Abstract
The ion-exchange capacity of the gel layer of some hydrogen-ion-selective glass electrode types was measured in isopropanol and it was found to be of the order of 10−8 mol cm−2 glass bulb area. This amount corresponds to a saturation of only a few percent of the sites in the gel layer. A relatively large fraction of the ion exchange took place before any potentiometric deviation from Nernst's law was observed. The exchange process was faster when hydrogen ions initially were present in the gel layer and were replaced by alkali metal ions compared with the reverse process. The pattern of the ion exchange with time could be related directly to the slow potential variations with time occurring after a transfer of the electrode between an acidic and a basic isopropanol solution.
Published Version
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