Copper(II) selective electrochemical sensor based on Schiff Base complexes

Plasticized membranes using Schiff Base complexes, derived from 2,3-diaminopyridine and omicron-vanilin have been prepared and explored as Cu2+-selective sensors. Effect of various plasticizers viz., dibutyl phthalate (DBP), dioctylphthalate (DOP), chloronaphthalene (CN), tri-n-butylphosphate (TBP) etc. and anion excluder, sodium tetraphenylborate, (NaTPB) was studied in detail and improved performance was observed at several instances. Optimum performance was observed with Schiff Base (B) having a membrane composition of B(1%):PVC(33%): DOP(65%):NaTPB(1%). The sensor works satisfactorily in the concentration range 5.0 x 10(-6) to 1.0 x 10(-1) M (detection limit 0.3 ppm) with a Nernstian slope of 29.6 mV per decade of activity. Wide pH range (1.9-5.2), fast response time (<30 s), high non-aqueous tolerance (up to 20%) and adequate shelf life (>4 months) indicate the vital utility of the proposed sensor. The potentiometric selectivity coefficient values as determined by match potential method (MPM) indicate good response for Cu2+ in presence of interfering ions. The tolerance level of Hg2+. which causes serious interference in the determination of Cu2+ ions (K-Cu2+Hg2+(Pot) (MPM): 0.45), was determined as a function of Cu2+ concentration in simulated mixtures. The sensor was also used in the potentiometric titration of Cu2+ with EDTA. (C) 2004 Elsevier B.V. All rights reserved.