Abstract
A prototype quartz crystal microbalance-based transducer is proposed for in-situ measurements of very-low chloroform activity. The sensing element consists of a syndiotactic polystyrene thin film sprayed on the piezoelectric quartz electrode of the microbalance. Chloroform adsorption and desorption in the film give rise to a mass variation implying a related variation in the resonance frequency of the crystal. Static and dynamic metrological characterizations of the sensor prototype were carried out at varying chloroform activity and temperature levels. Satisfactory sensitivity, repeatability, and dynamic hysteresis were highlighted.
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