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Proceedings Paper

Field evaluation of acoustic-wave chemical sensors for monitoring of organic solvents in groundwater
Author(s): Radislav A. Potyrailo; Timothy M. Sivavec; Angelo A. Bracco
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Paper Abstract

An instrument for in-situ monitoring of volatile organics in groundwater at pat-per-billion levels has been developed and field tested. The device is an acoustic wave thickness-shear mode sensor based on a 10-MHa AT-cut quartz resonator coated with a non-polar polymer film. The sensor demonstrates a detection limit of 8 and 12 parts per billion in water for trichloroethylene and toluene, respectively, and a rapid reversible response. This low detection limit is achieved by carefully minimizing the noise level in the electronic detection system, by optimizing the thickness of the sensing polymer film, and by performing measurements in the headspace. Preliminary field test demonstrated good correlation of sensor response with conventional laboratory purge-and-trap/GC analysis.

Paper Details

Date Published: 23 November 1999
PDF: 8 pages
Proc. SPIE 3856, Internal Standardization and Calibration Architectures for Chemical Sensors, (23 November 1999); doi: 10.1117/12.371285
Show Author Affiliations
Radislav A. Potyrailo, GE Corporate Research and Development Ctr. (United States)
Timothy M. Sivavec, GE Corporate Research and Development Ctr. (United States)
Angelo A. Bracco, GE Corporate Research and Development Ctr. (United States)


Published in SPIE Proceedings Vol. 3856:
Internal Standardization and Calibration Architectures for Chemical Sensors
Ronald E. Shaffer; Radislav A. Potyrailo, Editor(s)

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