Universitat de Lleida
    • English
    • català
    • español
  • English 
    • English
    • català
    • español
  • Login
Repositori Obert UdL
View Item 
  •   Home
  • Recerca
  • Química
  • Articles publicats (Química)
  • View Item
  •   Home
  • Recerca
  • Química
  • Articles publicats (Química)
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Assessment of trace metal binding kinetics in the resin phase of diffusive gradients in thin films

Thumbnail
View/Open
Postprint (1.013Mb)
Issue date
2012
Author
Levy, Jacqueline L.
Zhang, Hao
Davison, William
Puy Llorens, Jaume
Galceran i Nogués, Josep
Suggested citation
Levy, Jacqueline L.; Zhang, Hao; Davison, William; Puy Llorens, Jaume; Galceran i Nogués, Josep; . (2012) . Assessment of trace metal binding kinetics in the resin phase of diffusive gradients in thin films. Analytica Chimica Acta, 2012, vol. 717, num. 2, p. 143-150. https://doi.org/10.1016/j.aca.2011.12.043.
Impact


Web of Science logo    citations in Web of Science

Scopus logo    citations in Scopus

Google Scholar logo  Google Scholar
Share
Export to Mendeley
Metadata
Show full item record
Abstract
The dynamic technique of diffusive gradients in thin films (DGT), that measures metal speciation in situ, has found wide environmental application. Simple interpretation of the metal accumulation in terms of a solution concentration has assumed that trace metals do not penetrate beyond the surface of the binding layer, but penetration, although theoretically discussed has not yet been directly measured. Multiple binding layers were used to enable analysis of different depths of a DGT binding phase (Chelex-100 or iminodiacetate resins). In simple metal solution (no ligand) at pH 7, metal penetration to the back layer was low and similar for all metals. However, at lower pH up to 42% of an individual metal accumulated in the back resin layer. This was most noticeable for Mn at pH 4 and 5, but Cd and Co were also affected at pH 4. These results were consistent with rate limited binding, particularly for Mn. A kinetic model successfully fitted the data and allowed derivation of a binding rate constant and the mean distance that metals penetrate into a resin gel (λM). Only for Mn, Co and Cd were experimentally derived λM values greater than the diameter of a Chelex-100 resin bead. For most situations, then, the penetration into the binding layer is negligible and binding of trace metal ions can be regarded as instantaneous, validating the simple use and interpretation of DGT. For weakly binding metals at low pH the slower binding allows penetration, which may affect the DGT measurement.
URI
http://hdl.handle.net/10459.1/48938
DOI
https://doi.org/10.1016/j.aca.2011.12.043
Is part of
Analytica Chimica Acta, 2012, vol. 717, num. 2, p. 143-150
European research projects
Collections
  • Articles publicats (Química) [294]

Contact Us | Send Feedback | Legal Notice
© 2022 BiD. Universitat de Lleida
Metadata subjected to 
 

 

Browse

All of the repositoryCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

Statistics

View Usage Statistics

D'interès

Política institucional d'accés obertDiposita les teves publicacionsDiposita dades de recercaSuport a la recerca

Contact Us | Send Feedback | Legal Notice
© 2022 BiD. Universitat de Lleida
Metadata subjected to