熱脫附 是一種廣泛使用的技術(shù)，它能將 揮發(fā)性 和 半揮發(fā)性 化合物從各種基質(zhì)中萃取和分離出來(lái)。它可以作為一種空氣監(jiān)測(cè)技術(shù)（室內(nèi)、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(diào)料、化妝品、煙草、建筑材料、藥物和消費(fèi)品的有效工具。實(shí)際上，幾乎任何含有揮發(fā)性有機(jī)物的樣品都能使用該技術(shù)進(jìn)行分析。 全自動(dòng)熱脫附 食品分析和香料分析的理想選擇 非常廣泛的應(yīng)用半導(dǎo)體和塑料行業(yè)中固體樣品檢測(cè) "移動(dòng)烤箱"獨(dú)特技術(shù) 容易安裝在氣相色譜儀進(jìn)樣口上方，方便快速安裝和拆除 智能樣品傳送通過(guò)CTC PAL 直接從樣品管熱萃取樣品到GC進(jìn)樣口 加熱爐溫度高達(dá)350℃ 特制聚四氟乙烯插頭和TDAS樣品管密封圈 無(wú)加熱傳送線或閥門切換-無(wú)殘留 適用于大體積進(jìn)樣(liquid N2 or liquid CO2 cooling required) Cycle Composer軟件控制 可配備Agilent ChemStation or ThermoFinnigan Xcalibur 插件 安裝TDAS后，仍然具有CTC所有的已有液體進(jìn)樣、頂空進(jìn)樣、SPME和SPDE等模塊的功能. 性能描述 系統(tǒng)按照如下操作運(yùn)行，首先解吸小瓶,開(kāi)啟脫附管壓蓋, 通過(guò)PAL的進(jìn)樣單元將樣品管從抽樣托盤運(yùn)送到加熱器進(jìn)口。盡快將吸附管放入加熱爐,進(jìn)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(kāi)關(guān),并通過(guò)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(jīng)過(guò)3-5分鐘,在高溫下脫附, PAL把熱脫附單元從進(jìn)樣口移開(kāi). 此時(shí),載氣切入進(jìn)樣口,使之不再經(jīng)過(guò)吸附樣品管. 經(jīng)過(guò)短暫平衡時(shí),PTV進(jìn)樣口迅速升高到它的溫度，如果在加熱時(shí)你選擇PTV在不分流模式，它將提供靈敏度。現(xiàn)在吸附管可以再TDAS加熱爐里繼續(xù)設(shè)定的步驟，否則吸附管將會(huì)運(yùn)回托盤. 選擇適當(dāng)TDAS參數(shù)(例如,解吸溫度、解吸時(shí)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(yīng)用實(shí)例 采用熱脫附系統(tǒng)測(cè)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(yīng)用. CHROMTECH,04/2004(t401e) 熱脫附氣相色譜分析高沸點(diǎn)、高分子量化合物04/2004 (T402e). TDAS 2000: Transports desorption vials automaticly via injection unit Ideal for foodflavor analyses Solid sample analyses for semiconductorplastics industries Easy to use for gas samples, using pre-filled adsorption tubes Sample capacity of up to 296 samples No transfer linesno switching valves. No carryover Crimped sample container. No contamination of sample Easy mounting on top of GC. Quick installationremoval Smart vial transport by PALSystem Direct thermal extraction from sample vial to GC injector. Heater oven temperature of up to 350''C Adaptable to existing PTV injectors Software integrated with HP/Agilent ChemStation or ThermoFinnigan Xcalibur Description CHROMTECH is known for its reliable automation products. Based on that reputation, we have designed an easily attachable thermal desorption system. At the same time, the Combi PAL still performs its headspace, SPMEliquid injections. It can be transformed to a thermal desorption system in five minutes or less. Given CHROMTECH''s background in automation, our focus is on large-sample capacity. Up to 294 samples can be analyzed using our system. The PAL TDAS features a unique, retractable desorption heater that is mounted on top of the GC injector.No heated transfer lines and/or switching valves are in its flowpath. The body of the thermal desorption unit retracts, so that errors related to sample contaminationlow reproducibility are eliminated.Generally, PTV injectors-cooled by liquid nitrogen or CO2-are used in conjunction with our system for thermal desorption analysis. The system works as follows. First, desorption vials, crimped with regular caps, are transported from the sample tray to the heater inlet port by the PAL''s injection unit. As soon as the vial is placed into the heater, the injection unit pushes the vialheater downwards, piercing both vial ends. The bottom of the heater, which is fitted with a syringe needle, injects the sample into the PTV when the heater is pushed down. The carrier gas flow then switches direction, passing through the desorption vialonto the cooled PTV. All analytes are thereby refocused onto the cooled liner. After a 3-5 minute desorption at a high temperature, the PAL will move the thermal desorption unit out of the inlet. At this point, the flow will be redirected back to the inlet, so that it no longer passes through the sample. After a short equilibration time, the PTV inlet will heat rapidly to its maximum temperature. If you choose to do the heating while the PTV is in splitless mode, it will provide maximum sensitivity. TDAS 2000: Direct injection into PTV Ambient Air:5.3 litres pretrappeddesorbed with TDAS 2000 Applications Thermal desorption is a long-known technique, which offers a wide range of applications. Most common applications include gas analyses with adsorption materials like Tenax or Carbotrap. For your convenience, you can purchase packed tubes with any kind of trapping material from Supelco. Other applications include the analysis of solids, which is an extremely sensitive technique. Typical thermal desorption applications involve foodflavor, plasticenvironmental samples. Any material can be packed into the sample glass tube. The use of a closed container ensures that any analytes will stay within the glass tube. Moreover, it is easy to take field samplesanalyze them in your laboratory at a later time.