Electrochemical monitoring of marine nutrients: From principle to application

Hong, Wei; Pan, Dawei; Han, Haitao

doi:10.1016/j.trac.2021.116242

Cited by 13 publications

(8 citation statements)

References 145 publications

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“…6−9 However, electrochemical sensors designed for fresh water are usually inapplicable in seawater, mainly because the high salinity and complex redox components can generate false positive/negative signals, thus inflicting a major penalty to the sensitivity and specificity of the sensors. 10,11 Therefore, new electrochemical methods are in urgent need to overcome the strong matrix effect of seawater.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Various detection methods have been developed ranging from atomic absorption and emission spectroscopy to inductively coupled plasma mass spectrometry (ICP-MS), though most of them require large instruments, complex protocols, and high costs . Electrochemistry is a facile method for the detection of heavy metals with high sensitivity, low cost, fast response, and simplicity, drawing enormous attention in the field of environmental analysis. − Especially in Cu 2+ detection, mesoporous composite material due to its large electroactive surface area was successfully used for Cu 2+ capturing and sensing, achieving a limit of detection (LOD) of 0.33 μg/L; as the recognizing layer, conducting polyamide, chitosan (CS), or benzaldehyde was modified onto electrochemical sensors, bringing about an outstanding specificity and detection range. − However, electrochemical sensors designed for fresh water are usually inapplicable in seawater, mainly because the high salinity and complex redox components can generate false positive/negative signals, thus inflicting a major penalty to the sensitivity and specificity of the sensors. , Therefore, new electrochemical methods are in urgent need to overcome the strong matrix effect of seawater.…”

Section: Introductionmentioning

confidence: 99%

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Dual-Modulated Heterojunctions for Anti-Interference Sensing of Heavy Metals in Seawater

Pang

et al. 2022

Anal. Chem.

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Trace analyte detection in a complex environment such as in seawater is usually challenging for classic redox-based electrochemical sensors since the matrix effect of high salinity and various interfering species with similar redox properties can generate false positive/negative signals, thus impacting the sensitivity and specificity of the sensors. In this work, unlike redox-based approaches, we propose a novel sensing mode that relies on dual-modulated interfacial energy barriers of heterojunctions. By constructing the hierarchical structure of Ni/TiO2/porous-reduced graphene oxide/chitosan (CS), we introduce interfacial energy barriers of Schottky junctions into the electrochemical sensors for Cu2+. Most importantly, we found that two factors, light and the electrostatic interactions between the heterojunctions and Cu2+, can be coupled to regulate the height of the interfacial energy barrier and at last exponentially magnify the sensing signals in response to Cu2+. Since the electrostatic interaction is inert to redox, the proposed sensor is robust against most interfering species even in seawater. Illumination further enhances its sensitivity by 6.23 times and endows it a limit of detection of 0.22 nM. Such a dual-modulated sensing mode is also valid in other heterojunctions such as in the p–n junctions of Ni/NiO/MoS2/CS, demonstrating its potential in more universal applications.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dual-Modulated Heterojunctions for Anti-Interference Sensing of Heavy Metals in Seawater

Pang

et al. 2022

Anal. Chem.

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“…The development of high-performance electrochemical devices can effectively alleviate the pressure caused by energy shortage and environmental degradation. [1,2] At present, porous composite electrodes based on composed particles appear in many fields such as electrochemical energy storage, electrocatalysis, bioelectrocatalysis as well as electrochemical sensors and are used in various electrochemical devices. [3,4] In addition to the active material particles, porous composite electrodes generally contain functional components for example, conductive agents, binders and even supporting structure (host), which results in a complex composition and geometry.…”

Section: Introductionmentioning

confidence: 99%

Single‐Particle Measurements: A Powerful Method for Investigating Electrochemical Reactions

Yang

et al. 2022

Chemistry A European J

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The relationship between interface structure (e. g., the facet of the solid phase and the configuration of solvation) and the reactivity of the corresponding electrode is a critical issue in electrochemistry. Compared to macroscopic electrode measurements, electrochemical methods established on the single-particle scale have advantages in establishing the structure-property relationship. In recent years, great achievements have been made in electrochemical energy storage and electrocatalysis that allow the evolution and kinetics of electrodes to be understood by employing single-particle measurements. This concept aims to provide an overview of the update of single-particle measurements in related electrochemical processes. Furthermore, the challenges and prospects for the development and application of single-particle measurements are also discussed.

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“…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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Electrochemical monitoring of marine nutrients: From principle to application

Cited by 13 publications

References 145 publications

Dual-Modulated Heterojunctions for Anti-Interference Sensing of Heavy Metals in Seawater

Dual-Modulated Heterojunctions for Anti-Interference Sensing of Heavy Metals in Seawater

Single‐Particle Measurements: A Powerful Method for Investigating Electrochemical Reactions

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

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