A copper-selective electrode based on bis(acetylacetone)propylenediimine

The potentiometric response characteristics of Cu2+-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 Cu2+ 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 Cu2+ within the concentration range 1.0 x 10(-5) to 1.0 x 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. (c) 2005 Elsevier B.V. All rights reserved.