A validation and comparison study of new, compact, versatile optodes for oxygen, pH and carbon dioxide in marine environments

Fritzsche, Eva; Staudinger, Christoph; Fischer, Jan; Thar, Roland; Jannasch, Hans W.; Plant, Joshua N.; Blum, Marguerite; Massion, G.; Thomas, Hans; Hoech, Jon; Johnson, Kenneth S.; Borisov, Sergey M.; Klimant, Ingo

doi:10.1016/j.marchem.2018.10.009

Cited by 21 publications

(17 citation statements)

References 51 publications

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“…Continuing to improve our current sensor designs for reliability, performance, and reduction in cost is an underappreciated yet important task. Solid state, low power optical sensors for pH and pCO 2 that use similar sensing principles to the successful and widespread O 2 sensor have shown promising results in the laboratory and on autonomous platforms [115,116]. The development of robust, autonomous measurements for additional parameters such as DIC, TA, or carbonate ion concentration ([CO 3 2− ]) is also highly desired.…”

Section: Emerging Technologiesmentioning

confidence: 99%

Observing Changes in Ocean Carbonate Chemistry: Our Autonomous Future

Bushinsky

Takeshita

Williams

2019

Curr Clim Change Rep

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Purpose of Review We summarize recent progress on autonomous observations of ocean carbonate chemistry and the development of a network of sensors capable of observing carbonate processes at multiple temporal and spatial scales. Recent Findings The development of versatile pH sensors suitable for both deployment on autonomous vehicles and in compact, fixed ecosystem observatories has been a major development in the field. The initial large-scale deployment of profiling floats equipped with these new pH sensors in the Southern Ocean has demonstrated the feasibility of a global autonomous open-ocean carbonate observing system. Summary Our developing network of autonomous carbonate observations is currently targeted at surface ocean CO 2 fluxes and compact ecosystem observatories. New integration of developed sensors on gliders and surface vehicles will increase our coastal and regional observational capability. Most autonomous platforms observe a single carbonate parameter, which leaves us reliant on the use of empirical relationships to constrain the rest of the carbonate system. Sensors now in development promise the ability to observe multiple carbonate system parameters from a range of vehicles in the near future.

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Section: Emerging Technologiesmentioning

confidence: 99%

Observing Changes in Ocean Carbonate Chemistry: Our Autonomous Future

Bushinsky

Takeshita

Williams

2019

Curr Clim Change Rep

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“…This type of calibration was also used by Fritzsche et al (2018) [35] to calibrate a sensor for marine applications. However, at low CO 2 concentrations, the sensor had a response time of over 30 min.…”

Section: Discussionmentioning

confidence: 99%

Dissolved Carbon Dioxide Sensing Platform for Freshwater and Saline Water Applications: Characterization and Validation in Aquaculture Environments

Mendes

Coelho

Kovács

et al. 2019

Sensors

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A sensing configuration for the real-time monitoring, detection, and quantification of dissolved carbon dioxide (dCO 2 ) was developed for aquaculture and other applications in freshwater and saline water. A chemical sensing membrane, based on a colorimetric indicator, is combined with multimode optical fiber and a dual wavelength light-emitting diode (LED) to measure the dCO 2 -induced absorbance changes in a self-referenced ratiometric scheme. The detection and processing were achieved with an embeded solution having a mini spectrometer and microcontroller. For optrode calibration, chemical standard solutions using sodium carbonate in acid media were used. Preliminary results in a laboratory environment showed sensitivity for small added amounts of CO 2 (0.25 mg·L −1 ). Accuracy and response time were not affected by the type of solution, while precision was affected by salinity. Calibration in freshwater showed a limit of detection (LOD) and a limit of quantification (LOQ) of 1.23 and 1.87 mg·L −1 , respectively. Results in saline water (2.5%) showed a LOD and LOQ of 1.05 and 1.16 mg·L −1 , respectively. Generally, performance was improved when moving from fresh to saline water. Studies on the dynamics of dissolved CO 2 in a recirculating shallow raceway system (SRS+RAS) prototype showed higher precision than the tested commercial sensor. The new sensor is a compact and robust device, and unlike other sensors used in aquaculture, stirring is not required for correct and fast detection. Tests performed showed that this new sensor has a fast accurate detection as well as a strong potential for assessing dCO 2 dynamics in aquaculture applications.

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“…The meters were supplied with power by the field laptop that also collected all data via USB. For information on the operating principle and construction of optical sensors for the measurement of the oxygen concentration, partial pressure of carbon dioxide and the pH, please see the current literature (e.g., Atamanchuk et al, 2014;Fritzsche et al, 2018).…”

Section: Sensorsmentioning

confidence: 99%

Portable Measurement System for in situ Estimation of Oxygen and Carbon Fluxes of Submerged Plants

et al. 2021

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The metabolism of submerged plants is commonly characterized by oxygen development. The turnover rates of carbon dioxide and other inorganic carbon species, however, are assessed only at distinct points in time after incubation or calculated through shifts in pH and total alkalinity. A novel three parameter measurement system was developed in order to improve this issue and to gain a better understanding of the metabolism of aquatic plants. It allows the simultaneous and continuous assessment of oxygen concentration, partial pressure of carbon dioxide and pH with optical sensors without the need of taking water samples. Plants or plant parts can be enclosed in a chamber, while the surrounding water is either flushed through or circulated within the system. The method was evaluated in regards to measurement time and possible stress reactions during measurement. Its applicability in situ was confirmed with Elodea nuttallii and Ceratophyllum demersum. The measurement system will enable deeper insights into the metabolism and response of aquatic plants to changing environmental conditions, especially related to carbon fixation.

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A validation and comparison study of new, compact, versatile optodes for oxygen, pH and carbon dioxide in marine environments

Cited by 21 publications

References 51 publications

Observing Changes in Ocean Carbonate Chemistry: Our Autonomous Future

Observing Changes in Ocean Carbonate Chemistry: Our Autonomous Future

Dissolved Carbon Dioxide Sensing Platform for Freshwater and Saline Water Applications: Characterization and Validation in Aquaculture Environments

Portable Measurement System for in situ Estimation of Oxygen and Carbon Fluxes of Submerged Plants

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