In Situ Phosphate Monitoring in Seawater: Today and Tomorrow

Jońca, Justyna; Comtat, Maurice; Garçon, Véronique

doi:10.1007/978-3-642-37006-9_2

Cited by 11 publications

(12 citation statements)

References 46 publications

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“…In the last 15 years, several research and commercial devices have been developed for in situ monitoring of phosphate in natural waters (Thouron et al, 2003;Jońca et al, 2013a;Legiret et al, 2013). The overwhelming majority of these devices are wet chemical analyzers (Jońca et al, 2013a), many of which operate using the molybdenum blue chemistry developed by Murphy and Riley (1962).…”

Section: Introductionmentioning

confidence: 99%

“…The overwhelming majority of these devices are wet chemical analyzers (Jońca et al, 2013a), many of which operate using the molybdenum blue chemistry developed by Murphy and Riley (1962). Electrochemical reagentless sensors, which hold great promise for long-term unattended operations on fixed and mobile platforms, have recently been developed (Jońca et al, 2011(Jońca et al, , 2013bBarus et al, 2016), but require further development and extensive field testing prior to use during field campaigns.…”

Section: Introductionmentioning

confidence: 99%

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A Lab-On-Chip Phosphate Analyzer for Long-term In Situ Monitoring at Fixed Observatories: Optimization and Performance Evaluation in Estuarine and Oligotrophic Coastal Waters

et al. 2017

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The development of phosphate sensors suitable for long-term in situ deployments in natural waters, is essential to improve our understanding of the distribution, fluxes, and biogeochemical role of this key nutrient in a changing ocean. Here, we describe the optimization of the molybdenum blue method for in situ work using a lab-on-chip (LOC) analyzer and evaluate its performance in the laboratory and at two contrasting field sites. The in situ performance of the LOC sensor is evaluated using hourly time-series data from a 56-day trial in Southampton Water (UK), as well as a month-long deployment in the subtropical oligotrophic waters of Kaneohe Bay (Hawaii, USA). In Kaneohe Bay, where phosphate concentrations were characteristic of the dry season (0.13 ± 0.03 µM, n = 704), the in situ sensor accuracy was 16 ± 12% and a potential diurnal cycle in phosphate concentrations was observed. In Southampton Water, the sensor data (1.02 ± 0.40 µM, n = 1,267) were accurate to ±0.10 µM relative to discrete reference samples. Hourly in situ monitoring revealed striking tidal and storm derived fluctuations in phosphate concentrations in Southampton Water that would not have been captured via discrete sampling. We show the impact of storms on phosphate concentrations in Southampton Water is modulated by the spring-neap tidal cycle and that the 10-fold decline in phosphate concentrations observed during the later stages of the deployment was consistent with the timing of a spring phytoplankton bloom in the English Channel. Under controlled laboratory conditions in a 250 L tank, the sensor demonstrated an accuracy and precision better than 10% irrespective of the salinity (0-30), turbidity (0-100 NTU), colored dissolved organic matter (CDOM) concentration (0-10 mg/L), and temperature Grand et al.In situ Lab-On-Chip Phosphate Sensor (5-20 • C) of the water (0.3-13 µM phosphate) being analyzed. This work demonstrates that the LOC technology is mature enough to quantify the influence of stochastic events on nutrient budgets and to elucidate the role of phosphate in regulating phytoplankton productivity and community composition in estuarine and coastal regimes.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Lab-On-Chip Phosphate Analyzer for Long-term In Situ Monitoring at Fixed Observatories: Optimization and Performance Evaluation in Estuarine and Oligotrophic Coastal Waters

et al. 2017

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“…Electrochemistry proposes promising reagentless sensors that could facilitate miniaturization and decrease energy requirements (Lacombe et al, 2008). Electrochemical methods have been developed to detect silicate (Barus et al, 2016(Barus et al, , 2018 and phosphate (Jońca et al, 2011(Jońca et al, , 2013 in seawater. As silicate and phosphate are non-electroactive compounds, a chemical reaction with molybdates under acidic pH is required to transform these nutrients into silico-and phospho-molybdic complexes.…”

Section: Electrochemical Sensorsmentioning

confidence: 99%

Toward a Harmonization for Using in situ Nutrient Sensors in the Marine Environment

et al. 2020

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“…In oceanographic studies, the most commonly measured chemical form of phosphorus is phosphate (PO 4 3− ). PO 4 3− concentrations are traditionally determined following manual sampling of seawater; water is collected at known times and depths, filtered (0.20 or 0.45 µm), and then preserved for laboratory analysis on board ships or on land (Jońca et al, 2013). There are numerous sample preservation approaches available for nutrient analysis; these include filtration, heating, pasteurisation, refrigeration, freezing and chemical poisoning, with diverse recommendations found in the literature (Clementson and Wayte, 1992;Dore et al, 1996;Aminot and Kérouel, 1997;Kattner, 1999;Gardolinski et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

“…Electrochemical PO 4 3− sensor prototypes under development have the potential to offer small, low power, and reagent free detection. However, current prototypes are not sufficiently developed for large scale use (Jońca et al, 2013;Daniel et al, 2020;Wei et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Exploring Ocean Biogeochemistry Using a Lab-on-Chip Phosphate Analyser on an Underwater Glider

et al. 2021

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The ability to make measurements of phosphate (PO43–) concentrations at temporal and spatial scales beyond those offered by shipboard observations offers new opportunities for investigations of the marine phosphorus cycle. We here report the first in situ PO43– dataset from an underwater glider (Kongsberg Seaglider) equipped with a PO43– Lab-on-Chip (LoC) analyser. Over 44 days, a 120 km transect was conducted in the northern North Sea during late summer (August and September). Surface depletion of PO43– (<0.2 μM) was observed above a seasonal thermocline, with elevated, but variable concentrations within the bottom layer (0.30–0.65 μM). Part of the variability in the bottom layer is attributed to the regional circulation and across shelf exchange, with the highest PO43– concentrations being associated with elevated salinities in northernmost regions, consistent with nutrient rich North Atlantic water intruding onto the shelf. Our study represents a significant step forward in autonomous underwater vehicle sensor capabilities and presents new capability to extend research into the marine phosphorous cycle and, when combined with other recent LoC developments, nutrient stoichiometry.

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In Situ Phosphate Monitoring in Seawater: Today and Tomorrow

Cited by 11 publications

References 46 publications

A Lab-On-Chip Phosphate Analyzer for Long-term In Situ Monitoring at Fixed Observatories: Optimization and Performance Evaluation in Estuarine and Oligotrophic Coastal Waters

A Lab-On-Chip Phosphate Analyzer for Long-term In Situ Monitoring at Fixed Observatories: Optimization and Performance Evaluation in Estuarine and Oligotrophic Coastal Waters

Toward a Harmonization for Using in situ Nutrient Sensors in the Marine Environment

Exploring Ocean Biogeochemistry Using a Lab-on-Chip Phosphate Analyser on an Underwater Glider

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