Abstract
The use of potentiometric detection in ion-exclusion chromatography of carboxylic acids (oxalic, citric, tartaric, malic, lactic, succinic and acetic acid) is reported. A comparison of the performance characteristics of potentiometric detection with those obtained by UV absorbance is given. A treatment of the electrode response characteristics, based on ionic equilibria in the bulk solution, is presented in order to determine the mechanism of response at the indicator electrode. The results show that the response is Nernstian and arises as a result of the effect of solute species on the concentration of Cu(II) generated at the electrode surface. Experimental data for inorganic anions and aliphatic acids show close agreement with the theoretical response. The selectivity of the potentiometric detector is illustrated by reference to the analysis of white wine.
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