Membrane and trap system for continuous monitoring of volatile organic compounds using a portable gas chromatograph with thermal conductivity detector
✍ Scribed by Ionel Ciucanu; Adrian Chiriac
- Publisher
- John Wiley and Sons
- Year
- 2002
- Tongue
- English
- Weight
- 270 KB
- Volume
- 25
- Category
- Article
- ISSN
- 1615-9306
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✦ Synopsis
Membrane and trap system for continuous monitoring of volatile organic compounds using a portable gas chromatograph with thermal conductivity detector A device for continuous monitoring of volatile organic compounds by collection of analytes by membrane permeation followed by their concentration on a solid sorbent and injection into a gas chromatograph on thermal desorption is presented. The transfer line between the small trap and the gas chromatograph is a resistance-heated silicosteel capillary column which effects pre-separation or separation of analytes. The device performs automatic injections, is portable because it is powered by a 12-V DC battery, and is light since it incorporates a small carrier gas cylinder and a micro thermal conductivity detector (TCD). Factors affecting the sensitivity of the TCD in the membrane and trap system were evaluated. Separation is performed in less than 30 s for benzene, toluene, trichloroethylene, and tetrachloroethylene, the resolution and peak shapes are very good, and the limits of detection under these experimental conditions were 25 ppt, 30 ppt, 85 ppt, and 90 ppt, respectively. The device was tested for continuous monitoring of thermo-oxidative degradation products of polystyrene.