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Performance and characteristics of a trace gas analyzer for the determination of volatile organic compounds in air

✍ Scribed by Munari, Fausto ;Mapelli, Gian Pietro ;Kotzias, Dimitrios ;Duane, Matthew

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
557 KB
Volume
19
Category
Article
ISSN
0935-6304

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✦ Synopsis

Abstract

An instrument has been developed and tested for the continuous measurement of volatile organic compounds (VOC) in air. The system consists of a gas chromatograph equipped with a dedicated sampling device that allows the sample to be transferred to a cooled microtrap via sampling loops (10, 100, 250 ml) or via a direct pump transfer to the trap. The microtrap is placed in the chromatographic oven just below a modified split‐splitless injector, allowing direct liquid injection for calibration of the system; the injector is in communication with the sampling valve equipped with the loop and the sampling pump. The system allows 24‐hour sampling and analysis of a large number of VOC (up to 25 individual hydrocarbons ranging from C2ο£ΏC9) and also polar volatile organic compounds PVOC. Thanks to the particular trap geometry, a minimum consumption of liquid nitrogen (between 150ο£Ώ300 ml) is needed for each analytical run and no water managing system is normally required for humid air samples.

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