Abstract
A nitrobenzene extract of the ion-pair consisting of 8-quinolinol-5-sulfonate (Hqs −) and the cation of zephiramine (Z +Cl −, benzyldimethyltetradecylammonium chloride) was used as an ion-exchanging liquid membrane for the electrode responding to Hqs − ion. The potential response showed the Nernstian slope with the Hqs − activities varying from 10 −2 to 10 −4.5 mol l −1. The break points in the potential-pH plot with the constant analytical concentration of H 2qs correspond to the values of the negative logarithm of the acid dissociation constant of H 2qs. The present electrode was successfully applied to the potentiometric titration of copper(II) with H 2qs.
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