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|Title:||Synthesis and structural characterization of new macrocyclic ester. study as an immobilization agent for determination of lead by anodic stripping voltammetry|
|Authors:||Torres, Juan F.|
Anodic stripping voltammetry
|Publisher:||International Journal of Electrochemical Science|
|Citation:||Torres, J. F., Reiber, A., Macías, M., García-Beltran, O., Nagles, E., & Hurtado, J. (2017). Synthesis and structural characterization of new macrocyclic ester. study as an immobilization agent for determination of lead by anodic stripping voltammetry. International Journal of Electrochemical Science, 12(4), 3109–3119.|
|Abstract:||New macrocyclic ester (L) was yielded through reaction of catechol with isophthaloylchloride and isolated as white solid, air stable at room temperature. L was characterized by melting point, mass spectra, FTIR and NMR ( 1 H, 13 C) spectroscopy. The molecular structure was determined by single-crystal X-ray diffraction. The macrocyclic compound was evaluated to determine ultra-trace concentrations of Pb (II) by anodic stripping voltammetry in the presence of Cd(II). The method is based on the formation of a complex between lead and the macrocyclic ester, immobilized on a vitreous carbon electrode, allowing the oxidation of lead by voltammetric scan, using square wave modulation method. Anodic peak current was observed at -0.20 V for Pb(II). Under the best experimental conditions (pH 4.0; L concentration 10.0 mmol L -1 ; accumulative potential (Eacc) -0.8 V and accumulative time (tacc) of 60 s) anodic peak current was proportional to the Pb (II) concentration up to 80.0 μg L -1 , with a detection limit (3σ) of 0.33 μg L -1 . The proposed method was validated by determining Pb(II) in model solution with ultra-pure water with satisfactory results.|
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