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Modelling lead(II) sorption to ferrihydrite and soil organic matter
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering (moved 20130630), Environmental Geochemistry and Ecotechnology.ORCID iD: 0000-0001-8771-7941
Swedish University of Agricultural Sciences.
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering (moved 20130630).
Swedish Geotechnical Institute.
2011 (English)In: Environmental Chemistry, ISSN 1448-2517, Vol. 8, no 5, 485-492 p.Article in journal (Refereed) Published
Abstract [en]

Lead(II) adsorption to soil organic matter and iron (hydr)oxides is strong, and may control the geochemical behaviour of this metal. Here, we report the adsorption of Pb(2+) (i) to 2-line ferrihydrite, and (ii) to a mor layer. The results showed that ferrihydrite has heterogeneous Pb(2+) binding. Use of a surface complexation model indicated that similar to 1% of the surface sites adsorbed Pb(2+) more strongly than the remaining 99 %. Although only one surface complexation reaction was used (a bidentate complex of the composition (equivalent to FeOH)(2)Pb(+)), three classes of sites with different affinity for Pb(2+) were needed to simulate Pb(2+) binding correctly over all Pb/Fe ratios analysed. For the mor layer, Pb(2+) sorption was much stronger than current models for organic complexation suggest. The results could be described by the Stockholm Humic Model when the binding heterogeneity was increased, and when it was assumed that 0.2% of the binding sites were specific for Pb. Use of revised model parameters for nine Vietnamese soils suggest that lead(II) binding was more correctly simulated than before. Thus, underestimation of lead(II) sorption to both (hydr) oxide surfaces and organic matter may explain the failure of previous geochemical modelling attempts for lead(II).

Place, publisher, year, edition, pages
CSIRO Publishing, 2011. Vol. 8, no 5, 485-492 p.
Keyword [en]
binding heterogeneity, CD-MUSIC model, 2-line ferrihydrite, mor layer, Stockholm Humic model
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:kth:diva-45605DOI: 10.1071/EN11025ISI: 000295838300005ScopusID: 2-s2.0-80054759381OAI: diva2:453606
Swedish Research Council, 2007-4468

QC 20111103

Available from: 2011-11-03 Created: 2011-10-31 Last updated: 2015-03-24Bibliographically approved

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Gustafsson, Jon PetterEdkymish, Abubaker
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