Four gas chromatographic stationary phases were used as sensing materials on four piezoelectric quartz crystals. Factor analysis was performed to characterise the selectivity of the coating materials. Based upon the results, an array of the sensors consisting of 4 crystals was developed. Identification of a few volatile organic compounds was carried out by the sensor array. Principal component analysis was used and the signals were transformed into the feature space. The transformed values for chloroform, acetone and cyclohexane were separated. The data of the aromatic hydrocarbons appeared near the values of methanol and pentane. Organic compounds could be determined from a mixture if the calculated factors were different. Interference was observed for benzene and toluene due to the similar factor loading. More chemical sensors have to be incorporated in a sensor array to improve the selectivity of the method.
|Translated title of the contribution||Application of factor analysis for characterisation of piezoelectric chemical sensors|
|Journal||Magyar Kemiai Folyoirat, Kemiai Kozlemenyek|
|Publication status||Published - Oct 1 1997|
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