Abstract
Miniaturized polymer-membrane electrodes (PMEs) for sulfate were constructed by the use of epoxy resin matrix as a material of electrode membrane. The PME, which has the best characteristics among all constructed PMEs, consists of a silver paste coated copper wire as a center substrate and the coating layers of barium sulfate and epoxy matrix incorporating 45 wt% ion exchanger solution of nitrobenzene containing 10 -2M tris-(1, 10-phenanthroline)-iron (II) sulfate. The coating layers were formed on the substrate according to the order above with the thickness of (0.2 0.3) mm at each layer, so that the electrode was moulded in stick shape having about 1 mm outer diameter. The response of the PME were Nernstian for (5 × 10 -5 1.5 × 10 -2) M activities of sulfate. The noise of the PME on electrode potential was within ± 0.5 mV. The allowable concentration for inorganic monovalent anions as interferences, which give rise to 10% of error (= 3 mV) on response potential, was (5.6 × 10 -5 1.6 × 10 -4) M when the sample contained 1.0 × 10 -3 M sulfate.
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