Phosphate determination in seawater: Toward an autonomous electrochemical method

Jońca, Justyna; Fernández, Violeta León; Thouron, Danièle; Paulmier, Aurélien; Graco, Michelle; Garçon, Véronique

doi:10.1016/j.talanta.2011.09.056

Cited by 88 publications

(46 citation statements)

References 21 publications

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“…Similar peaks were obtained at gold and glassy carbon electrodes 26,28,29. It was reported that the peak around +400 mV involves exchange of two electrons and was attributed to MoMo(VI)/Mo(IV) and the peak around 100 mV involves three electrons and was attributed to Mo (IV)/Mo (I) 28,29.…”

Section: Resultssupporting

confidence: 79%

Selective Voltammetric Analysis of o‐Diphenols from Olive Oil Using Na₂MoO₄ as Electrochemical Mediator

et al. 2012

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The complexing ability of molybdate vs. o‐diphenols has been exploited for their selective electrochemical detection. Graphite screen printed and carbon paste electrodes have been evaluated as electrochemical transducers for the selective mediated detection of o‐diphenol compounds in the presence of Na2MoO4. Immobilization of the mediator onto the electrode surface has also been achieved using different types of single and multiwall carbon nanotubes. The best sensor in terms of selectivity, sensitivity and stability was the Mo‐MW‐CNT‐NH2 modified electrode. Using the mediator either in solution or immobilized, detection of o‐diphenols with linearity in the ppm range was achieved. An amperometric flow injection analysis set‐up was used to detect the o‐diphenolic content of phenolic extracts obtained from olive oil samples.

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Section: Resultssupporting

confidence: 79%

Selective Voltammetric Analysis of o‐Diphenols from Olive Oil Using Na₂MoO₄ as Electrochemical Mediator

et al. 2012

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“…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. By virtue of their robustness, low reagent and power consumption (1.8 W), ability to store waste onboard and to operate using established chemical protocols in a miniaturized manifold, microfluidic Lab-On-Chip sensors are well-suited to in situ monitoring in natural waters (Beaton et al, 2012;Nightingale et al, 2015;Yücel et al, 2015).…”

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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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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“…Jonca et al (2011) introduced an autonomous in situ electrochemical sensor to detect phosphate in seawater. Molybdate and sulfuric acid were added to a sample of seawater to yield the phosphomolybdate complex.…”

Section: Electrochemical Techniquesmentioning

confidence: 99%

Sensing Technology for Rapid Detection of Phosphorus in Water: A Review

Islam¹,

Reza²,

Jeong³

et al. 2016

Journal of Biosystems Engineering

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Purpose: Phosphorus is an essential element for water quality control. Excessive amounts of phosphorus causes algal bloom in water, which leads to eutrophication and a decline in water quality. It is necessary to maintain the optimum amount of phosphorus present. During the last decades, various studies have been conducted to determine phosphorus content in water. In this study, we present a comprehensive overview of colorimetric, electrochemical, fluorescence, microfluidic, and remote sensing technologies for the measurement of phosphorus in water, along with their working principles and limitations. Results: The colorimetric techniques determine the concentration of phosphorus through the use of colorgenerating reagents. This is specific to a single chemical species and inexpensive to use. The electrochemical techniques operate by using a reaction of the analyte of interest to generate an electrical signal that is proportional to the sample analyte concentration. They show a good linear output, good repeatability, and a high detection capacity. The fluorescence technique is a kind of spectroscopic analysis method. The particles in the sample are excited by irradiation at a specific wavelength, emitting radiation of a different wavelength. It is possible to use this for quantitative and qualitative analysis of the target analyte. The microfluidic techniques incorporate several features to control chemical reactions in a micro device of low sample volume and reagent consumption. They are cheap and rapid methods for the detection of phosphorus in water. The remote sensing technique analyzes the sample for the target analyte using an optical technique, but without direct contact. It can cover a wider area than the other techniques mentioned in this review. Conclusion: It is concluded that the sensing technologies reviewed in this study are promising for rapid detection of phosphorus in water. The measurement range and sensitivity of the sensors have been greatly improved recently.

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Phosphate determination in seawater: Toward an autonomous electrochemical method

Cited by 88 publications

References 21 publications

Selective Voltammetric Analysis of o‐Diphenols from Olive Oil Using Na₂MoO₄ as Electrochemical Mediator

Selective Voltammetric Analysis of o‐Diphenols from Olive Oil Using Na₂MoO₄ as Electrochemical Mediator

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

Sensing Technology for Rapid Detection of Phosphorus in Water: A Review

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Phosphate determination in seawater: Toward an autonomous electrochemical method

Cited by 88 publications

References 21 publications

Selective Voltammetric Analysis of o‐Diphenols from Olive Oil Using Na2MoO4 as Electrochemical Mediator

Selective Voltammetric Analysis of o‐Diphenols from Olive Oil Using Na2MoO4 as Electrochemical Mediator

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

Sensing Technology for Rapid Detection of Phosphorus in Water: A Review

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Selective Voltammetric Analysis of o‐Diphenols from Olive Oil Using Na₂MoO₄ as Electrochemical Mediator

Selective Voltammetric Analysis of o‐Diphenols from Olive Oil Using Na₂MoO₄ as Electrochemical Mediator