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Metal contaminant fluxes across the sediment water interface

Journal article
Authors Paul Frogner-Kockum
Peter Göransson
Henrik Åslund
Märta Ländell
Rodney Stevens
Anders Tengberg
Gunnel Göransson
Yvonne Ohlsson
Published in Marine Pollution Bulletin
Volume 111
Issue 1-2
Pages 321-329
ISSN 0025-326X
Publication year 2016
Published at Department of Earth Sciences
Department of Chemistry and Molecular Biology
Pages 321-329
Language en
Links http://dx.doi.org/10.1016/j.marpol...
Keywords sediment, geochemistry, metal pollution, diagenesis, diffusion
Subject categories Heavy metals and other metals, Geochemistry, Other Earth and Related Environmental Sciences

Abstract

To date,most estimates of contaminant fluxes across the sediment/water interface in risk assessments have been done using diffusive flux models. However, the reliability of these is limited as the overall flux from the sediment may have contributions caused by advection and bioturbation. We found through a comparison of modelled fluxes versus measured fluxes, that the methods Benthic Flux Chamber and surface leaching tests in a risk assessment context showed similar magnitude while calculated fluxes deviated at least by a factor of 100 from measured fluxes. This may be explained by the flux contribution in connection with bioturbation. The chambermeasured fluxes of copper were low compared to those of zinc and cobalt, but this is consistent with leaching tests that indicated copper to be more strongly bound. Risk assessments based on total concentrations may be misleading.

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