Thermal Desorption Sorbent Tubes
Hot oil or steam circulates through the auger to heat the soil indirectly. Based on the operating temperature of the desorber, thermal desorption processes can be categorized into two groups: high temperature thermal desorption HTTD and low temperature thermal desorption LTTD.
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It is important to note that thermal desorption does not to destroy organics. LTTD is most often used for remediating fuels in soil.
Many Sampling Options, No Extraction Interferences
Unless heated to the higher end of the LTTD temperature range, organic components in the soil are not damaged, which enables treated soil to retain the ability to support future biological activity. Treatment of the off-gas must remove particulates and contaminants. Particulates are removed by conventional particulate removal equipment, such as fabric filters.
Contaminants are removed through condensation followed by carbon adsorption , or they are destroyed in a secondary combustion chamber or a catalytic oxidizer. Limitations and Concerns. Treatment and control of air emissions from thermal desorption operations is an extremely important consideration.
Mercury emissions are very difficult to control, and using an afterburner is unacceptable. Dust and organic matter in the soil increase the difficulty of treating off-gas. Leaching mercury from stockpiled soil into water is of concern, especially for communities that rely on fishing.
Thermal desorption for mercury-contaminated waste is generally not appropriate. Dewatering may be necessary to achieve acceptable soil moisture content levels. Soil storage piles should be covered to protect from rain to minimize soil moisture and infiltration and from wind. Heavy metals in the feed may produce a treated solid residue that requires stabilization.
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Clay and soils with high humic content need longer reaction time. Treated soil may no longer be able to support microbiological activity that breaks down contaminants. If the soil is returned to a previously or partially contaminated site, this may be of concern.
Sorbent Tubes for Thermal Desorption, SKC, Inc.
Thermal desorption uses heat, instead of solvent extraction , to release organic compounds from the adsorbent and transfer the entire collected sample to a gas chromatograph for analysis. This eliminates extraction time, typically hours , a solvent peak in the chromatogram which can mask compounds of interest , and waste solvent disposal, an increasing expense in many labs.
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The process is flexible and convenient. For example, an investigator equipped with a battery-powered sampler can quickly collect liters of air on a sorbent tube and bring it to the lab for analysis. When samples are collected in areas of high humidity, two-stage sorbent trapping and thermal desorption effectively eliminate water interferences and enhance analysis of polar compounds in the sample stream. Other collection techniques, such as canister sampling, must limit sampling volumes to control the amount of water transferred to the GC, which tends to lower sensitivity as well as restrict recovery of polar compounds.
CDS's base model instrument for single tube desorption. CDS supports continous real time air monitoring through a dual tube setup.
Stand-alone 72 position Thermal Desorption system. CDS's single and six tube conditioners are essential accessories for your analysis. Thermal Desorption Series. CDS