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Scientific article
English

Roles of Dynamic Metal Speciation and Membrane Permeability in Metal Flux through Lipophilic Membranes: General Theory and Experimental Validation with Nonlabile Complexes

Published inLangmuir, vol. 23, no. 9, p. 5216-5226
Publication date2007-04-24
First online date2007-03-29
Abstract

The study of the role of dynamic metal speciation in lipophilic membrane permeability in aqueous solution requires accurate interpretation of experimental data. To meet this goal, a general theory is derived for describing 1:1 metal complex flux, under steady-state and ligand excess conditions, through a permeation liquid membrane (PLM). The theory is applicable to fluxes through any lipophilic membrane. From this theory, fluxes in the three rate-limiting conditions for metal transport are readily derived, corresponding, namely, to (i) diffusion in the source solution, (ii) diffusion in the membrane, and (iii) the chemical kinetics of formation/dissociation of the metal complex in the interfacial reaction layer. The theory enables discussion of the reaction layer concept in a more general frame and also provides unambiguous criteria for the definition of an inert metal complex. The theoretical flux equations for fully labile complexes were validated in a previous paper. The general theory for semi- or nonlabile complexes is validated here by studying the flux of Pb(II) through PLMs in contact with solutions of Pb(II)-NTA and Pb(II)-TMDTA at different pHs and flow rates.

eng
Keywords
  • Hydrogen-Ion Concentration
  • Kinetics
  • Lead / chemistry
  • Ligands
  • Lipids / chemistry
  • Membranes, Artificial
  • Models, Chemical
  • Nitrilotriacetic Acid / chemistry
  • Permeability
  • Solutions / chemistry
  • Surface Properties
  • Water / chemistry
Citation (ISO format)
ZHANG, Zeshi, BUFFLE, Jacques, VAN LEEUWEN, Hermanus Paulus. Roles of Dynamic Metal Speciation and Membrane Permeability in Metal Flux through Lipophilic Membranes: General Theory and Experimental Validation with Nonlabile Complexes. In: Langmuir, 2007, vol. 23, n° 9, p. 5216–5226. doi: 10.1021/la063568f
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ISSN of the journal0743-7463
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