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Field assessment of a new membrane-free microelectrode dissolved oxygen sensor for water column profiling

Field assessment of a new membrane-free microelectrode dissolved oxygen sensor for water column profiling
Field assessment of a new membrane-free microelectrode dissolved oxygen sensor for water column profiling
This article reports on the field trials of a membrane-free amperometric microelectrode dissolved oxygen sensor, which were performed during oceanographic cruise D279 of RRS Discovery. The sensor was used to obtain full depth oxygen profiles while mounted on a wire-operated CTD (conductivity, temperature, depth) instrument. A stable performance was achieved by carefully designed electrochemical cleaning conditions of the sensing platinum microdisk cathode. The flow issues inherent to moving probes were resolved by a novel stop-flow cell fitted with a pumping system for sample exchange and flow control. The details of the sensor operation, calibration, and construction, including the flow control system, are described. The sensor response is validated by calibration and by an analytical approach that yields oxygen data directly from the current readings. The accuracy of the microelectrode response is critically assessed using Winkler titrations on bottle samples taken during the relevant sensor deployments. The results lead to the conclusion that due to high accuracy, fast response time, and lack of membrane-related problems the device is particularly suitable for moving probes and high spatial resolution water column oxygen profiling.
mn, aquatic systems, oceanic ctds, electrolyte-solutions, fe, microstructure, voltammetric microelectrode, o-2, sea-floor, copper
1541-5856
180-189
Sosna, Maciej
b089fe7e-6f5b-4e30-a43c-0cde0aa1fac4
Denuault, Guy
5c76e69f-e04e-4be5-83c5-e729887ffd4e
Pascal, Robin W.
3b2e2a38-334f-430f-b110-253a0a835a07
Prien, Ralf D.
aff89537-c421-4935-8614-fc784245371e
Mowlem, Matt
6f633ca2-298f-48ee-a025-ce52dd62124f
Sosna, Maciej
b089fe7e-6f5b-4e30-a43c-0cde0aa1fac4
Denuault, Guy
5c76e69f-e04e-4be5-83c5-e729887ffd4e
Pascal, Robin W.
3b2e2a38-334f-430f-b110-253a0a835a07
Prien, Ralf D.
aff89537-c421-4935-8614-fc784245371e
Mowlem, Matt
6f633ca2-298f-48ee-a025-ce52dd62124f

Sosna, Maciej, Denuault, Guy, Pascal, Robin W., Prien, Ralf D. and Mowlem, Matt (2008) Field assessment of a new membrane-free microelectrode dissolved oxygen sensor for water column profiling. Limnology and Oceanography: Methods, 6, 180-189. (doi:10.4319/lom.2008.6.180).

Record type: Article

Abstract

This article reports on the field trials of a membrane-free amperometric microelectrode dissolved oxygen sensor, which were performed during oceanographic cruise D279 of RRS Discovery. The sensor was used to obtain full depth oxygen profiles while mounted on a wire-operated CTD (conductivity, temperature, depth) instrument. A stable performance was achieved by carefully designed electrochemical cleaning conditions of the sensing platinum microdisk cathode. The flow issues inherent to moving probes were resolved by a novel stop-flow cell fitted with a pumping system for sample exchange and flow control. The details of the sensor operation, calibration, and construction, including the flow control system, are described. The sensor response is validated by calibration and by an analytical approach that yields oxygen data directly from the current readings. The accuracy of the microelectrode response is critically assessed using Winkler titrations on bottle samples taken during the relevant sensor deployments. The results lead to the conclusion that due to high accuracy, fast response time, and lack of membrane-related problems the device is particularly suitable for moving probes and high spatial resolution water column oxygen profiling.

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More information

Published date: April 2008
Keywords: mn, aquatic systems, oceanic ctds, electrolyte-solutions, fe, microstructure, voltammetric microelectrode, o-2, sea-floor, copper

Identifiers

Local EPrints ID: 54506
URI: http://eprints.soton.ac.uk/id/eprint/54506
ISSN: 1541-5856
PURE UUID: 54f46d3e-3193-4c64-980e-cb60f8c5310a
ORCID for Guy Denuault: ORCID iD orcid.org/0000-0002-8630-9492

Catalogue record

Date deposited: 19 Aug 2008
Last modified: 17 Dec 2019 02:01

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