This paper illustrates work at the University of Wales College of Cardiff (formerly UWIST) relating to the development and applications of membrane systems in various modes for possible use in environmental analysis. Three main types are illustrated, namely, membranes coated on quartz crystals for piezoelectric monitoring of gases and vapours, membranes used as the sensing components of potentiometric ion sensors, and catalytic enzyme membranes used for converting analyte components into suitable forms for electrochemical sensing.
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