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Proceedings Paper

Real-time online detection of organic compounds in aqueous environments using polymer-coated QCRs
Author(s): Fabien J. Josse; Rongnong Zhou; Rupa Patel; Ashok Menon
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Paper Abstract

Quartz crystal resonators (QCR) coated with various selected sensitive polymers have been investigated for the detection of organic compounds in liquid phase. The targeted organic compounds are tetrachloroethane, trichloroethylene, tetrachloroethane, chloroform, toluene, and xylenes in aqueous solutions. Under optimized experimental conditions using properly designed measurement flow cells and oscillator circuits, proper flow rate, and different coating thicknesses, low detection limits for organic compounds have been achieved. Detection limits as low as 150 ppb and 500 ppb have been achieved with short response time, reversibility and reproducibility using PEA-coated QCR operating at the series-resonant frequency, fs, for tetrachloroethane and trichloroethylene, respectively. Such limits together with the response time clearly indicate that the coated sensors can be used for real-time water analysis. Moreover, using the measured frequency changes, the partition coefficients, KL, of the analyte molecules in the coating/water composite are discussed in order to analyze the sensor mechanism and implement sensor and sensor arrays. Preliminary results on the detection of binary mixtures of analytes are presented and discussed.

Paper Details

Date Published: 18 December 1998
PDF: 10 pages
Proc. SPIE 3539, Chemical Microsensors and Applications, (18 December 1998); doi: 10.1117/12.333755
Show Author Affiliations
Fabien J. Josse, Marquette Univ. (United States)
Rongnong Zhou, Marquette Univ. (United States)
Rupa Patel, Marquette Univ. (United States)
Ashok Menon, Marquette Univ. (United States)

Published in SPIE Proceedings Vol. 3539:
Chemical Microsensors and Applications
Stephanus Buettgenbach, Editor(s)

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