ASTM D7493-2008 用气相色谱法和电化学检测法在线检测天然气和气体燃料中硫化物的标准试验方法

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【英文标准名称】:StandardTestMethodforOnlineMeasurementofSulfurCompoundsinNaturalGasandGaseousFuelsbyGasChromatographandElectrochemicalDetection
【原文标准名称】:用气相色谱法和电化学检测法在线检测天然气和气体燃料中硫化物的标准试验方法
【标准号】:ASTMD7493-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:D03.12
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:electrochemicaldetection;gaschromatography;odorants;on-linemeasurement;sulfurcompounds
【摘要】:Gaseousfuels,suchasnaturalgas,petroleumgasesandbio-gases,containvaryingamountsandtypesofsulfurcompounds.Thesesulfurcompoundsaregenerallyodorous,corrosivetoequipment,andcaninhibitordestroycatalystsemployedingasprocessingandenduse,suchasthoseusedinfuelcell.Theiraccurateon-linemeasurementisessentialtogasprocessing,operationandutilization,andofregulatoryinterest.Smallamounts(typically,total4-6PPMv)ofsulfurodorantsareaddedtonaturalgasandotherfuelgasesforsafetypurposes.Somesulfurodorantscanbereactive,andmaybeoxidized,formingmorestablesulfurcompoundshavinglowerodorthresholds.Thesegaseousfuelsareanalyzedforsulfurodorantstohelpinmonitoringandtoensureappropriateodorantlevelsforpublicsafety.Thismethodoffersanon-linetechniquetocontinuouslyidentifyandquantifyindividualtargetsulfurspeciesingaseousfuelwithautomaticcalibrationandvalidation.1.1Thistestmethodisforon-linemeasurementofvolatilesulfur-containingcompoundsingaseousfuelsbygaschromatography(GC)andelectrochemical(EC)detection.Thetestmethodisapplicabletohydrogensulfide,C1-C4mercaptans,sulfidesandtetrahydrothiophene(THT).1.1.1Carbonylsulfide(COS)isnotcoveredinthistestmethod.1.1.2Thedetectionrangeforsulfurcompoundsisapproximatelyfrom0.1to100PPMvor0.1to100mg/m3.Thedetectionrangemayvarydependingonthesampleinjectionvolume,chromatographicpeakseparationandthesensitivityofspecificECdetector.1.2ThistestmethoddescribesaGC-ECmethodemployingpackedGCcolumnsandaspecificdetectorasanillustrationfornaturalgasandothergaseousfuelcontainingmainlylighthydrocarbons.AlternativeGCcolumns,detectordesignsandinstrumentparametersmaybeusedforthesameanalysisorfordifferenttypesofgaseousfuel,providedthatappropriatechromatographicseparationandoptimaldetectionofthesecompoundscanbeachieved.1.3Thistestmethoddoesnotintendtoidentifyandmeasureallindividualsulfurspecies,andismainlyemployedformonitoringnaturalsulfurandsulfurodorantcompoundscommonlyfoundinfuelgasesoremployedasanodorouswarningagentinfuelgases.1.4Thetestmethodisnormallyemployedforrepetitiveon-linemonitoringofsulfurcomponentsinfuelgaseswithasinglesulfurstandard.Thetestmethodmaybeemployedforlaboratory-qualitymeasurementwithmoreextensivecalibration.(SeeTestMethodsD5504,D5623,D6228,D6968,ISO19739,ISO6326-2,andGPA2199.)1.5Thetestmethodcanbeusedformeasurementofalllistedsulfurcompoundsinairorothergases,providedthatnocompound,whichcaninterferewiththeGCseparationandelectrochemicaldetection,ispresent.1.6ThistestmethodiswritteninconjunctionwithPracticesD5287,D7165andD7166.1.7ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.8Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:E24
【国际标准分类号】:75_160_30
【页数】:7P.;A4
【正文语种】:英语