Thermal Desorption Tubes
Thermal Desorption Tubes - Related Videos
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Rapid Collection of Floral Fragrance Volatiles using a Headspace Volatile Collection Technique for GC-MS Thermal Desorption Sampling
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Here, we present a protocol for collecting the floral fragrance volatiles from blooming flowers, using a non-destructive sampling procedure.
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Analysis of Thermal Expansion via Dilatometry
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Source: J. Jacob Chavez, Ryan T. Davis, and Taylor D. Sparks, Department of Materials Science and Engineering, The University of Utah, Salt Lake City, UT Thermal expansion is extremely important when considering which materials will be used in systems that experience fluctuations in temperature. A high or low thermal expansion in a material may or may not be desirable, depending on the application. For instance, in a common liquid thermometer, a material with a high thermal expansion would be...
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Tube Thoracostomy
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Thermal Diffusivity and the Laser Flash Method
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Thermal expansion and Thermal stress: Problem Solving
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2023
San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures? To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55 °C.
FAQs
The sorbent bed provides the chemical retention step during sampling. As air or another gas moves through the tube, volatile and semivolatile compounds are held on that material rather than continuing with the gas stream. This captures analytes from a larger gas volume and concentrates them, supporting detection of trace organic compounds during later analysis.
Controlled heating reverses the retention step without adding an extraction solvent. The released compounds enter a carrier-gas stream, which transfers them toward gas chromatography. Chromatographic separation helps resolve components in a complex mixture, while subsequent detection provides analytical information for identifying or characterizing the collected organic compounds.
Removing solvent use can simplify the transition from collection to instrumental analysis. The compounds are released directly into a carrier-gas stream for chromatographic separation and detection, so the workflow reduces sample handling while retaining the ability to examine trace organic compounds. This is particularly relevant when chemists need to characterize complex mixtures from gas-phase samples.
Concentration matters because collected compounds may occur at trace levels in the sampled gas. Retaining them on the sorbent and subsequently releasing them into a carrier-gas stream supports sensitive chemical analysis. This step helps chemists obtain useful chromatographic and detection information from environmental, workplace, industrial, or indoor-air samples.
An analysis begins by passing air or another gas through a sorbent-packed tube so target compounds are collected. The tube is then heated under controlled conditions, and a carrier-gas stream transports the released compounds into gas chromatography. Separation and detection provide the basis for examining the sample’s organic composition.
These tubes support sampling in environmental air, workplace exposure, industrial emissions, and indoor-air studies. Across these settings, they allow chemists to collect and concentrate volatile and semivolatile organic compounds before instrumental analysis. The resulting chromatographic information can help characterize the chemical composition of complex gas-phase samples.
The workflow provides a route from gas-phase sampling to chromatographic identification and detection. Heating releases the collected compounds, while gas chromatography separates components within the mixture. Together, these stages help chemists characterize complex mixtures and evaluate trace organic compounds in samples relevant to environmental, occupational, industrial, and indoor-air investigations.