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Electroanalytical Determination of Copper(II) Ions Using a Polymer Membrane Sensor
Oguz Ozbek,Meliha Burcu Gurdere,Caglar Berkel,Omer Isildak The Korean Electrochemical Society 2023 Journal of electrochemical science and technology Vol.14 No.1
In this study, a new potentiometric sensor selective to copper(II) ions was developed and characterized. The developed sensor has a polymeric membrane and contains 4.0% electroactive material (ionophore), 33.0% poly(vinyl chloride) (PVC), 63.0% bis(2-ethylhexyl)sebacate (BEHS) and 1.0% potassium tetrakis(p-chlorophenyl)borate (KTpClPB). This novel copper(II)-selective sensor exhibits a Nernstian response over a wide concentration range from 1.0×10<sup>-6</sup> to 1.0×10<sup>-1</sup> mol L<sup>-1</sup> with a slope of 29.6 (±1.2) mV decade<sup>-1</sup>, and a lower detection limit of 8.75×10-7 mol L<sup>-1</sup>. The sensor, which was produced economically by synthesizing the ionophore in the laboratory, has a good selectivity and repeatability, fast response time and stable potentiometric behaviour. The potential response of the sensor remains unaffected of pH in the range of 5.0-10.0. Based on the analytical applications of the sensor, we showed that it can be used as an indicator electrode in the quantification of Cu<sup>2+</sup> ions by potentiometric titration against EDTA, and can also be successfully utilized for the determination of copper(II) ions in different real samples.