Akademik Veri Yönetim Sistemi
Chemical Papers, cilt.78, sa.15, ss.8245-8260, 2024 (SCI-Expanded)
In this study, a highly selective and sensitive composite electrochemical sensor based on an ion-imprinted polymer (IIP) material is reported for the potentiometric determination of ultra-trace copper (II) ions. The copper (II)-IIP was prepared by using N-methacryloyl-L-histidine chelating monomer and ethylene glycol dimethacrylate cross-linker via bulk polymerization method. The synthesized IIP was used as electroactive material (ionophore) with graphite (G) and paraffin oil (PO) for recognition of copper (II). The sensor composition was optimized for effective recognition of copper (II) by examining ratios of components used in sensor preparation. The sensor with a composition of IIP/G/PO in the ratio 30:50:20 (% w/w) exhibited an ultra-wide linear response in detection of copper (II) ions with a Nernstian slope of 32.8 ± 1.2 mV in the concentration range of 1.0 × 10–8—1.0 × 10–1 mol L−1 (R2 = 0.9978), and a response time of 6 s was achieved with the optimized sensor. The potential response was stable within the pH range from 3.0 to 8.0. The standard deviation of the sensor was below 1.2 mV for 1.0 × 10–2, 1.0 × 10–3, and 1.0 × 10–4 mol L−1 copper (II) solutions. The sensor afforded a highly selective potentiometric response to Cu2+ with respect to Rb+, K+, Li+, Na+, NH4+, Cs+, Ba2+, Co2+, Mg2+, Zn2+, Ni2+, Pb2+, Cr3+, Sr2+, Al3+, and Ca2+ ions. The developed sensor was used as an indicator sensor for the potentiometric titrations of copper (II) with EDTA and successfully applied to the determination of copper (II) in tap water, river water, dam lake water samples, coin samples, and food supplements (multivitamin/multielement).