Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.12313/522
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.
Reiber, Andreas
Macías, Mario
García-Beltrán, Olimpo
Nagles, Edgar
Hurtado, John
Keywords: Macrocyclic ester
Modified electrode
Lead
Anodic stripping voltammetry
Issue Date: 12-Mar-2017
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.
URI: http://www.electrochemsci.org/papers/vol12/120403109.pdf
ISSN: 1452-3981
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