Abstract
Piezoelectric quartz crystal detectors with several coating materials sensitive to sulphur dioxide and ammonia are used as model sensors for the optimization of a flow-injection measuring system with a gaseous carrier. As factors affecting the quality of detector response, the amount of coating material and its distribution on the quartz oscillator surface, the composition, flow rate and purity of the gaseous carrier, the design of the flow-through detector, the temperature and the injection volume are considered. The experimental data obtained illustrate the significance of careful optimization of these parameters for the detectability, stability and reproducibility of flow-injection analysis in the gaseous phase with piezoelectric detection.
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