A PVC ion-selective membrane electrode based on Cd-tetraphenyl porphyrine as a carrier was prepared fordetermination of MnO۴- ion. This electrode revealed good selectivity toward permanganate ion over a widevariety of anions. Effects of some experimental parameters such as nature of the plasticizer, the amounts ofcarrier and additive, and concentration of the internal solution on the potential response of the proposed sensorwere investigated. The electrode exhibited a sub-Nernstian slope of ۵۱.۰±۱.۰ mV per decade for MnO۴- over aconcentration range of ۳.۳×۱۰-۶-۷.۵×۱۰-۲ M in the pH range ۵.۰-۱۰.۰. The detection limit and response time ofthe electrode were ۱.۷×۱۰-۶ M and ۱۴ s, respectively. The electrode can be used within ۳ days without anyconsiderable divergence in its potential. This electrode was successfully employed for indirect determinationof Mn(II).

Cd- Tetraphenyl Porphyrin, Permanganate Determination, Ion-Selective Electrode, PVC Membrane Electrode