Chemically modified copper potentiometric sensors based on curcumin and amino acid
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ORIGINAL PAPER
Chemically modified copper potentiometric sensors based on curcumin and amino acid Eman Yossri Frag1 · Gehad G. Mohamed1 · Marwa Saad1 Received: 15 May 2020 / Accepted: 29 August 2020 © Iranian Chemical Society 2020
Abstract Modified carbon paste electrodes based on amino acid (l-ornithine) or curcumin (turmeric) as ionophores and o-nitrophenyl octyl ether (o-NPOE) as solvent mediator were prepared and investigated as Cu(II) ion-selective electrodes. The reaction mechanism between Cu(II) and l-ornithine (electrode I) or turmeric (electrode II) ionophores at the sensor surface were studied using energy-dispersive X-ray analysis (EDX), scanning electron microscopy (SEM) and IR spectra measurement. These electrodes showed potentiometric response with a divalent cationic Nernstian slopes of 29.0 ± 0.04 and 30.4 ± 0.01 mV decade−1, within a working concentration ranging from 1.0 × 10−6 to 1.0 × 10−2 mol L−1 with a short response time of 10 and 7 s for electrodes I and II, respectively. The electrodes exhibited constant potentiometric response in pH range 2-6 and 3-6 for electrodes I and II, respectively. The proposed sensors exhibited adequate sensitivity to Cu(II) ions over the other metal ions. The sensors were used for estimation of Cu(II) ion concentration in real water samples with satisfactory and good reproducibility results. Keywords Modified carbon paste electrodes · Cu(II) · Indian spices · Amino acid · IR · SEM · Water samples
Introduction Copper has a catalytic effect on auto-oxidation, which may lead to undesirable oxidation in nutritional or other samples. The metals which are present in fats and oils may be due to a corrosion of processing equipment (Fe, Ni), hardening (Ni, Cu) and the bleaching (Fe), or natural origin. Although copper (II) ions are very important for different biological processes, their levels in some cases are signals of a trouble or malady in numerous environments or living systems. Accumulation of copper in the liver organism is a distinctive of Wilson’s disease, which leads to psychiatric and neurological disordered. As a result, the essential element in human diet is copper, although intake of big quantities may be toxic. Copper compounds soluble in drinking water show the biggest menace to humans. Therefore, the determination of copper at low levels is of special interest in both environmental monitoring and process monitoring.
* Eman Yossri Frag [email protected] 1
Chemistry Department, Faculty of Science, Cairo University, 12613 Giza, Egypt
Numerous methods have been applied to detect copper ion including atomic absorption spectrometry and the solidphase extraction of copper (II) using modified octadecyl silica membrane [1], dispersive liquid–liquid microextraction [2], spectrophotometry [3], high-performance liquid chromatography [4], adsorptive stripping voltammetry [5] and anodic stripping voltammetry [6]. Electroanalytical analysis has found a wide range of applications in many fields, such as environmental monitoring, industrial quality cont
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