Effect of Soil Parameters on the Kinetics of the Displacement of Fe from FeEDDHA Chelates by Cu

W.D.C. Schenkeveld, A.M. Reichwein, E.J.M. Temminghoff, W.H. van Riemsdijk

Research output: Contribution to journalArticleAcademicpeer-review

10 Citations (Scopus)

Abstract

In soil application, o,o-FeEDDHA (iron (3+) ethylene diamine-N,N'-bis(2-hydroxy phenyl acetic acid) complex) is the active ingredient of FeEDDHA chelate-based Fe fertilizers. The effectiveness of o,o-FeEDDHA is potentially compromised by the displacement of Fe from FeEDDHA by Cu. The actual impact of Cu competition is codetermined by the kinetics of the displacement reaction. In this study, the influence of soil parameters on the displacement kinetics has been examined in goethite suspensions. The displacement reaction predominantly takes place on the reactive surface rather than in solution. The rate at which the o,o-FeEDDHA concentration declined depended on the available reactive surface area, the Cu loading, and the FeEDDHA loading. Soil factors reducing FeEDDHA adsorption (high ionic strength, humic acid adsorption onto the goethite surface, and monovalent instead of divalent cations in the electrolyte) decreased the displacement rate. For meso o,o-FeEDDHA, the displacement rate equation was derived, which is first order in FeEDDHA loading and half order in Cu loading. For soil conditions, the equation can be simplified to an exponential decay function in meso o,o-FeEDDHA solution concentration.
Original languageEnglish
Pages (from-to)6582-6589
JournalThe Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment, & General Theory
Volume116
Issue number25
DOIs
Publication statusPublished - 2012

Keywords

  • metal-edta complexes
  • donnan model parameters
  • strategy i plants
  • humic substances
  • ion adsorption
  • calcareous soil
  • cucumber plants
  • water interface
  • organic-matter
  • acid o,p-eddha

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