Romain, Anne-Claude[Université de Liège - ULg > Département des sciences et gestion de l'environnement > Surveillance de l'environnement > >]
Nicolas, Jacques[Université de Liège - ULg > Département des sciences et gestion de l'environnement > Surveillance de l'environnement >]
Proceedings of the 8th conference Eurodeur
8th conference Eurodeur
du 19 juin 2001 au 21 juin 2001
[en] electronic nose ; indoor air ; benzene ; toluene ; GCMS
[en] Air composition in dwellings and public buildings is studied by means of gas chromatography and a sensor micro array 01D28 (MICROSENS, Swiss). Only benzene and its alkyl-derivatives are quantified. The micro array 01D28 is composed of six metal oxide gas sensors (SnO2 doped by Pd) equipped with standard or inter-digited electrodes. Isothermal working mode (500oC for all sensors) is applied. Conductivities after 10 minutes of signal acquisition in the studied air are considered as characterizing its chemical composition.
Discriminant Function Analysis (DFA) and different linear regression techniques (Inverse Least Squares, Principal Components Regression and Partial Least Squares) are applied to find a relation between the sensors signals and the indoor air composition as determined by the gas chromatography. The presented results suggest that the monitoring of aromatics substances in the indoor air by means of a micro-array of metal oxide gas sensors is possible. The array distinguishes polluted and non-polluted air and it can even evaluate the concentration of the benzene and the toluene.