Photoionization Detector for Portable Rapid GC |
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Authors: | F M Peng P H Xie Y G Shi J D Wang W Q Liu H Y Li |
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Institution: | (1) Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, 230031, China;(2) Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China |
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Abstract: | With the development of portable rapid gas chromatography (GC) for environmental monitoring the photoionization detector (PID)
has potential application. The frequent calibration required and the relatively large dead volume have limited the use of
the PID, however. An improved PID which resolves these problems is proposed in this paper. Compared with a commercial instrument,
signal generation, the main aspect of the improved PID, has also been optimized. In the improved PID the sample is directed
to flow across the lamp window, rather than toward the lamp, and a new, simple automatic self-cleaning technique, which effectively
eliminates contaminants and substantially reduces drift, has also been adopted. Use of new electrodes has effectively reduced
the background noise and dead volume of the PID. As a result of this new design the PID should be more compatible with rapid
portable GC in environmental monitoring, because of elimination of most of the tedious cleaning and calibration previously
necessary. |
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Keywords: | Gas chromatography Photoionization detection Environmental monitoring |
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