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- Title
Gas-phase pre-concentration for a quartz crystal microbalance based electronic nose.
- Authors
Ali, Z.; James, D.; O'Hare, W. T.; Rowell, F. J.; Scott, S. M.
- Abstract
The effect of different relative humidity (RH) on the response of a six-polymer coated Quartz Crystal Microbalance (QCM) sensor based electronic nose (EN) was investigated, RH 30 and 50% respectively. Increases in the sensor responses were observed for an increase in RH. A stainless steel pre-concentration tube (PCT) containing Porapak-S and a nichrome heating element was developed to minimise the effect and allow for chromatographic pre-separation. Breakthrough times of chemical compounds through the PCT were experimentally determined and used to select a mixture of water and toluene as a suitable sample for pre-separation. The PCT was capable of separating the water from the toluene and the EN was competent at evaluating the concentration of toluene in the solution.
- Subjects
CHEMICAL detectors; QUARTZ crystal microbalances; HUMIDITY; TOLUENE; SEPARATION (Technology); WATER
- Publication
Journal of Thermal Analysis & Calorimetry, 2003, Vol 71, Issue 1, p163
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1023/A:1022226503236