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Short-term (24 h) effects of mild and severe hypoxia (20% and 5% dissolved oxygen) on metal partitioning in highly contaminated estuarine sediments

journal contribution
posted on 2023-05-17, 11:44 authored by Banks, J, Donald RossDonald Ross, Keough, MJ
metal (Cd, Cu, Fe, Mn, Pb and Zn) partitioning within metal-contaminated sediments in replicated, undisturbed sediment/water chambers show that even very brief periods of hypoxia may significantly increase the dissolved fraction of these heavy metals within contaminated sediments, increasing their potential for ecological harm. This study used treatments consisting of three DO levels (75%, 20% and 5% saturation) representing ambient conditions, mild hypoxia and severe hypoxia. Although contaminant loads were very high in these sediments, pore-water concentrations were relatively low. Total sediment and dilute acid (1 M HCl) extracted metals were unaffected by low DO treatments but a diffusive gradient in thin-films samplers (DGTs), detected a two-fold increase in pore-water Cd and a five-fold increase in pore-water Cu in surface sediments (0e3 cm depth) under low oxygen conditions.

History

Publication title

Estuarine, Coastal and Shelf Science

Volume

99

Pagination

121-131

ISSN

0272-7714

Department/School

Institute for Marine and Antarctic Studies

Publisher

Academic Press Ltd Elsevier Science Ltd

Place of publication

24-28 Oval Rd, London, England, Nw1 7Dx

Rights statement

Copyright 2012 Elsevier Ltd.

Repository Status

  • Restricted

Socio-economic Objectives

Assessment and management of terrestrial ecosystems

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