Abstract
A fiber-optic chemical sensor for potassium ion is constructed using a plasticized poly(vinyl chloride) (PVC) membrane containing valinomycin. A hydrophobic fluorescent dye of oxazine 750 is covalently bound to PVC, and a fluorescence intensity from the PVC membrane is measured using a visible semiconductor laser as an exciting source. The sensor response is reversible to the potassium ion concentrations in the 10-3-10-1M range, and a selectivity coefficient for sodium ion is 2×10-3. A calcium ion sensor is also constructed using ETH1001 as an ionphore. The sensor reversibly responds to calcium ion in the 10-3-10-1M rage, and the selectivity coefficient for sodium ion is 5×10-4.
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