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A polyvinyl chloride (PVC) membrane based Pr(III) selective electrode was constructed using 1,6,7,12-tetramine-2,5,8,11-tetraoxo-1(12),6(7)-di(biphenyl)dodecane (TATODBDD) as a neutral carrier. The sensor exhibits a Nernstian response for Pr(III) ions, a wide concentration range of 3.9×10-7 -1.0×10 -1 mol/L with a detection limit of 5.0×10 -8 mol/L and slope of 19.5 mV/decade. The developed sensor revealed relatively good selectivity and high sensitivity for Pr(III) ions over the other lanthanide ions. The potentiometric response of the sensor is independent in the pH range 2.9-9.5. The advantages of sensor are low resistance, very fast response time (＜10 s) with good selectivity. This sensor can be used up to 6 weeks without any divergences in potential response.

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