Solid State Sensor for Simultaneous Measurement of Total Alkalinity and pH of Seawater

Briggs, Ellen M.; Sandoval, Sergio; Erten, Ahmet; Takeshita, Yuichiro; Kummel, Andrew C.; Martz, Todd R.

doi:10.1021/acssensors.7b00305

Cited by 36 publications

(37 citation statements)

References 39 publications

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“…Successful deployments of lab-on-chip devices on underwater gliders have been demonstrated for nitrate [153]. Innovative TA sensors that generate hydrogen ions in situ through coulometry [122] or ionselective membranes [123] to conduct chronopotentiometric titrations have also been demonstrated in the laboratory. These sensors are small, solid state, and low power, making them promising candidates for in situ sensing applications.…”

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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“…Alternatively, simultaneous measurements of the pH, O 2 , and TA gradients in the turbulent benthic boundary layer would also quantify Q, as chemical gradients in the turbulent boundary layer are driven by benthic metabolism. However, autonomous TA sensing technology still remains in the prototype phase and is not widely available (Crespo et al, 2012;Spaulding et al, 2014;Briggs et al, 2017).…”

Section: Benthic Metabolic Ratesmentioning

confidence: 99%

Coral Reef Carbonate Chemistry Variability at Different Functional Scales

et al. 2018

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There is a growing recognition for the need to understand how seawater carbonate chemistry over coral reef environments will change in a high-CO 2 world to better assess the impacts of ocean acidification on these valuable ecosystems. Coral reefs modify overlying water column chemistry through biogeochemical processes such as net community organic carbon production (NCP) and calcification (NCC). However, the relative importance and influence of these processes on seawater carbonate chemistry vary across multiple functional scales (defined here as space, time, and benthic community composition), and have not been fully constrained. Here, we use Bermuda as a case study to assess (1) spatiotemporal variability in physical and chemical parameters along a depth gradient at a rim reef location, (2) the spatial variability of total alkalinity (TA) and dissolved inorganic carbon (DIC) over distinct benthic habitats to infer NCC:NCP ratios [< several km 2 ; rim reef vs. seagrass and calcium carbonate (CaCO 3 ) sediments] on diel timescales, and (3) compare how TA-DIC relationships and NCC:NCP vary as we expand functional scales from local habitats to the entire reef platform (10's of km 2 ) on seasonal to interannual timescales. Our results demonstrate that TA-DIC relationships were strongly driven by local benthic metabolism and community composition over diel cycles. However, as the spatial scale expanded to the reef platform, the TA-DIC relationship reflected processes that were integrated over larger spatiotemporal scales, with effects of NCC becoming increasingly more important over NCP. This study demonstrates the importance of considering drivers across multiple functional scales to constrain carbonate chemistry variability over coral reefs.

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“…Prototype in situ alkalinity sensors, such as spectrophotometric SAMI-Alk (Sunburst Sensors, LLC) (Spaulding et al, 2014) and ISFET-based solid state alkalinity sensors (Briggs et al, 2017), are also emerging, and have the potential to achieve low cost, similar to other pH, pCO 2 , and DIC sensors due to the similarity of detection principles (i.e., spectrophotometric and ISFET). These new TA and DIC sensors have all been developed with the goal of climate-quality While originally applied for nutrient sensing, Lab-on-a-chip (LOC) technology has also been applied to the in situ detection of pH (Rerolle et al, 2018), DIC, and TA.…”

Section: The Carbon Dioxide Systemmentioning

confidence: 99%