Quantification of Quaternary Mixtures of Low Alcohols in Water: Temporal-Resolved Measurements with Microporous and Hyperbranched Polymer Sensors for Reduction of Sensor Number

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• 作者：Matthias Vollprecht ; Frank Dieterle ; Stefan Busche ; Gü ; nter Gauglitz ; Klaus-Jochen Eichhorn ; and Brigitte Voit
• 刊名：Analytical Chemistry
• 出版年：2005
• 出版时间：September 1, 2005
• 年：2005
• 卷：77
• 期：17
• 页码：5542 - 5550
• 全文大小：802K
• 年卷期：v.77,no.17(September 1, 2005)
• ISSN：1520-6882

文摘

The focus of this study is the quantification of multianalytemixtures in water by the use of sensor arrays based onpolymer layers. Reflectometric interference spectroscopyis used as a optical sensor system for temporal-resolvedmeasurements of the interaction kinetics of analytes inwater with the polymer layers. The principles and widespread possibilities of this approach are demonstratedusing the quantification of quaternary aqueous mixturesof low alcohols from methanol up to 1-butanol. Thesensitive layers consist of two hyperbranched polyestersand one microporous polyimide. Different time-dependentsensor signals are evaluated by artificial neural networks.Because the kinetics of sorption and desorption of theanalytes differ significantly, the number of sensors neededfor a quantification of analytes in mixtures can be reduced.A feature extraction allows identification of the mostimportant differences of kinetic patterns of the analytesand allows improvement of the multivariate calibration.It is shown that a quantification of quaternary mixturesof methanol, ethanol, 1-propanol, and 1-butanol is possible on the basis of only two polymer sensors.