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An Electrochemical Study of the Interactions Between Trace Metals and Humic Substances in Freshwaters by Anodic Stripping Voltammetry with a Thin Mercury Film Rotating Disk Electrode
Author(s) -
Murimboh Catherine A.,
Deng Jianfu,
Murimboh John,
Guthrie Jeffrey W.,
Chakrabarti Chuni L.,
Lean David R. S.
Publication year - 2005
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200403329
Subject(s) - anodic stripping voltammetry , humic acid , chemistry , inorganic chemistry , voltammetry , metal ions in aqueous solution , mercury (programming language) , metal , electrochemistry , ionic bonding , chloride , polarography , cyclic voltammetry , electrode , ion , organic chemistry , fertilizer , computer science , programming language
An improved theoretical approach to Anodic Stripping Voltammetry with a Thin Mercury Film Rotating Disk Electrode for elucidating the nature of the interactions of Pb(II), Cd(II) and Zn(II) with humic substances in model solutions of Laurentian fulvic acid, and of Pb(II), Cd(II), Zn(II) and Cu(II) in freshwaters, is presented. Conditional stability constants of Pb(II), Cd(II) and Zn(II) complexes decreased with the ionic potential ( z 2 / r ) and increased with softness of the metal ion, indicating strong affinity of soft, polarizable donor ligands on humic substances for softer metal ions, resulting in an appreciable covalent character in electrostatic bonding between the metals and humic substances.