Potentiometric examination of complexation equilibria of some phenoxyacetic acid derivatives with Cu(II), Cd(II) and Zn(II)

Authors: Masbouh, Fadel; Kabli, Hassan; El Amine, Maria E.; El Jazouli, Habiba; Ichou, Yahya Ait; Albourine, Abdullah

Source: Chemical Speciation and Bioavailability, Volume 18, Number 3, August 2006 , pp. 117-122(6)

Publisher: Science Reviews 2000 Ltd

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Abstract:

The stability constants of binary complexes of 2,4-dichlorophenoxyacetic acid (2,4-D), (4-chloro-2- methylphenoxy)acetic acid (2,4-MCPA) and (4-chloro-2-methylphenoxy) propionic acid (2,4-MCPA) with Cu(II), Cd(II) and Zn(II) have bean calculated at 298 K and at ionic strength μ= 0:1 (NaNO₃). Potentiometric measurements display three hydroxide complexes: MH₋₁A, MH₋₁A₂ and MH₋₁A₂. With regard to the successive complexes, no other system represents this type of complexes under our experimental conditions. The order of capacity of complexation compared to metal for the three ligands is Cu(II)4Zn(II)4Cd(II).

Keywords: binary coordination; cadmium; copper; pesticides; potentiometry; stability constants; zinc

Document Type: Research article

DOI: http://dx.doi.org/10.3184/095422906782146212

Affiliations: 1: Equipe de Chimie de Coordination, Laboratoire des Matériaux et Environnement, Faculté des Sciences, Université Ibnou Zohr, BP 8106, Cité Dakhla, 80000 Agadir, Morocco

Publication date: 2006-08-10

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Chemical Speciation & Bioavailability covers a rapidly expanding area in environmental science.
Research on the interactions between the chemical forms and behaviour of toxic compounds and their subsequent biological uptake, metabolism and ecological fate involves many scientific fields. These studies are often published in discipline-specific journals, leading to inadequate review and information scatter. This situation hinders both the development of an international community of experienced colleagues and the open flow of information and discussion. Additionally, the importance of speciation and bioavailability research to the development of pollution law and control technologies is being increasingly appreciated by environmental regulatory agencies throughout the world.
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Potentiometric examination of complexation equilibria of some phenoxyacetic acid derivatives with Cu(II), Cd(II) and Zn(II)

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