Copper(II) selective electrochemical sensor based on Schiff Base complexes |
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Authors: | Singh Lok P Bhatnagar Jitendra M |
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Institution: | Central Building Research Institute (CBRI), C.P. Divison, CBRI, Roorkee 247667, India |
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Abstract: | Plasticized membranes using Schiff Base complexes, derived from 2,3-diaminopyridine and o-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 5.0×10−6 to 1.0×10−1 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 (KCu2+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. |
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Keywords: | Copper-sensors Copper-selective electrodes Schiff Base |
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