ASTM D6968-2003 用气相色谱法和原子发射检测法同步测量天然气和气体燃料中硫化合物和微量碳氢化合物的标准试验方法

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【英文标准名称】:StandardTestMethodforSimultaneousMeasurementofSulfurCompoundsandMinorHydrocarbonsinNaturalGasandGaseousFuelsbyGasChromatographyandAtomicEmissionDetection
【原文标准名称】:用气相色谱法和原子发射检测法同步测量天然气和气体燃料中硫化合物和微量碳氢化合物的标准试验方法
【标准号】:ASTMD6968-2003
【标准状态】:现行
【国别】:
【发布日期】:2003
【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】:D03.05
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:检测;天然气;同时的;气相色谱法;硫化合物;气体燃料;测量;发射;燃料气;烃类
【英文主题词】:atomicemissiondetection;extendedgasanalysis;gaschomatography;hydrocarbons;odorants;sulfurcompounds;totalsulfur
【摘要】:Gaseousfuels,suchasnaturalgas,petroleumgasesandbio-gases,containvaryingamountsandtypesofsulfurcompounds.Theyaregenerallyodorous,corrosivetoequipment,andcaninhibitordestroycatalystsemployedingasprocessing.Theiraccuratemeasurementisessentialtogasprocessing,operationandutilization,andmaybeofregulatoryinterest.Smallamounts(typically,1to4ppmv)ofsulfurodorantsareaddedtonaturalgasandotherfuelgasesforsafetypurposes.Somesulfurodorantscanbereactive,andmaybeoxidized,formingmorestablesulfurcompoundshavinglowerodorthresholds.Thesegaseousfuelsareanalyzedforsulfurodorantstohelpinmonitoringandtoensureappropriateodorantlevelsforpublicsafety.Thismethodoffersatechniquetodetermineindividualsulfurspeciesingaseousfuelandthetotalsulfurcontentbycalculation.Gaschromatographyiscommonlyandextensivelyusedtodetermineallcomponentsingaseousfuelsincludingfixedgasandorganiccomponents(TestMethodsD1945andD1946).Majorcomponentsmeasuredareoftenusedforthedeterminationofgasproperty,suchasheatingvalueandrelativedensity.Highermolarmasshydrocarbonsareofinterestevenwhenpresentinsmallamountsbecausetheirlargerimpactonheatingvalue,hydrocarbondewpointandgasqualityrelatingtogasoperation,gasutilizationandenvironmentalimpacts.1.1Thistestmethodisforthedeterminationofvolatilesulfur-containingcompoundsandminorhydrocarbonsingaseousfuelsincludingcomponentswithhighermolarmassthanthatofpropaneinahighmethanegas,bygaschromatography(GC)andatomicemissiondetection(AED).HydrocarbonsincludeindividualaliphaticcomponentsfromC4toC6,aromaticcomponentsandgroupsofhydrocarbonsclassifiedaccordingtocarbonnumbersuptoC12atleast,suchasC6-C7,C7-C8,C8-C9andC9-C10,etc.Thedetectionrangeforsulfurandcarboncontainingcompoundsisapproximately20to100000picograms(pg).Thisisroughlyequivalentto0.04to200mg/m3sulfurorcarbonbasedupontheanalysisofa0.25mLsample.1.2ThistestmethoddescribesaGC-AEDmethodemployingaspecificcapillaryGCcolumnasanillustrationfornaturalgasandothergaseousfuelcontaininglowpercentagesofethaneandpropane.AlternativeGCcolumnsandinstrumentparametersmaybeusedinthisanalysisoptimizedfordifferenttypesofgaseousfuel,providedthatappropriateseparationofthecompoundsofinterestcanbeachieved.1.3Thistestmethoddoesnotintendtoidentifyallindividualsulfurspecies.Unknownsulfurcompoundsaremeasuredasmono-sulfurcontainingcompounds.Totalsulfurcontentofasamplecanbefoundbysummingupsulfurcontentpresentinallsulfurspecies.1.4ThismethodisnotaDetailedHydrocarbonAnalysis(DHA)methodanddoesnotintendtoidentifyallindividualhydrocarbonspecies.Aliphatichydrocarboncomponentslighterthann-hexane,benzene,toluene,ethylbenzene,m,p-xylenesando-xylene(BTEX)aregenerallyseparatedandidentifiedindividually.Highermolarmasshydrocarbonsaredeterminedasgroupsbasedoncarbonnumber,excludingBTEX.Thetotalcarboncontentofpropaneandhighermolarmasscomponentsinasamplecanbefoundbysummingupcarboncontentpresentinallspeciescontainingcarbon.1.5ThevaluesstatedinSIunitsarestandard.Thevaluesstatedininch-poundunitsareforinformationonly.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesa......
【中国标准分类号】:E24
【国际标准分类号】:71_040_50;75_160_30
【页数】:7P.;A4
【正文语种】: