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Analysis of airborne substances by means of microwave thermal desorption

✍ Scribed by Scharf, Juliane ;Sarafin, Rolf

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
475 KB
Volume
18
Category
Article
ISSN
0935-6304

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✦ Synopsis

A method has been developed to enable thermal desorption of airborne substances from solid adsorbents based on active charcoal by means of microwave energy, followed by on-line GC-FID analysis. Ceramic traps were filled with 50 mg of commercially available graphitized carbon black. Adsorption efficiency and desorption conditions for three substances covering a broad range of vapor pressure were investigated. The recovery rate, breakthrough, and linearity of the system were determined by direct fortification with standard solutions, followed by microwave thermal desorption and gas chromatographic separation. The recovery efficiencies were 80-84 %, with a standard deviation of 3-6 %. The correlation coefficient of the linear range between 1 (10 for one of the compounds) and 1000 ng was > 0.999. Initial experiments were performed to investigate the enrichment of the standards from the gaseous state. The recovery rates of the most volatile compound was increased by optimizing the density of the packing.

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