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Effect of the competition of copper and cobalt on the lability of Ni(II)–organic ligand complexes. Part I. In model solutions containing Ni(II) and a well-characterized fulvic acid by R. Mandal; Amina L.R. Sekaly; J. Murimboh; Nouri M. Hassan; C.L. Chakrabarti; M.H. Back; D.C. Grégoire; W.H. Schroeder is a Chemistry article available to read on EtoBox.

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The competitive binding of Cu(II), Co(II) and Ni(II) ions by a well-characterized fulvic acid (FA) in model aqueous solutions has been investigated by employing the competing ligand exchange method (CLEM) with Chelex-100 as the competing ligand. The reaction rate between a metal ion and a ligand is dependent on the rate of exchange of the coordinated water, which varies greatly for the above metals. Fulvic acid is a polyfunctional, polyelectrolytical, physically-heterogeneous, organic complexant having binding sites that can be roughly classi®ed into two categories: minor ($1±10%), strong sites, and major ($99±90%), weak sites. The strong binding sites are ®rst occupied, and after all the strong binding sites are occupied, the weak binding sites are occupied. Experiments have been done using model aqueous solutions containing various concentrations of Cu, Co and Ni, and the above well-characterized FA. Graphite furnace atomic absorption spectrometry and inductively-coupled plasma mass spectrometry were employed to monitor the rate of uptake of the metals by Chelex-100. The above metals, in the metals/FA mole ratios used in this study, have been found to compete with one another for

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Author

R. Mandal; Amina L.R. Sekaly; J. Murimboh; Nouri M. Hassan; C.L. Chakrabarti; M.H. Back; D.C. Grégoire; W.H. Schroeder

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0003-2670)

Published

1999

Language

EN

Field

Chemistry (Physical Sciences)