The multi fiber optode (MuFO): A novel system for simultaneous analysis of multiple fiber optic oxygen sensors

Fischer, Jan; Koop-Jakobsen, Ketil

doi:10.1016/j.snb.2012.04.034

Cited by 16 publications

(27 citation statements)

References 22 publications

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“…In this study, we monitored the 10 optodes mounted in the spear with a 10‐channel fiberoptic O 2 meter. Another possibility for using multiple sensors is to image the end of a fiber bundle with the O 2 –sensing ends distributed in the sample (Fischer and Koop‐Jakobsen, 2012); these authors used an expensive life‐time imaging system for sensor read‐out. Both the bundle approach and the spear approach presented here can be combined with ratiometric O 2 sensor readout using the inexpensive camera system of Larsen et al (2011), and such work is in progress (Larsen et al, unpublished).…”

Section: Resultsmentioning

confidence: 99%

“…Optical oxygen sensors (i.e., O 2 optodes) are well suited for environmental monitoring due to their mechanical robustness and good long‐term stability of measuring signals (Kühl, 2005; Holst et al, 2000). Fiberoptic O 2 sensor arrays have previously been described for microscale measurements of O 2 distribution (Holst et al, 1997; Glud et al, 1999; Fischer and Koop‐Jakobsen, 2012) and for measurements in soil and sediment (Hecht and Kölling, 2001; Kölling et al, 2002). These systems did not include temperature compensation.…”

Section: Methodsmentioning

confidence: 99%

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An Optode Sensor Array for Long-Term In Situ Oxygen Measurements in Soil and Sediment

et al. 2013

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Long-term measurements of molecular oxygen (O) 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 O 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 O 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 O optode readings are collected continuously by a data logger and a multichannel fiberoptic O meter. The construction and measuring characteristics of the sensor array system are presented along with a novel approach for temperature compensation of O optodes. During in situ application over several months in a peat bog, we used the new device to document pronounced variations in O distribution after marked shifts in water level. The measurements showed anoxic conditions below the water level but also diel variations in O concentrations in the upper layer presumably due to rhizospheric oxidation by the main vegetation The new field instrument thus enables new and more detailed insights to the in situ O dynamics in wetlands.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

An Optode Sensor Array for Long-Term In Situ Oxygen Measurements in Soil and Sediment

et al. 2013

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“…A further, recent adaptation of planar optodes is the use of a camera as a readout device for fiber optic cables [242,243]. Using a single camera, the ends of up to 100 freely positionable fiber optic cables can be read out simultaneously.…”

Section: Methods Developmentmentioning

confidence: 99%

“…Using a single camera, the ends of up to 100 freely positionable fiber optic cables can be read out simultaneously. The system presented by Fischer and Koop-Jakobsen [242] was based on lifetime O 2 measurements, but a ratiometric imaging approach could also be applied for e.g. O 2 , pH and pCO 2 measurements.…”

Section: Methods Developmentmentioning

confidence: 99%

Two decades of chemical imaging of solutes in sediments and soils – a review

Santner

Larsen

Kreuzeder

et al. 2015

Analytica Chimica Acta

162

130

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The increasing appreciation of the small-scale (sub-mm) heterogeneity of biogeochemical processes in sediments, wetlands and soils has led to the development of several methods for high-resolution two-dimensional imaging of solute distribution in porewaters. Over the past decades, localised sampling of solutes (diffusive equilibration in thin films, diffusive gradients in thin films) followed by planar luminescent sensors (planar optodes) have been used as analytical tools for studies on solute distribution and dynamics. These approaches have provided new conceptual and quantitative understanding of biogeochemical processes regulating the distribution of key elements and solutes including O2, CO2, pH, redox conditions as well as nutrient and contaminant ion species in structurally complex soils and sediments. Recently these methods have been applied in parallel or integrated as so-called sandwich sensors for multianalyte measurements. Here we review the capabilities and limitations of the chemical imaging methods that are currently at hand, using a number of case studies, and provide an outlook on potential future developments for two-dimensional solute imaging in soils and sediments.

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“…1,2 Therefore, oxygen is the most sought-aer chemical prole in heterogeneous ecosystems as well as in unstirred technological reactors. [12][13][14][15][16][17][18] Soil gas sampling techniques are impractical in moist or ne grained soil. 7,8 Oxygen proling in soil poses a different challenge and is much needed since the subsurface is oen heterogeneous, and oxygen tension varies in time and space.…”

Section: Introductionmentioning

confidence: 99%

Oxygen profiling of the unsaturated zone using direct push drilling

Sopilniak

Elkayam

Lev

et al. 2015

Environ. Sci.: Processes Impacts

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A methodology for oxygen profile measurements in the unsaturated zone is developed based on direct push drilling using sampling liners equipped with homemade silicone septa. The oxygen measurement is carried out by puncturing the septum with a commercial retractable optode needle fitted with a fluorescent tip. Metrological characteristics and method validation were carried out under laboratory conditions using different levels of oxygen and various water contents. The relative standard deviations under dry and water saturated soil conditions were less than 0.3% and 5% for 0.5 mg L(-1) of oxygen and less than 2% and 3% for 9 mg L(-1). Field demonstrations in a calcareous-sandstone soil aquifer treatment system with a layered clayey, marl and sandstone lithology of widely different water contents provided down to 30 m deep profiles of the dissolved oxygen level with less than 1.5 m spatial resolution. A single sensor was used for over 50 field measurements, though recalibration was required after approximately 30 measurements due to the deterioration of the fluorescent tip.

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The multi fiber optode (MuFO): A novel system for simultaneous analysis of multiple fiber optic oxygen sensors

Cited by 16 publications

References 22 publications

An Optode Sensor Array for Long-Term In Situ Oxygen Measurements in Soil and Sediment

An Optode Sensor Array for Long-Term In Situ Oxygen Measurements in Soil and Sediment

Two decades of chemical imaging of solutes in sediments and soils – a review

Oxygen profiling of the unsaturated zone using direct push drilling

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