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1、timeswhentheNO2wasturnedOnandOff.WhentheNO2mixturewasturnedOn,therewasaninitial10-seconddelay,partiallyduetothetimeittakesforthegastotravelthroughtheapproximately6feetoftubingassociatedwiththegasdeliverysystem.Includingtheseinitialperiodsofdelay,90%ofthefinalrespo
2、nsetotheNO2mixture,aswellastothesubsequentairpurging,wasobtainedin1.5and2minutes,respectively.ThemagnitudesoftheresponseoftwoseparatesensorstoNO2inairmixturesintherangeof1.2to392ppm,aredemonstratedinTableIV.Thenumbersrepresentthedif-'iIferencesinpotentialbetweenai
3、randthespecifiedmixture.Whilethedatawithelectrode46-9wereobtainedwithaI/fluidelectrolyte[0.1M(NH&HPOd],theelectrolyteinthecellcontainingsensor46-Awasimmobilizedbygellingthe.-abovementionedsolutionwith0.5Agar/100cm3electro-I-IIIIIIIIIII1IIIIllIIllin'Wlyte.,@Colre"t
4、'al*r1WrrThemagnitudesoftheresponseareessentiallythesameforthetwosensors.InthecaseofthesystememployingtheFigure3.Calibrationcurvesobtainedwith:(A)electrodeNo.46-9gelledelectrolyte,theadvantageofportabilityhasbeenand(E)electrodeNo.46-A,curvedisplacedby$60mVgainedsi
5、ncethepossibilityoffloodingthesensingsurface,duetoanymovementofthecellduringthecourseoftheaclassicaltypeofredoxreaction.Consideringthestandardmeasurement,hasbeeneliminated.deviations,thissystem,initscurrentstateofdevelopment,TheaveragesandstandarddeviationsfromTab
6、leIVareyieldsasemiquantitativemeansforthedirect,real-timeplottedinFigure3.Thecurvesexhibitslopesof70mV/analysisofNO*.decade.Precedentsdoexist(2,5)forsucha"super-Nern-RECEIVEDforreviewJanuary21,1974.AcceptedMay3,stian"responseofanelectrochemicalprocessnotinvolving1
7、974.ElectrochemicalTechniquefortheMeasurementofCarbonMonoxideH.W.Bay,K.F.Blurton,J.M.Sedlak,andA.M.ValentineEnergeticsScience,lnc.,85ExecutiveBoulevard,Elmsford,N.Y.10523RecentlyaportableinstrumentforthemeasurementofAnalyzedmixturesofCOinairintherange21-385ppmCoca
8、rbonmonoxidewasdescribed(I,2)andindependentlywereobtainedfromMathesonGasProductsGo.Themixturesevaluated(3,4).Itsoperatingprincipleisbasedonelectro-werec
