EPA Method 20

METHOD20-DETERMINATIONOFNITROGENOXIDES,SULFURDIOXIDE,ANDDILUENTEMISSIONSFROMSTATIONARYGASTURBINES1.0ScopeandApplicationWhatisMethod20?Method20containsthedetailsyoumustfollowwhenusinganinstrumentalanalyzertodetermineconcentrationsofnitrogenoxides,oxygen,carbondioxide,andsulfurdioxideintheemissionsfromstationarygasturbines.Thismethodfollowsthespecificinstructionsforequipmentandperformancerequirements,supplies,samplecollectionandanalysis,calculations,anddataanalysisinthemethodslistedinSection2.0.1.1Analytes.Whatdoesthismethoddetermine?AnalyteCASNo.SensitivityNitrogenoxides(NOx)asnitrogendioxideNitricoxide(NO)Nitrogendioxide(NO2)10102-43-910102-44-0Typically2%ofCalibrationSpanDiluentoxygen(O2)orcarbondioxide(CO2)Typically2%ofCalibrationSpanSulfurdioxide(SO2)7446-09-5Typically2%ofCalibrationSpan1.2Applicability.Whenisthismethodrequired?TheuseofMethod20mayberequiredbyspecificNewSourcePerformanceStandards,CleanAirMarketingrules,andStateImplementationPlansandpermitswheremeasuringSO2,NOx,CO2,and/orO2concentrationsinstationarygasturbinesemissionsarerequired.Otherregulationsmayalsorequireitsuse.1.3DataQualityObjectives.Howgoodmustmycollecteddatabe?RefertoSection1.3ofMethod7E.2.0SummaryofMethodInthismethod,NOx,O2(orCO2),andSO2aremeasuredusingthefollowingmethodsfoundinappendixAtothispart:(a)Method1—SampleandVelocityTraversesforStationarySources.(b)Method3A—DeterminationofOxygenandCarbonDioxideEmissionsFromStationarySources(InstrumentalAnalyzerProcedure).(c)Method6C—DeterminationofSulfurDioxideEmissionsFromStationarySources(InstrumentalAnalyzerProcedure).(d)Method7E—DeterminationofNitrogenOxidesEmissionsFromStationarySources(InstrumentalAnalyzerProcedure).3.0DefinitionsRefertoSection3.0ofMethod7Efortheapplicabledefinitions.4.0InterferencesRefertoSection4.0ofMethods3A,6C,and7Easapplicable.5.0SafetyRefertoSection5.0ofMethod7E.6.0EquipmentandSuppliesThemeasurementsystemdesignisshowninFigure7E-1ofMethod7E.RefertotheappropriatemethodslistedinSection2.0forequipmentandsupplies.7.0ReagentsandStandardsRefertotheappropriatemethodslistedinSection2.0forreagentsandstandards.8.0SampleCollection,Preservation,Storage,andTransport8.1SamplingSiteandSamplingPoints.YoumustfollowtheproceduresofSection8.1ofMethod7E.8.2InitialMeasurementSystemPerformanceTests.YoumustrefertotheappropriatemethodslistedinSection2.0forthemeasurementsystemperformancetestsasapplicable.8.3InterferenceCheck.YoumustfollowtheproceduresinSection8.3ofMethod3Aor6C,orSection8.2.7ofMethod7E(asappropriate).8.4SampleCollection.YoumustfollowtheproceduresofSection8.4oftheappropriatemethodslistedinSection2.0.Atestrunmusthaveadurationofatleast21minutes.8.5Post-RunSystemBiasCheck,DriftAssessment,andAlternativeDynamicSpikeProcedure.YoumustfollowtheproceduresofSections8.5and8.6oftheappropriatemethodslistedinSection2.0.9.0QualityControlFollowqualitycontrolproceduresinSection9.0ofMethod7E.10.0CalibrationandStandardizationFollowtheproceduresforcalibrationandstandardizationinSection10.0ofMethod7E.11.0AnalyticalProceduresBecausesamplecollectionandanalysisareperformedtogether(seeSection8),additionaldiscussionoftheanalyticalprocedureisnotnecessary.12.0CalculationsandDataAnalysisYoumustfollowtheproceduresforcalculationsanddataanalysisinSection12.0oftheappropriatemethodlistedinSection2.0.13.0MethodPerformanceThespecificationsfortheapplicableperformancechecksarethesameasinSection13.0ofMethod7E.14.0PollutionPrevention[Reserved]15.0WasteManagement[Reserved]16.0AlternativeProceduresRefertoSection16.0oftheappropriatemethodlistedinSection2.0foralternativeprocedures.17.0ReferencesRefertoSection17.0oftheappropriatemethodlistedinSection2.0forreferences.18.0Tables,Diagrams,Flowcharts,andValidationDataRefertoSection18.0oftheappropriatemethodlistedinSection2.0fortables,diagrams,flowcharts,andvalidationdata.