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Thermal Desorber - SRI Instruments
Thermal Desorber
74-75
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Volatile & Semivolatile compounds in Solid Matrices
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Mounts in the Valve Oven on the 8610C GC
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High Temperature & High Sensitivity
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Manually Actuated 10-port Valve
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No solvent extraction required
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Simple to Use
The SRI Thermal Desorber permits volatile and semi-volatile compounds in soil, or other solid matrices, to be injected
and analyzed with little or no sample preparation, and with very high sensitivity. With the Thermal Desorber, no
solvent extraction is required. This is a major convenience for field operations, and helps save on costs. Little operator skill
is needed, and 4-10 analyses can be run per hour, depending on specific requirements.
Because of the large sample size
up to one gram, an analyte present in the soil at 1ppm desorbs 1000 nanograms onto
the GC column. This results in detection limits in the ppb range for most compounds. Sandy soil can typically be
desorbed with no sample preparation at all. Clay soil is first mixed with sodium sulfate granules to break the clay into a
fine powder coating the granules, then the clay and sodium sulfate mix is desorbed.
This chromatogram is from a GC
with a Thermal Desorber and an
. Synthetic diesel
range samples like this are used
to verify complete desorption.
Sample: 2000ng synthetic diesel
range organics desorbed from
soil.