A Dynamic Electrode for the Estimation of Praseodymium(III) using 1,5-Bis-(o-aminophenol)-3-thiapentane as an Ionophore.

ABSTRACT

This study is related with the development of Pr3+ selective membrane sensor using 1,5-Bis-(o-aminophenol)-3-thiapentane as a neutral carrier. The sensor with membrane composition of 33% PVC, 54%, o-NPOE, 8% NaTPB and 5% ionophore, exhibits a Nernstian response for Pr3+ ion, with a wide concentration range of 3.0 × 10-9-1.0 × 10-2 mol/L, low detection limit (1.0 × 10-9 mol/L) and slope of 23.50.3mV decade-1 of activity with in pH range of 2.0-8.8 and fast response time of 7s. The sensor was also found to work satisfactorily in partially non-aqueous media up to 25% (v/v) content of methanol, ethanol or acetone and could be used for a period of 8 months without any change in response characteristics. The proposed membrane electrode was successfully applied as an indicator electrode for the titration of Pr3+ ion (1.0 × 10-3 M) with a standard EDTA solution (1.0 × 10-3 M).