Abstract
A new optical sensor for determination of solvent mixtures (such as water in organic solvent) is based on a fluorescent solvent polarity (SP) probe immobilized on an ion-exchange membrane. The fluorescent probe responds to changes in SP by both a shift in the fluorescence emission maximum and a change in fluorescence quantum yield. In this sensor, the analytical information is the relative fluorescence intensity measured at 620 nm (500 nm excitation). The sensor can be applied over a wide range of solvents. The response time ( t 90) is of the order of 15 s. Given the unique applications of fibre optic sensors (e.g., for remote sensing and sensing in explosive areas), the new sensor is expected to be applicable in process control.
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