Dynatherm instruments capture compounds of interest on adsorbent material packed in glass cartridges, and then introduce the collected chemicals into a gas chromatograph, where the various components are separated, measured and identified. Thermal desorption uses heat instead of solvent extraction to release organic compounds, so there is no long extraction time and no solvent peak in the chromatogram. Two sorbent traps operate in series: the first high-capacity sorbent trap retains desired compounds from large sampling volumes; the second capillary-bore focusing trap injects the collected sample onto a capillary column in a narrow-band plug. Transferring the analytes to the focuser improves injection efficiency, since liters of flow may have been required during sampling to collect enough mass to meet the requirements of the detector. Water interference is minimized: carrier gas evaporates water vapor from the absorbent tube and vents it from the unit with no sample loss. And, Dynatherm instruments are made to facilitate remote sampling by battery-powered air sampler or direct source sampling with a mobile desorber/GC platform.
- Evaluate long-and short-term chemical exposures
- Establish safe/unsafe perimeters for hazmat incidents, remediation sites and chemical weapons demilitarization
- Support occupational safety, industrial hygiene and environmental methods
- Assess air toxins/VOCs for ambient and indoor air quality
- Food, flavor and fragrance analysis
- Out gassing and product purity evaluations
Building on the success of the 900 series ACEMs (over 600 sold to Chemical Demilitarization projects throughout the U.S.), the 9300 series offers multiple configurations of the basic thermal desorber to provide maximum flexibility. All versions include two tube chambers that accept 6, 8 or 10 mm OD tubes.
Three Models to choose from:
9300 – Two stage, single tube Thermal Desorption unit
9305 – Adding a vacuum pump and a mass flow controller the unit can be used for near-real time sampling and thermal desorption as well as a single tube desorber.
9350 series – Continuous sampling with near real time analysis, the 9350 series can be modified to either use a focus trap or desorb directly to an analytical Instrument.
Which Desorber Fits My Needs?
|
Model |
Function |
Sample Tubes |
Focus Tubes |
# of Valves |
Mass Flow Controller |
Notes |
|
9300 |
Desorb a single tube |
1 |
1 |
1 |
No |
Basic single tube desorption system |
|
9305 NRT |
Near-real time sampling |
1 |
1 |
2 |
Yes |
Introduce samples with a vacuum pump or pressurized cylinder |
|
9350 series |
Continuous sampling |
2 |
1 or 2 |
2 |
Yes or No |
Continuous sampling and desorption system
|
