Potentiometric determination of copper(II) ions based on a porphyrin derivative

• Published in: Journal of the Chinese Chemical Society (Taipei) 2022-07, Vol.69 (7), p.1060-1069
• Main Authors: Özbek, Oguz, Isildak, Ömer
• Format: Article
• Language: English
• Subjects: Copper; copper(II); Ion concentration; Porphyrins; potentiometry; PVC membrane; Response time; Selectivity; sensor; Titration
• ISSN: 0009-4536; 2192-6549
• DOI: 10.1002/jccs.202200168

A novel poly(vinyl chloride; PVC) membrane‐based Cu(II)–selective sensor has been developed using synthesized 5,10,15,20‐tetrakis(4‐methoxycarbonylphenyl)porphyrin as an ionophore. The Cu(II)–selective sensor exhibits a Nernstian response for Cu(II) ion over a wide concentration range of 1.0 × 10−5 to 1.0 × 10−1 mol L−1 with the slope of 27.0 ± 2.5 mV/decade, and a lower limit of detection of 1.88 × 10−6 mol L−1. The novel sensor shows good repeatability and high selectivity for Cu(II) ions over other mono‐, bi‐ and trivalent cations. The sensor potential response remains unaffected by pH in the range of 4.4–10.6 and exhibits a fast response time of less than 10s. Finally the developed Cu(II)–selective sensor has been successfully used as an indicator electrode in the potentiometric titration of Cu2+ against ethylenediaminetetraacetic acid and also in the determination of Cu(II) ion concentration in different water and beverage samples. In this study, a novel potentiometric sensor was developed for the determination of Cu2+ ions. The developed sensor exhibits a linear response over a wide concentration range and has a very low detection limit. In addition, the copper(II)–selective sensor has advantages such as high selectivity, short response time, low cost, good repeatability, and stability.