An optode sensor array for long-term in situ oxygen measurements in soil and sediment

Rickelt, LF; Askaer, L; Walpersdorf, E; Elberling, B; Glud, RN; Kühl, M

An optode sensor array for long-term in situ oxygen measurements in soil and sediment

Rickelt, LF Askaer, L Walpersdorf, E Elberling, B Glud, RN Kühl, M

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Publication Type:: Journal Article
Citation:: Journal of Environmental Quality, 2013, 42 (4), pp. 1267 - 1273
Issue Date:: 2013-08-20

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Field	Value	Language
dc.contributor.author	Rickelt, LF	en_US
dc.contributor.author	Askaer, L	en_US
dc.contributor.author	Walpersdorf, E	en_US
dc.contributor.author	Elberling, B	en_US
dc.contributor.author	Glud, RN	en_US
dc.contributor.author	Kühl, M https://orcid.org/0000-0002-1792-4790	en_US
dc.date.issued	2013-08-20	en_US
dc.identifier.citation	Journal of Environmental Quality, 2013, 42 (4), pp. 1267 - 1273	en_US
dc.identifier.issn	0047-2425	en_US
dc.identifier.uri	http://hdl.handle.net/10453/27868
dc.description.abstract	Long-term measurements of molecular oxygen (O2) dynamics in wetlands are highly relevant for understanding the effects of water level changes on net greenhouse gas budgets in these ecosystems. However, such measurements have been limited due to a lack of suitable measuring equipment. We constructed an O2 optode sensor array for long-term in situ measurements in soil and sediment. The new device consists of a 1.3-m-long, cylindrical, spear-shaped rod equipped with 10 sensor spots along the shaft. Each spot contains a thermocouple fixed with a robust fiberoptic O2 optode made by immobilizing a layer of Pt(II) meso-tetra(pentafluorophenyl) porphine in polystyrene at the end of a 2-mm polymethyl methacrylate plastic fiber. Temperature and O2 optode readings are collected continuously by a data logger and a multichannel fiberoptic O2 meter. The construction and measuring characteristics of the sensor array system are presented along with a novel approach for temperature compensation of O2 optodes. During in situ application over several months in a peat bog, we used the new device to document pronounced variations in O2 distribution after marked shifts in water level. The measurements showed anoxic conditions below the water level but also diel variations in O2 concentrations in the upper layer presumably due to rhizospheric oxidation by the main vegetation Phalaris arundinacea. The new field instrument thus enables new and more detailed insights to the in situ O2 dynamics in wetlands. © American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.	en_US
dc.relation.ispartof	Journal of Environmental Quality	en_US
dc.relation.isbasedon	10.2134/jeq2012.0334	en_US
dc.subject.classification	Agronomy & Agriculture	en_US
dc.subject.mesh	Oxygen	en_US
dc.subject.mesh	Water	en_US
dc.subject.mesh	Soil	en_US
dc.subject.mesh	Ecosystem	en_US
dc.subject.mesh	Wetlands	en_US
dc.title	An optode sensor array for long-term in situ oxygen measurements in soil and sediment	en_US
dc.type	Journal Article
utslib.citation.volume	4	en_US
utslib.citation.volume	42	en_US
utslib.for	0501 Ecological Applications	en_US
utslib.for	04 Earth Sciences	en_US
utslib.for	05 Environmental Sciences	en_US
utslib.for	06 Biological Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Strength - C3 - Climate Change Cluster
utslib.copyright.status	closed_access
pubs.issue	4	en_US
pubs.publication-status	Published	en_US
pubs.volume	42	en_US

Abstract:

Long-term measurements of molecular oxygen (O2) dynamics in wetlands are highly relevant for understanding the effects of water level changes on net greenhouse gas budgets in these ecosystems. However, such measurements have been limited due to a lack of suitable measuring equipment. We constructed an O2 optode sensor array for long-term in situ measurements in soil and sediment. The new device consists of a 1.3-m-long, cylindrical, spear-shaped rod equipped with 10 sensor spots along the shaft. Each spot contains a thermocouple fixed with a robust fiberoptic O2 optode made by immobilizing a layer of Pt(II) meso-tetra(pentafluorophenyl) porphine in polystyrene at the end of a 2-mm polymethyl methacrylate plastic fiber. Temperature and O2 optode readings are collected continuously by a data logger and a multichannel fiberoptic O2 meter. The construction and measuring characteristics of the sensor array system are presented along with a novel approach for temperature compensation of O2 optodes. During in situ application over several months in a peat bog, we used the new device to document pronounced variations in O2 distribution after marked shifts in water level. The measurements showed anoxic conditions below the water level but also diel variations in O2 concentrations in the upper layer presumably due to rhizospheric oxidation by the main vegetation Phalaris arundinacea. The new field instrument thus enables new and more detailed insights to the in situ O2 dynamics in wetlands. © American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.

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http://hdl.handle.net/10453/27868