熱脫附是一種廣泛使用的技術，它能將揮發(fā)性和半揮發(fā)性化合物從各種基質中萃取和分離出來。它可以作為一種空氣監(jiān)測技術（室內、室外、車間、轎廂、呼吸等等），也可以是分析土壤、聚合物、包裝材料、食品、調料、化妝品、煙草、建筑材料、藥物和消費品的有效工具。實際上，幾乎任何含有揮發(fā)性有機物的樣品都能使用該技術進行分析。全自動熱脫附食品分析和香料分析的理想選擇非常廣泛的應用半導體和塑料行業(yè)中固體樣品檢測"移動烤箱"獨特技術容易安裝在氣相色譜儀進樣口上方，方便快速安裝和拆除智能樣品傳送通過CTCPAL直接從樣品管熱萃取樣品到GC進樣口加熱爐溫度高達350℃特制聚四氟乙烯插頭和TDAS樣品管密封圈無加熱傳送線或閥門切換-無殘留適用于大體積進樣(liquidN2orliquidCO2coolingrequired)CycleComposer軟件控制可配備AgilentChemStationorThermoFinniganXcalibur插件安裝TDAS后，仍然具有CTC所有的已有液體進樣、頂空進樣、SPME和SPDE等模塊的功能.性能描述系統(tǒng)按照如下操作運行，首先解吸小瓶,開啟脫附管壓蓋,通過PAL的進樣單元將樣品管從抽樣托盤運送到加熱器進口。盡快將吸附管放入加熱爐,進樣單元將吸附管推下，刺破吸附管兩端。加熱爐底部裝有針頭,注入樣品到PTV.承氣流入閥門開關,并通過解吸管傳送到冷卻的PTV.所有樣品都被聚集到冷卻的襯墊上。經過3-5分鐘,在高溫下脫附,PAL把熱脫附單元從進樣口移開.此時,載氣切入進樣口,使之不再經過吸附樣品管.經過短暫平衡時,PTV進樣口迅速升高到它的最高溫度，如果在加熱時你選擇PTV在不分流模式，它將提供最高靈敏度?，F(xiàn)在吸附管可以再TDAS加熱爐里繼續(xù)設定的步驟，否則吸附管將會運回托盤.選擇適當TDAS參數(shù)(例如,解吸溫度、解吸時間),也可能是控制萃取樣品的數(shù)量以及分子量分布.熱脫附應用實例采用熱脫附系統(tǒng)測定三鹵代甲烷(THM)在游泳館空氣中含量.CHROMTECH(t201e)TDAS2000直接熱萃取應用.CHROMTECH,04/2004(t401e)熱脫附氣相色譜分析高沸點、高分子量化合物04/2004(T402e).TDAS2000:TransportsdesorptionvialsautomaticlyviainjectionunitIdealforfoodflavoranalysesSolidsampleanalysesforsemiconductorplasticsindustriesEasytouseforgassamples,usingpre-filledadsorptiontubesSamplecapacityofupto296samplesNotransferlinesnoswitchingvalves.NocarryoverCrimpedsamplecontainer.NocontaminationofsampleEasymountingontopofGC.QuickinstallationremovalSmartvialtransportbyPALSystemDirectthermalextractionfromsamplevialtoGCinjector.Heateroventemperatureofupto350'CAdaptabletoexistingPTVinjectorsSoftwareintegratedwithHP/AgilentChemStationorThermoFinniganXcaliburDescriptionCHROMTECHisknownforitsreliableautomationproducts.Basedonthatreputation,wehavedesignedaneasilyattachablethermaldesorptionsystem.Atthesametime,theCombiPALstillperformsitsheadspace,SPMEliquidinjections.Itcanbetransformedtoathermaldesorptionsysteminfiveminutesorless.GivenCHROMTECH'sbackgroundinautomation,ourfocusisonlarge-samplecapacity.Upto294samplescanbeanalyzedusingoursystem.ThePALTDASfeaturesaunique,retractabledesorptionheaterthatismountedontopoftheGCinjector.Noheatedtransferlinesand/orswitchingvalvesareinitsflowpath.Thebodyofthethermaldesorptionunitretracts,sothaterrorsrelatedtosamplecontaminationlowreproducibilityareeliminated.Generally,PTVinjectors-cooledbyliquidnitrogenorCO2-areusedinconjunctionwithoursystemforthermaldesorptionanalysis.Thesystemworksasfollows.First,desorptionvials,crimpedwithregularcaps,aretransportedfromthesampletraytotheheaterinletportbythePAL'sinjectionunit.Assoonasthevialisplacedintotheheater,theinjectionunitpushesthevialheaterdownwards,piercingbothvialends.Thebottomoftheheater,whichisfittedwithasyringeneedle,injectsthesampleintothePTVwhentheheaterispusheddown.Thecarriergasflowthenswitchesdirection,passingthroughthedesorptionvialontothecooledPTV.Allanalytesaretherebyrefocusedontothecooledliner.Aftera3-5minutedesorptionatahightemperature,thePALwillmovethethermaldesorptionunitoutoftheinlet.Atthispoint,theflowwillberedirectedbacktotheinlet,sothatitnolongerpassesthroughthesample.Afterashortequilibrationtime,thePTVinletwillheatrapidlytoitsmaximumtemperature.IfyouchoosetodotheheatingwhilethePTVisinsplitlessmode,itwillprovidemaximumsensitivity.TDAS2000:DirectinjectionintoPTVAmbientAir:5.3litrespretrappeddesorbedwithTDAS2000ApplicationsThermaldesorptionisalong-knowntechnique,whichoffersawiderangeofapplications.MostcommonapplicationsincludegasanalyseswithadsorptionmaterialslikeTenaxorCarbotrap.Foryourconvenience,youcanpurchasepackedtubeswithanykindoftrappingmaterialfromSupelco.Otherapplicationsincludetheanalysisofsolids,whichisanextremelysensitivetechnique.Typicalthermaldesorptionapplicationsinvolvefoodflavor,plasticenvironmentalsamples.Anymaterialcanbepackedintothesampleglasstube.Theuseofaclosedcontainerensuresthatanyanalyteswillstaywithintheglasstube.Moreover,itiseasytotakefieldsamplesanalyzetheminyourlaboratoryatalatertime.