- GERSTEL
- Agitator/Inkubator
- Automated Liner Exchange (ALEX)
- Automated Tube Exchange (ATEX)
- Centrifugation
- Cooled Injection System (CIS)
- Cryogenic Trapping System CTS
- Disposable Pipette Extraction DPX
- Dynamic Headspace DHS
- Filtration
- Gas sampling system (GSS)
- GRAPHPACK technology
- MAESTRO-software
- Membrane Assisted Solvent Extraction MASE
- Microwave
- MPS Robotic / Robotic Pro
- MPS Workstation, for independent sample preparation.
- mVAP: Multi position evaporation station
- mVORX, Multi Vortex or Orbital Shaker
- Olfactory Detection Port ODP
- On-line SPE for LC: SPExos
- Preparative Fraction Collector PFC
- Pyrolysis for TDU, GERSTEL PYRO
- quickMIX
- Selectable 1D/2D-GC/MS
- Solid Phase Micro Extraction (SPME)
- Solvent Filling Station SFS
- Static Headspace (HS)
- Thermal Desorption System TDS
- TDS-A Autosampler for TDS
- Thermal Desorption Unit TDU
- Thermal Extractor TE
- Tube Conditioner TC
- Tube Standard Preparation System TSPS
- Twister/Stir Bar Sorptive Extraction SBSE
- Ultrasonic bath
- Weighing option
- Agilent
- Leco
- SYFT
- Alpha M.O.S.
- Markes
- The principle of thermal desorption
- Thermal Desorber – Unity xr
- Markes TD autosampler
- Automated canister analysis – CIA Advantage
- In-line air sampling – Air Server 3/8
- 24/7 monitoring with GC analysis – Series 2 TT24-7
- Micro-Chamber/Thermal Extractor
- TD tube conditioner, TC-20
- Sequential sampling of TD tubes – MTS 32
- OI Analytical
- Bruker-IonSense DART
- BioChromato
- Peak Scientific
- IonBench
- VUV Analytics
- References
- Pegasus HT-C
Microwave sample treatment
Technical set-up
GCxGC is gas chromatography in two dimensions. The technical set-up is two columns connected in series, and to obtain additional information from the GCxGC it is necessary to have two columns with different polarities. After column 1 a cryogenic modulator is mounted, which in milliseconds can switch between cold (typically-150 ° C) and hot.
Modulation of effluent from column 1 to column 2.
This causes the effluent from the first column to be re-focused, and by the subsequent heating injected onto the column 2. Column 2 is typically short, 1 m, to obtain a fast elution. The number of seconds (typically about 5 seconds) between two consecutive injections is called “modulation time” and may be adjusted depending on the analyzed components. If this setting is incorrect, “wrap-around” will typically happen, meaning that the last components are not eluted from the column 2, but comes out in the next “5-sec-window”.
Hardware/software requirements
Due to the re-focusing, components which elute from column 2 are considerably sharper, typically in the range of 35 – 200msec, and this puts considerable demands on both hardware (scanning speed) and software.
Moreover, many peaks will elute over two or more “five-second” windows, and this also places considerable demands on the underlying algorithms to provide proper assembly of the peaks and thus quantization of the individual components.
Feel free to send us a message via the contact form and we will reply back as soon as possible.
Contact us on order@msconsult.dk
Or call our main number
+45 44 53 93 66
You must be logged in to post a comment.