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Aquatic Geochemistry

, Volume 16, Issue 4, pp 575–585 | Cite as

The Association of Cobalt with Iron and Manganese (Oxyhydr)oxides in Marine Sediment

  • Anthony Stockdale
  • William Davison
  • Hao ZhangEmail author
  • John Hamilton-Taylor
Original Paper

Abstract

Formation and dissolution of authigenic Fe and Mn (oxyhydr)oxides influence cycling of trace metals in oxic/suboxic surface sediments. We used the diffusive gradients in thin films technique (DGT) to estimate the association of cobalt with iron and manganese oxides. We compared Co, Fe and Mn maxima measured by DGT in the pore waters of fresh and aged marine sediment cores and estimated the Co/Fe and Co/Mn ratios in the metal oxides. A Mn maximum was not visible in DGT concentration profiles of freshly collected sediment cores, but after ageing the sediment, we observed a distinct Mn peak, presumably due to broadening of the depth range over which the various electron acceptors occur. Estimated Co/Mn ratios from both experiments are within the range of literature values for marine sediments, but the value from the aged experiment is at the lower end of the range. This is attributed to stimulation of sulphate reduction and precipitation of cobalt sulphides. The good correlation between Co and Fe maxima in the fresh sediments is attributed to the similarity of their reactions with sulphide rather than Co being released during authigenic Fe oxide reduction.

Keywords

DGT Porewater Trace metal Biogeochemical cycling 

Notes

Acknowledgments

A. Stockdale was supported by the UK Natural Environment Research Council (NER/S/A/2005/13679). We thank Debbie Hurst for assistance with the sediment sampling and an anonymous reviewer for helpful comments that improved the manuscript.

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Anthony Stockdale
    • 1
    • 2
  • William Davison
    • 1
  • Hao Zhang
    • 1
    Email author
  • John Hamilton-Taylor
    • 1
  1. 1.Department of Environmental Science, Lancaster Environment Centre (LEC)Lancaster UniversityLancasterUK
  2. 2.Centre for Ecology and HydrologyLancaster Environment CentreLancasterUK

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