Abstract
The potentiometric response characteristics of Cu 2+-selective electrodes based on bis(acetylacetone)propylenediimine ( I) combined with anion localizing agent (sodium tetraphenyl borate (NaTPB)) and solvent mediators (dibutyl butyl phosphonate (DBBP), tri- n-butyl phosphate (TBP) and chloronaphthalene (CN)) were investigated. The best results for Cu 2+ sensing was obtained for the electrode membrane containing PVC, I, DBBP and NaTPB in composition 5:100:200:6 ( I:PVC:DBBP:NaTPB) (w/w; mg), where the electrode had a Nernstian response (30.0 mV/decade) to Cu 2+ within the concentration range 1.0 × 10 −5 to 1.0 × 10 −1 M and detection limit of 0.5 ppm. The operational pH range of the electrode was 3.3–7.0. Selectivity characteristic of the proposed electrode was also assessed by calculating K A , B Pot using fixed interference method matched potential method. The sensor has been successfully used in the potentiometric titration of copper ions with EDTA.
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