Posts Tagged 'sensor'

Sea-Bird Scientific introduces deep SeapHOx V2 moored system

Sea-Bird Scientific has introduced the Deep SeapHOx™ V2. Designed for long-term deployments in diverse environments, from shallow regions to the deep ocean, this state-of-the-art multiparameter moored system integrates the Deep SeaFET™ V2 pH sensor with the tried-and-true SBE 37 SMP-ODO MicroCAT CTD+DO sensor. The result? A powerful tool for monitoring ocean acidification and other critical physical and biological processes.

Applications and Case Studies

The Deep SeapHOx V2 is designed to support a wide range of oceanographic research and monitoring applications:

  • Carbon cycle analysis – track the movement and storage of carbon in the ocean to better understand the global carbon cycle.
  • Climate science – collect data on ocean temperature and salinity to contribute to climate models and predict future climate change scenarios.
  • Coral reef monitoring – investigate the conditions that support deep-sea coral ecosystems and assess their vulnerability to environmental changes.
  • Deoxygenation and hypoxia monitoring – measure dissolved oxygen levels to identify and study hypoxic zones, which can have significant impacts on marine life.
  • Fisheries and aquaculture – early warning and monitoring for critical marine resources that are sensitive to changing pH.
  • Food web studies – analyze the interactions between different species in the marine food web and how they are affected by environmental factors.
  • Marine biology – Study the health and behavior of marine organisms in response to changing environmental conditions.
  • Ocean acidification – monitor changes in ocean pH levels to understand the impacts of increased carbon dioxide on marine ecosystems.
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Recent developments in ionophore-based potentiometric electrochemical sensors for oceanic carbonate detection

The increasing level of atmospheric carbon dioxide (CO2) driven by human activities contributes to the global concern of climate change. A consequence of these circumstances is ocean acidification, which reduces seawater pH. The increasing absorption of atmospheric CO2 into the ocean decreases the concentration of carbonate ions and causes the sea to become more acidic, severely harming marine species. This harm to marine life has created the need for in situ carbonate sensing and monitoring to understand how marine ecosystems respond to pH reduction. Over the past few decades, many sensors with different compositions and structures have been developed to detect carbonate in seawater and other aquatic environments to simulate oceanic conditions. This review summarizes the recent developments in carbonate ionophores, a key component in carbonate electrochemical sensors, and compares the reported performance of these sensors through various parameters (e.g., sensitivity, response time, lifetime, testing media, and measuring range). Current challenges within the development of carbonate ionophores and sensors and possibilities for future research are also discussed.

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Total dissolved inorganic carbon sensor based on amperometric CO2 microsensor and local acidification

We present a dipping probe total dissolved inorganic carbon (DIC) microsensor based on a localized acidic microenvironment in front of an amperometric CO2 microsensor. The acidic milieu facilitates conversion of bicarbonate and carbonate to CO2, which in turn is reduced at a silver cathode. Interfering oxygen is removed by an acidic CrCl2 oxygen trap. Theoretical simulations of microsensor functioning were performed to find a suitable compromise between response time and near-complete conversion of bicarbonate to CO2. The sensor exhibited a linear response over a wide range of 0–8 mM DIC, with a calculated LOD of 5 μM and a 90% response time of 150 s. The sensor was successfully tested in measuring DIC in bottled mineral water and seawater. This DIC microsensor holds the potential to become an important tool in environmental sensing and beyond for measurements of DIC at high spatial and temporal resolution.

Continue reading ‘Total dissolved inorganic carbon sensor based on amperometric CO2 microsensor and local acidification’

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