Abstract
Erythromycin sensitive electrodes have been proposed. Their selectivity toward quaternary ammoniums is described in terms of induction effect and steric hindrance effect: logKij = a1I-a2Z/R + a0, where I is induction effect index, a1, a2 and a0 are coefficients which depend on the electro-active material. A general formula has been suggested to relate the electrode selectivity to the carbon atom number (n) of the alkyl of the quaternary ammonium; logKij = A/2.7n-B/(0.80+1.26n)+C, where A, B and C are coefficients which depend on the electro-active material. logKij tends to a limited value C when n increases.
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