A cheap alternative to valinomycin for certain analyses with the potassium ion-selective electrode |
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| Authors: | RW Cattrall LW Deady SS Tan IC Hamilton |
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| Institution: | Department of Chemistry, La Trobe University, Melbourne, Victoria 3083 Australia;BHP Central Research Laboratories, Newcastle, New South Wales 2287 Australia |
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| 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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