Voltammetric studies of lead (ll), cadmium(ll), copper(ll) and chromium(lll) ions in the presence of selected n-heterocyclic compound

Voltammetry behaviours of lead(II), cadmium(II), copper(II) and chromium(III) ions in the presence of ligands with nitrogen bearing group, such as picolinic acid (pyridine-2-carboxylic acid or PA), nicotinic acid (pyridine-3-carboxylic acid or NA) and pyridine-2,4-dicarboxylic (2,4-PDCA) acid were b...

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Main Author:	Rahman, Nurul Hudah
Format:	Thesis
Language:	English English
Published:	2011
Subjects:	Voltammetry Heterocyclic compounds Cadmium
Online Access:	http://psasir.upm.edu.my/id/eprint/25739/1/FS%202011%20105R.pdf
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spelling	my-upm-ir.257392022-01-26T05:07:13Z Voltammetric studies of lead (ll), cadmium(ll), copper(ll) and chromium(lll) ions in the presence of selected n-heterocyclic compound 2011-11 Rahman, Nurul Hudah Voltammetry behaviours of lead(II), cadmium(II), copper(II) and chromium(III) ions in the presence of ligands with nitrogen bearing group, such as picolinic acid (pyridine-2-carboxylic acid or PA), nicotinic acid (pyridine-3-carboxylic acid or NA) and pyridine-2,4-dicarboxylic (2,4-PDCA) acid were being studied using hanging dropping mercury electrode (HDME) or platinum electrode as working electrode; Ag/AgCl (3 M NaCl) as reference electrode and platinum wire as counter electrode. Enhancement of the current response using voltammetry technique due to adsorption of electroactive species was investigated. Nicotinic acid has been found to cause enhanced peak current for metal ions such as Pb(II) andCd (II) by about 4.9 folds and 1.6 folds, respectively at a mercury electrode. While, picolinic acid has been found to cause current enhancement of reoxidation Cu(II) by about 1.2 folds using mercury electrode. By using platinum electrode, in the presence of 2,4-PDCA, current enhancement was observed by about 9.6 fold in reduction of Cr(III) ions. By optimizing condition the scan rate study for Pb(II), Cd(II) Cu(II) and Cr(III) were 0.6, 0.4, 0.6 and 0.66 respectively under optimum pH. Moreover, the detection limit were 3.55μM for Pb, 1.34μM for Cd, 2.5μM for Cu and 82.4μM for Cr with the sensitivity of cyclic voltammetry is accompanied by good reproducibility. Furthermore, based on the result obtained from double potential step chronocoulometry the diffusion coefficient of Pb-NA, Cd-NA, Cu-PA and Cr(III)-2,4-PDCA complex species are 7.32 x 10-6, 7.08 x 10-7, 6.18 x 10-6 and 3.9 x 10-6 cm2/s respectively. Various studies using techniques such as Cyclic Voltammetry (CV), Square Wave Voltammetry (SWV), Chronocoulometry (CC) and Chronoamperometry (CA) demonstrated that this enhancement effect was due to the adsorption of metal-ligand complexes on the electrode surface. Thus, this procedure was successfully applied to the simultaneous determination of metal ions (Pb and Cd) in some waste water. Voltammetry Heterocyclic compounds Cadmium 2011-11 Thesis http://psasir.upm.edu.my/id/eprint/25739/ http://psasir.upm.edu.my/id/eprint/25739/1/FS%202011%20105R.pdf application/pdf en public masters Universiti Putra Malaysia Voltammetry Heterocyclic compounds Cadmium Faculty of Science English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
topic	Voltammetry Heterocyclic compounds Cadmium
spellingShingle	Voltammetry Heterocyclic compounds Cadmium Rahman, Nurul Hudah Voltammetric studies of lead (ll), cadmium(ll), copper(ll) and chromium(lll) ions in the presence of selected n-heterocyclic compound
description	Voltammetry behaviours of lead(II), cadmium(II), copper(II) and chromium(III) ions in the presence of ligands with nitrogen bearing group, such as picolinic acid (pyridine-2-carboxylic acid or PA), nicotinic acid (pyridine-3-carboxylic acid or NA) and pyridine-2,4-dicarboxylic (2,4-PDCA) acid were being studied using hanging dropping mercury electrode (HDME) or platinum electrode as working electrode; Ag/AgCl (3 M NaCl) as reference electrode and platinum wire as counter electrode. Enhancement of the current response using voltammetry technique due to adsorption of electroactive species was investigated. Nicotinic acid has been found to cause enhanced peak current for metal ions such as Pb(II) andCd (II) by about 4.9 folds and 1.6 folds, respectively at a mercury electrode. While, picolinic acid has been found to cause current enhancement of reoxidation Cu(II) by about 1.2 folds using mercury electrode. By using platinum electrode, in the presence of 2,4-PDCA, current enhancement was observed by about 9.6 fold in reduction of Cr(III) ions. By optimizing condition the scan rate study for Pb(II), Cd(II) Cu(II) and Cr(III) were 0.6, 0.4, 0.6 and 0.66 respectively under optimum pH. Moreover, the detection limit were 3.55μM for Pb, 1.34μM for Cd, 2.5μM for Cu and 82.4μM for Cr with the sensitivity of cyclic voltammetry is accompanied by good reproducibility. Furthermore, based on the result obtained from double potential step chronocoulometry the diffusion coefficient of Pb-NA, Cd-NA, Cu-PA and Cr(III)-2,4-PDCA complex species are 7.32 x 10-6, 7.08 x 10-7, 6.18 x 10-6 and 3.9 x 10-6 cm2/s respectively. Various studies using techniques such as Cyclic Voltammetry (CV), Square Wave Voltammetry (SWV), Chronocoulometry (CC) and Chronoamperometry (CA) demonstrated that this enhancement effect was due to the adsorption of metal-ligand complexes on the electrode surface. Thus, this procedure was successfully applied to the simultaneous determination of metal ions (Pb and Cd) in some waste water.
format	Thesis
qualification_level	Master's degree
author	Rahman, Nurul Hudah
author_facet	Rahman, Nurul Hudah
author_sort	Rahman, Nurul Hudah
title	Voltammetric studies of lead (ll), cadmium(ll), copper(ll) and chromium(lll) ions in the presence of selected n-heterocyclic compound
title_short	Voltammetric studies of lead (ll), cadmium(ll), copper(ll) and chromium(lll) ions in the presence of selected n-heterocyclic compound
title_full	Voltammetric studies of lead (ll), cadmium(ll), copper(ll) and chromium(lll) ions in the presence of selected n-heterocyclic compound
title_fullStr	Voltammetric studies of lead (ll), cadmium(ll), copper(ll) and chromium(lll) ions in the presence of selected n-heterocyclic compound
title_full_unstemmed	Voltammetric studies of lead (ll), cadmium(ll), copper(ll) and chromium(lll) ions in the presence of selected n-heterocyclic compound
title_sort	voltammetric studies of lead (ll), cadmium(ll), copper(ll) and chromium(lll) ions in the presence of selected n-heterocyclic compound
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Science
publishDate	2011
url	http://psasir.upm.edu.my/id/eprint/25739/1/FS%202011%20105R.pdf
_version_	1747811529473916928

Voltammetric studies of lead (ll), cadmium(ll), copper(ll) and chromium(lll) ions in the presence of selected n-heterocyclic compound

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