EPA Method 305

2052METHOD305:MEASUREMENTOFEMISSIONPOTENTIALOFINDIVIDUALVOLATILEORGANICCOMPOUNDSINWASTENOTE:Thismethoddoesnotincludeallofthespecifications(e.g.,equipmentandsupplies)andprocedures(e.g.,samplingandanalytical)essentialtoitsperformance.Somematerialisincorporatedbyreferencefromothermethodsin40CFRPart60,AppendixA.Therefore,toobtainreliableresults,personsusingthismethodshouldhaveathoroughknowledgeofatleastMethod25D.1.0ScopeandApplication.1.1Analyte.VolatileOrganics.NoCASNo.assigned.1.2Applicability.Thisprocedureisusedtodeterminetheemissionpotentialofindividualvolatileorganics(VOs)inwaste.1.3DataQualityObjectives.Adherencetotherequirementsofthismethodwillenhancethequalityofthedataobtainedfromairpollutantsamplingmethods.2.0SummaryofMethod.2.1TheheatedpurgeconditionsestablishedbyMethod25D(40CFRPart60,AppendixA)areusedtoremoveVOsfroma10gramsampleofwastesuspendedina50/50solutionofpolyethyleneglycol(PEG)andwater.Thepurged2053VOsarequantifiedbyusingthesamplecollectionandanalyticaltechniques(e.g.gaschromatography)appropriatefortheVOspresentinthewaste.Therecoveryefficiencyofthesamplecollectionandanalyticaltechniqueisdeterminedforeachwastematrix.Acorrectionfactorisdeterminedforeachcompound(ifacceptablerecoverycriteriarequirementsaremetof70to130percentrecoveryforeverytargetcompound),andthemeasuredwasteconcentrationiscorrectedwiththecorrectionfactorforeachcompound.Aminimumofthreereplicatewastesamplesshallbeanalyzed.3.0Definitions.[Reserved]4.0Interferences.[Reserved]5.0Safety.5.1Disclaimer.Thismethodmayinvolvehazardousmaterials,operations,andequipment.Thistestmethodmaynotaddressallofthesafetyproblemsassociatedwithitsuse.Itistheresponsibilityoftheuserofthistestmethodtoestablishappropriatesafetyandhealthpracticesandtodeterminetheapplicabilityofregulatorylimitationspriortoperformingthistestmethod.6.0EquipmentandSupplies.6.1Method25DPurgeApparatus.20546.1.1PurgeChamber.Thepurgechambershallaccommodatethe10gramsampleofwastesuspendedinamatrixof50mLofPEGand50mLofdeionized,hydrocarbon-freewater.Threefittingsareusedontheglasschambertop.Two#7Ace-threadsareusedforthepurgegasinletandoutletconnections.A#50Ace-threadisusedtoconnectthetopofthechambertothebase(seeFigure305-1).Thebaseofthechamberhasaside-armequippedwitha#22Sovirelfittingtoallowforeasysampleintroductionsintothechamber.ThedimensionsofthechamberareshowninFigure305-1.6.1.2FlowDistributionDevice(FDD).TheFDDenhancesthegas-to-liquidcontactforimprovedpurgingefficiency.TheFDDisa6mmOD(0.2in)by30cm(12in)longglasstubeequippedwithfourarmbubblersasshowninFigure305-1.Eacharmshallhaveanopeningof1mm(0.04in)indiameter.6.1.3CoalescingFilter.Thecoalescingfilterservestodiscourageaerosolformationofsamplegasonceitleavesthepurgechamber.Theglassfilterhasafritteddiscmounted10cm(3.9in)fromthebottom.Two#7Ace-threadsareusedfortheinletandoutletconnections.ThedimensionsofthechamberareshowninFigure305-2.20556.1.4Oven.Aforcedconvectionairflowovencapableofmaintainingthepurgechamberandcoalescingfilterat75±2EC(167±3.6EF).6.1.5ToggleValve.Anon/offvalveconstructedfrombrassorstainlesssteelratedto100psig.Thisvalveisplacedinlinebetweenthepurgenitrogensourceandtheflowcontroller.6.1.6FlowController.High-qualitystainlesssteelflowcontrollercapableofrestrictingaflowofnitrogento6±0.06L/min(0.2±0.002ft3/min)at40psig.6.1.7PolyethyleneGlycolCleaningSystem.6.1.7.1Round-BottomFlask.Oneliter,three-neckglassround-bottomflaskforcleaningPEG.Standardtaper24/40jointsaremountedoneachneck.6.1.7.2HeatingMantle.Capableofheatingcontentsofthe1-Lflaskto120EC(248EF).6.1.7.3NitrogenBubbler.Teflon®orglasstube,0.25inOD(6.35mm).6.1.7.4TemperatureSensor.Partialimmersionglassthermometer.6.1.7.5HoseAdapter.Glasswith24/40standardtaperedjoint.6.2VolatileOrganicRecoverySystem.20566.2.1SplitterValve(Optional).Stainlesssteelcross-patternvalvecapableofsplittingnominalflowratesfromthepurgeflowof6L/min(0.2ft3/min).Thevalveshallbemaintainedat75+2EC(167±3.6EF)intheheatedzoneandshallbeplaceddownstreamofthecoalescingfilter.Itisrecommendedthat0.125inOD(3.175mm)tubingbeusedtodirectthesplitventflowfromtheheatedzone.Thebackpressurecausedbythe0.125inOD(3.175mm)tubingiscriticalformaintainingpropersplitvalveoperation.NOTE:Thesplittervalvedesignisoptional;itmaybeusedincaseswheretheconcentrationofapollutantwouldsaturatetheadsorbents.6.2.2InjectionPort.Stainlesssteel1/4inOD(6.35mm)compressionfittingteewitha6mm(0.2in)septumfixedonthetopport.Theinjectionportisthepointofentryfortherecoverystudysolution.Ifusingagaseousstandardtodeterminerecoveryefficiency,connectthegaseousstandardtotheinjectionportofthetee.6.2.3KnockoutTrap(OptionalbutRecommended).A25mLcapacityglassreservoirbodywithafull-stemimpinger(toavoidleaks,amodifiedmidgetglassimpingerwithascrewcapandball/socketclampsontheinletandoutletisrecommended).Theemptyimpingerisplacedinanicewater2057bathbetweentheinjectionportandthesorbentcartridge.Itspurposeistoreducethewatercontentofthepurgegas(saturatedat75EC(167EF))beforethesorbentcartridge.6.2.4InsulatedIceBath.A350mLdewarorothertypeofinsulatedbathisusedtomaintainicewatera