摘要
Erythromycin sensitive electrodes have been proposed. Their selectivity toward quaternary ammoniums is described in terms of induction effect and steric hindrance effect: logKil=a<sub>1</sub>I-a<sub>2</sub>Z/R+a<sub>0</sub>, where I is induction effect index, a<sub>1</sub>,a<sub>2</sub> and a<sub>0</sub> 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; logK<sub>ij</sub>=A/2.7<sup>R</sup>-B/（0.80+1.26n）+C, where A, B and C are coefficients which depend on the electro-actlve material, logK<sub>ij</sub> tends to a limited value C when n increases.
Erythromycin sensitive electrodes have been proposed. Their selectivity toward quaternary ammoniums is described in terms of induction effect and steric hindrance effect: logKil=a_1I-a_2Z/R+a_0, where I is induction effect index, a_1,a_2 and a_0 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; logK_(ij)=A/2.7~R-B/(0.80+1.26n)+C, where A, B and C are coefficients which depend on the electro-actlve material, logK_(ij) tends to a limited value C when n increases.
