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Lanthanide Recognition: Monitoring of Praseodymium(III) by a Novel Praseodymium(III) Microsensor Based on N′-(Pyridin-2-Ylmethylene)Benzohydrazide

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5 Author(s)

In this work, for the first time, we introduce a highly selective and sensitive praseodymium(III) microsensor. Npsila-(pyridin-2-ylmethylene)benzohydrazide (PBH) was used as a membrane-active component to prepare a highly sensitive Pr(III)-selective polymeric membrane microelectrode. The electrode exhibits a Nernstian response toward Pr(III) ions over a very wide concentration range (1.0 times 10-3 -1.0 times 10-8 M), with a detection limit of 7.0 times 10-9 M (~1 ng/ml). It has a very fast response time in the whole concentration range (~10 s). The proposed microelectrode can be used for at least six weeks without any considerable divergence in potentials. The proposed membrane sensor revealed very good selectivity toward Pr(III) ions over a wide variety of other metal ions including common alkali, alkaline earth and, specially, lanthanide ions. It could be used in the pH range of 3.0-8.5. The Pr(III) microelectrode was used as an indicator electrode for the titration of 20 ml of a 1.0 times 10-6 M Pr(III) ions with a 1.0 times 10-4 M EDTA.

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Sensors Journal, IEEE  (Volume:7 ,  Issue: 8 )