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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

Citation

Banks, J and Ross, DJ and Keough, MJ, Short-term (24 h) effects of mild and severe hypoxia (20% and 5% dissolved oxygen) on metal partitioning in highly contaminated estuarine sediments, Estuarine, Coastal and Shelf Science, 99 pp. 121-131. ISSN 0272-7714 (2012) [Refereed Article]

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Copyright Statement

Copyright 2012 Elsevier Ltd.

DOI: doi:10.1016/j.ecss.2011.12.025

Abstract

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.

Item Details

Item Type:Refereed Article
Keywords:metal pollution, hypoxia, DGT, estuarine sediment
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Aquaculture and fisheries stock assessment
Objective Division:Environmental Management
Objective Group:Terrestrial systems and management
Objective Field:Assessment and management of terrestrial ecosystems
UTAS Author:Ross, DJ (Associate Professor Jeff Ross)
ID Code:77735
Year Published:2012
Web of Science® Times Cited:11
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2012-05-22
Last Modified:2014-11-06
Downloads:0

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