Liquid-membrane type 8-quinolinol-5-sulfonate ion selective electrode and its application to potentiometric titration

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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 2 qs correspond to the values of the negative logarithm of the acid dissociation constant of H 2 qs. The present electrode was successfully applied to the potentiometric titration of copper(II) with H 2 qs.

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