Coupled effects of hydrodynamics and biogeochemistry on Zn mobility and speciation in highly contaminated sediments

Minwei Xie, Brooke A. Jarrett, Cécile Da Silva-Cadoux, Kyle J. Fetters, G. Allen Burton, Jean François Gaillard*, Aaron I. Packman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


Porewater transport and diagenetic reactions strongly regulate the mobility of metals in sediments. We executed a series of laboratory experiments in Gust chamber mesocosms to study the effects of hydrodynamics and biogeochemical transformations on the mobility and speciation of Zn in contaminated sediments from Lake DePue, IL. X-ray absorption spectroscopy (XAS) indicated that the oxidation of surficial sediments promoted the formation of more mobile Zn species. Bulk chemical measurements of porewater, overlying water, and sediment also suggested that this process liberated aqueous metals to porewater and facilitated Zn efflux to the overlying water. In addition, sediment resuspension events increased the release of aqueous metals to both surficial porewater and the overlying water column. XAS analysis indicated that resuspension increased dissolution of Zn-sequestering mineral phases. These results show that both steady slow porewater transport and rapid episodic resuspension are important to the release of metal from fine-grained, low-permeability contaminated sediments. Thus, information on metals speciation and mobility under time-varying overlying flow conditions is essential to understanding the long-term behavior of metals in contaminated sediments.

Original languageEnglish (US)
Pages (from-to)5346-5353
Number of pages8
JournalEnvironmental Science and Technology
Issue number9
StatePublished - May 5 2015

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry


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