Thermal Desorption Tubes: Versatile Air Sampling for a ...

1 Thermal Desorption TubesVersatile Air Samplingfor a Wide Range of Applications Sensitive concentrated sample collection to ppb/ppt levels. Versatile variety of sorbents to collect wide range of VOCs. Efficient reusable, time-saving alternative to solvent Desorption 1-800-356-1688 1-814-353-1300 Figure 1 Thermaldesorption Desorption : A Versatile Techniquefor a Wide Range of VOC ApplicationsWhat is Thermal Desorption ? Thermal Desorption (TD) is a highly sensitive alternative to conventional sample collectionprocedures for volatile and semivolatile compounds, such as solvent Desorption tubes . It ismore efficient than other extraction methods and allows the selective concentration of targetanalytes, making it ideal for trace-level analysis by gas chromatography (GC/MS) across a wide rangeof applications.

2 Thermal Desorption is the process of collection and Desorption of analytes from solidsorbents using heat and a flow of inert gas, rather than solvent extraction. Analytes are then focused on acold trap prior to entering the analytical column, resulting in higher responses and narrow, moresymmetric peaks. This is accomplished by interfacing a Thermal Desorption unit with a GC/MS (Figure1). TD is highly sensitive and can significantly lower detection limits, by as much as 103, as it allows waterto be purged, further facilitating the selective concentration of the compounds of interest. Thermaldesorption tubes can be sampled actively with a Sampling pump, or passively with a diffusion cap, andare Desorption has many air monitoring applications in a wide variety of industries includingindustrial hygiene, environmental air monitoring, odor profiling in the food and flavor industry, defenseand forensic applications, and material emissions testing.

3 TD is also compatible with many samplematricies in addition to air including solids (powders, fibers, films and granules), resins, pastes, liquids,and emulsions (Figure 2). Common applications include: Workplace exposure monitoring. Indoor/outdoor air testing. Soil, water, and biological volatiles. Residual volatiles, solvents etc. Odor profiling for flavor and fragrance testing. Fire debris, chemical warfare agents. Material emissions from numerous consumer Desorption works well for almost all volatile, and many semivolatile compounds, andconcentrations from ppm to ppt can be analyzed reliably. TD can be used for any volatile organiccompound that is easily analyzed by GC, provided the sample matrix is compatible with the hightemperatures required.

4 Generally, this technique is not suitable for less volatile compounds, orcompounds that are either not compatible with standard gas chromatography, or that require specialcare during GC analysis ( , on-column injection).Almost all other volatile compounds respond well,and a variety of sorbents are available to maximize the range of VOCs collected. Specifications andmethod applications for Restek Thermal Desorption tubes can be found on page sensitivity and efficiency improvements can be realized through Thermal Desorption . It is aversatile technique, suitable to many GC applications that require trace-level analysis of volatilecompounds. Compare Thermal Desorption tubes to canister Sampling using the chart on page 4 todetermine which technique is right for 2 Thermal Desorption is compatible with a wide range of Sampling air/gas samplingDirect desorptionof materials100-200 L injectionof vapor into GC/MSVapors sampledonto sorbent tubesHeadspace-trapor Thermal patents and trademarks are the property of Restek Corporation.

5 Other trademarks appearing in Restek literature or on its website are the propertyof their respective Desorption Unit (TDU) tubes Variety of sorbents to collect a wide range of VOCs. Use glass tubes for maximum inertness in active Sampling . Choose stainless steel tubes for either active or passive Sampling . No Sampling pump necessary forpassive Sampling with diffusion caps! Individually etched with unique serial number for convenient sample identification. Available unconditioned or preconditioned and ready to sample. tubes are reusable after Thermal Desorption tubes by Markes International. These sorbent tubes are suitable for pptto ppm concentrations of volatile organic compounds (VOCs) in ambient, indoor, and industrial hygieneenvironments.

6 Available in both stainless steel and glass (for thermally labile VOCs), they fit MarkesULTRA-UNITY, PerkinElmer, and Shimadzu Thermal desorbers. Packed tubes come with a report detail-ing the total mass of sorbent in the tube; conditioned tubes also include a blank DDeessoorrppttiioonn TTuubbee SSoorrbbeennttAApppplliiccaattiioonnssTe nax TAVapor phase organics from C6/7 to C26 Graphitized CarbonVapor phase organics from C5/6 to C14 Tenax GR/Carbopack BVapor phase organics from n-C5/6 to n-C20 (EPA Methods TO-14A/TO-15/TO-17)Carbopack B/Carbosieve SIIIV apor phase organics from n-C2/3 to n-C12/14 (EPA Methods TO-14A/TO-15/TO-17) Tenax TA/Graphitized Carbon/Carboxen 1000 Vapor phase organics from C2/3 to C20 Carbopack C/Carbopack B/Carbosieve SIIIV apor phase organics from n-C2/3 to n-C16/20 (EPA Methods TO-14A/TO-15/TO-17)methodapplicationsMMe etthhooddAApppplliiccaattiioonnUS EPATO-17 ASTMD-6196 NIOSH2549 DIN EN ISO16017 SSppeecciiffiiccaattiioonnssDimensions.

