Construction of an Ion-Selective Eelectrode for Determination ofpermanganate Ion

A PVC ion-selective membrane electrode based on Cd-tetraphenyl porphyrine as a carrier was prepared fordetermination of MnO4- 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 51.0±1.0 mV per decade for MnO4- over aconcentration range of 3.3×10-6-7.5×10-2 M in the pH range 5.0-10.0. The detection limit and response time ofthe electrode were 1.7×10-6 M and 14 s, respectively. The electrode can be used within 3 days without anyconsiderable divergence in its potential. This electrode was successfully employed for indirect determinationof Mn(II).