Abstract
We report the development of a novel Nd(III) ion-selective PVC-based membrane sensor, based on 2-{[(6-aminopyridin-2-yl)imino]methyl}phenol (APIMP) as the membrane carrier. The sensor has a Nernstian slope of 19.6±0.3 mV per decade over the concentration range of 1.0× 10−5−1.0×10−2 M, and a detection limit of 2.0× 10−6 M of Nd(III) ions. The potentiometric response of the sensor is independent pH solution in the pH range 3.5–8.5. It has advantages of low resistance, very fast response time (<10 s) and, most importantly, good selectivity with respect to a number of lanthanide ions. Using the proposed membrane sensor in a 6 weeks period caused no significant divergences in its potential response. To assess its analytical applicability the sensor was successfully applied as an indicator electrode in the titration of Nd(III) ion solution with EDTA.
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