Rubeanic acid as novel carrier in construction of selective membrane sensor for La(III) [An article from: Analytica Chimica Acta]

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Description:
A new polyvinylchloride-based membrane of rubeanic acid as an ion carrier was fabricated using oleic acid as lipophilic additive. The best performance was exhibited by the membrane having composition rubeanic acid:PVC:OA:o-NPOE as 5:180:18:208 (w/w). The sensor exhibited a Nernstian response for La^3^+ over a wide concentration range of 3.2x10^-^8 to 1.0x10^-^2M with a detection limit of 2.5x10^-^8M. It showed response time of less than 15s and could be used for 5 months without any significant divergence. The proposed membrane sensor revealed good selectivity for La^3^+ over a wide variety of other metal ions and can be used in a pH range of 3.5-9.5 and in mixtures containing up to 30% (v/v) non-aqueous content. It was successfully used as an indicator electrode in the potentiometric titration of La(III) against EDTA.