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Equilibrium models of aluminium and iron complexation with different organic acids in soil solution
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
2000 (English)In: Geoderma, ISSN 0016-7061, E-ISSN 1872-6259, Vol. 94, no 2-4, 201-221 p.Article in journal (Refereed) Published
Abstract [en]

The percentage of Al and Fe bound to identified low molecular weight (LMW) organic acids and phosphate in soil solution was calculated using a chemical equilibrium model. The highest fractions were obtained for the O1 horizon solutions with median values between 38-49% for Al and 18-29% for Fe. Generally the percentage declined in the deeper horizons. Acceptable agreement with experimental values using ultrafiltration (< 1000 D) was found especially for the spring and summer samplings. In the autumn samples, larger deviations between the modelled and ultrafiltered fractions were found. The major part of the remaining Al and Fe in solution was calculated to be bound to undefined organic acids most likely of higher molecular weight. Speciation studies of some individual organic acids are presented. Citric acid proved to be the most important complex former of the LMW acids in the O and E horizons while oxalic acid was dominant in the B horizon solutions. The total level of organic complexation of Al, Fe, Ca and Mg was also studied. It was found that > 85% of the Al and > 95% of the Fe were organically bound. The opposite was seen for Ca and Mg for which > 85% was modelled to occur as inorganic ions. The modelling results support the theory that LMW organic acids contribute to the translocation of Al and Fe in the podzolization process.

Place, publisher, year, edition, pages
2000. Vol. 94, no 2-4, 201-221 p.
Keyword [en]
complex organic acids soil
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:miun:diva-2387DOI: 10.1016/S0016-7061(98)00139-6ISI: 000085352500008Scopus ID: 2-s2.0-0033983946Local ID: 2044OAI: oai:DiVA.org:miun-2387DiVA: diva2:27419
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2016-10-11Bibliographically approved

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van Hees, P. A. W.Lundström, Ulla
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CiteExportLink to record
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Cite
Citation style
  • apa
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