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Scientific article
Open access
English

Newly designed gel-integrated nanostructured gold-based interconnected microelectrode arrays for continuous in situ arsenite monitoring in aquatic systems

Published inSensors and actuators. B,, Chemical., vol. 328, 128996
Publication date2021-02
Abstract

This work presents the development, characterization and field validation of newly designed gel-integrated nanostructured gold-basedmicroelectrode arrays (Au-GIMEs) enabling the direct detection of inorganic arsenite (As(III)) in fresh and marine aquatic systems. They consist of renewable Au nanoparticles (AuNP) or Au nanofilaments (AuNF) electroplated on 100- to 500- interconnected iridium (Ir)-based microdisk arrays and covered with a gel. The gel protects the sensor surface from fouling and ensures that mass transport of analytes toward the sensor surface is by diffusion only, and therefore independent of the ill-controlled hydrodynamic conditions of the media. The responses of these sensors to direct Square Wave Anodic Stripping Voltammetry (SWASV) quantification of As(III) at pH 7.6 were investigated first in 0.1 M NaNO3, then in fresh and marine water samples. The analytical responses were found to be correlated to the number of interconnected microelectrodes and the morphology of the nanostructured Au deposits but independent of the media composition. The new interconnected AuNF-GIME have sub-nanomolar detection and quantification limits fulfilling the requirement for direct monitoring of As(III) in fresh and marine aquatic systems. The AuNF-GIME were incorporated in a submersible multi-channel trace metal sensing probe for remote high-resolution monitoring. Field evaluation and validation was performed during a one-week field study in the Elbe Estuary (North Germany), from which environmental data are presented.

eng
Keywords
  • Arsenic
  • Nanostructured gold
  • Antifouling gel-integrated microelectrode arrays
  • Square wave anodic stripping voltammetry (SWASV)
  • Real-time autonomous monitoring
  • Aquatic systems
Research group
Funding
  • European Commission - INTEGRATED IN SITU CHEMICAL MAPPING PROBES [614002]
  • European Commission - Joint European Research Infrastructure network for Coastal Observatory – Novel European eXpertise for coastal observaTories [654410]
Citation (ISO format)
TERCIER WAEBER, Marie-Louise et al. Newly designed gel-integrated nanostructured gold-based interconnected microelectrode arrays for continuous in situ arsenite monitoring in aquatic systems. In: Sensors and actuators. B,, Chemical., 2021, vol. 328, p. 128996. doi: 10.1016/j.snb.2020.128996
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Article (Published version)
Identifiers
ISSN of the journal0925-4005
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Technical informations

Creation02/09/2022 12:52:00 PM
First validation02/09/2022 12:52:00 PM
Update time03/16/2023 2:37:37 AM
Status update03/16/2023 2:37:36 AM
Last indexation05/06/2024 9:44:23 AM
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