7 1/4" OD x 3-1/2" longLow Sampling rates: L/min. (<10L total volume)Long-term storage caps aresupplied with conditioned tubesThermal Desorption Unit tubes , Unconditioned and Conditioned & CappedUUnnccoonnddiittiioonneeddCCoonndd iittiioonneedd && CCaappppeeddSSttaaiinnlleessss SStteeeellGGllaassssSSttaaiinnlleessss ## ## ## ##pprriicceeTDU tubes , Tenax tubes , Graphitized tubes , Tenax GR/Carbopack tubes , Carbopack B/Carbosieve tubes , Tenax TA/Graphitized Carbon/Carboxen tubes , Carbopack C/Carbopack B/Carbosieve ## ##pprriicceeTDU tubes , Desorption Unit tubes , EmptyThermal Desorption Unit tubes , AccessoriesThermal Desorption Unit tubes , " Brass Cap and PTFE FerrulesLong-term storage of blank/sampled " PTFE FerrulesLong-term storage ToolUse for tightening long-term storage ToolAssists with tube " Stainless Steel Union and PTFE FerrulesUse for connecting tubes in CapsRequired for diffusive Sampling with stainless steel ## ##pprriicceeTDU tubes , Calibration, Tenax TA 1cm Solution Loading Solution Loading Rig Replacement Reference Standard, 100ng BTX on Tenax Desorption tubes vs.

8 Canister SamplingUse the information below to determine which VOC Sampling technique is best suited foryour Thermal Desorption tubes and CanistersTThheerrmmaall DDeessoorrppttiioonn TTuubbeessCCaanniisstteerrssMMeetthhoodd ssUS EPA TO-17; ASTM D6196; ISO 16017;ISO 16000-6; NIOSH 2549US EPA TO-14A, TO-15; ASTM D5466 OSHA PV2120; NIOSH Protocol DraftWorld-wide acceptanceGold standard for US ambient air marketAApppplliiccaattiioonnssAmbient air, indoor air, industrial hygieneMaterial emissionsFood & flavorChemical weaponsAmbient air, indoor air, vapor intrusion, emergency responseC3 to C30<C3 to ~C10 HHaannddlliinnggLight weight for personal monitoring and general ease of useLarger and heavier; more costly to shipSSaammpplliinnggActive Sampling with Sampling pump or diffusive Sampling without pump is possible with determined diffusion coefficients for each Sampling , no Sampling pump required.

9 Long-term Sampling possible without battery to Sampling onlyGrab & integrated samplingConcentrated sampleWhole airProper sorbent selection recommended in sample below sorbent breakthrough volumes to avoid sample loss and irreversible adsorption on sorbentN/ALarge sample volumes >100 LSample volume is function of canister size, 15L maxAAnnaallyyssiissTube dimensions are instrument specificCompatible with all manufacturer sample concentrators1 injection, more injections possible for some instrumentationMultiple sample injectionsConcentration range ppt to ppmPpt to ppmSome sorbents prone to artifact blanks when properly storage at 4 C recommended for multi-bed tubes to prevent potential migration of compounds to more retentive sorbent which maybe difficult to temperature CClleeaanniinnggAnalytical process automatically cleans tube for reuse.

10 Cleans as it analyzes. Conditioning/cleaning and analysis incorporated in one Thermal Desorption cleaning requires separate equipment asadditional step prior to background certification $50-130 each$200-700 eachDifferencesBetween Thermal Desorption tubes and CanisterstechguidesThermal Desorption applicationguides are available for a broadrange of markets. Request yourFREE copy today using these AAiirr MMoonniittoorriinngg aanndd OOccccuuppaattiioonnaall HHeeaalltthh && SSaaffeettyyEVTG1034 RReessiidduuaall VVoollaattiilleess && MMaatteerriiaallssEEmmiissssiioonnss TTeessttiinnggGNTG1035 DDeeffeennssee && FFoorreennssiiccCFTG1036 FFoooodd,, FFllaavvoorr,, FFrraaggrraannccee && OOddoorr PPrrooffiilliinnggFFTG1037 Reusable Sampling device.