High spatial resolution measurement of oxygen consumption rates in permeable sediments

Polerecky, Lubos, Franke, Ulrich, Werner, Ursula, Grunwald, Bjorn and de Beer, Dirk (2005) High spatial resolution measurement of oxygen consumption rates in permeable sediments. Limnology and Oceanography: Methods, 3 2005: 75-85. doi:10.4319/lom.2005.3.75

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Author Polerecky, Lubos
Franke, Ulrich
Werner, Ursula
Grunwald, Bjorn
de Beer, Dirk
Title High spatial resolution measurement of oxygen consumption rates in permeable sediments
Journal name Limnology and Oceanography: Methods   Check publisher's open access policy
ISSN 1541-5856
Publication date 2005-02-07
Year available 2005
Sub-type Article (original research)
DOI 10.4319/lom.2005.3.75
Open Access Status File (Publisher version)
Volume 3
Issue 2005
Start page 75
End page 85
Total pages 11
Place of publication Waco, TX, United States
Publisher American Society of Limnology and Oceanography
Language eng
Subject 060205 Marine and Estuarine Ecology (incl. Marine Ichthyology)
Abstract A method is presented for the measurement of depth profiles of volumetric oxygen consumption rates in permeable sediments with high spatial resolution. When combined with in situ oxygen microprofiles measured by microsensors, areal rates of aerobic respiration in sediments can be calculated. The method is useful for characterizing sediments exposed to highly dynamic advective water exchange, such as intertidal sandy sediments. The method is based on percolating the sediment in a sampling core with aerated water and monitoring oxygen in the sediment using either an oxygen microelectrode or a planar oxygen optode. The oxygen consumption rates are determined using three approaches: (1) as the initial rate of oxygen decrease measured at discrete points after the percolation is stopped, (2) from oxygen microprofiles measured sequentially after the percolation is stopped, and (3) as a derivative of steady-state oxygen microprofiles measured during a constant percolation of the sediment. The spatial resolution of a typical 3 to 4 cm profile within a measurement time of 1 to 2 h is better with planar optodes (˜0.3 mm) then with microelectrodes (2 to 5 mm), whereas the precision of oxygen consumption rate measurements at individual points is similar (0.1 to 0.5 µmol L–1 min–1) for both sensing methods. The method is consistent with the established methods (interfacial gradients combined with Fick’s law of diffusion, benthic-chambers), when tested on the same sediment sample under identical, diffusion-controlled conditions.
Keyword permeable sediments
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Advanced Water Management Centre Publications
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Created: Tue, 03 Feb 2009, 15:57:25 EST by Ms Karen Naughton on behalf of Advanced Water Management Centre