Abstract
A pyridine-based macrocylic ionophore containing a 15-membered ring cavity and an octoxy side-chain to confer compatibility with poly(vinyl chloride) is described. This cheap reagent gives a potassium ion-selective PVC membrane electrode which, except for a higher sodium interference, compares well with valinomycin for analyses where the sodium/potassium ratio is ⩽1. Near-Nernstian response is obtained for 10 −1–10 −5 M potassium ion.
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