurdioxide(SO2),butothercompounds,suchasmercaptansandhydrogensulfide,intosulfate.Itfixessulfurtrioxideandsulfuricacidmistpresentintheatmosphere(seeNote0).1.2TestMethodAdescribestheuseofaPbO2candle,andTestMethodBdescribesthatofaPbO2sulfationplate.1.3ThesetestmethodsprovideaweightedaverageeffectiveSO2levelfora30-dayinterval.1.4TheresultsofthesetestmethodscorrelateapproximatelywithvolumetricSO2concentrations,althoughthepresenceofdeworcondensedmoisturetendstoenhancethecaptureofSO2ontothecandleorplate.1.5ThevaluesstatedinSIunitsshallberegardedasthestandard.Thevaluesgiveninbracketsareforinformationonlyandmaybeapproximate.Note0IthasbeenshownthattherateconstantofthechemicalreactionbetweenSO2andPbO2isindependentoftheconcentrationofSO2uptolevelsof1000ppm(v),if15%orlessofthePbO2hasbeenreduced().15%ofthePbO2isequivalentto11to12mgofSO2/cm2perday.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.......
【中国标准分类号】:Z15
【国际标准分类号】:13_040_20
【页数】:6P.;A4
【正文语种】:英语