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Scientific article
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English

Advanced multichannel submersible probe for autonomous high-resolution in situ monitoring of the cycling of the potentially bioavailable fraction of a range of trace metals

Contributors

Tercier Waeber, Marie-Louise; Confalonieri, Fabio; Abdou, Melina; Dutruch, Lionel; Bossy, Cécile; Fighera, Marianna; Bakker, Eric; Graziottin, Flavio; van der Wal, Peter; Schäfer, Jörg

Published in

Chemosphere, vol. 282, 131014

Publication date

2021-11

Abstract

We report here on the development and application of a submersible, compact, low power consumption, integrated multichannel trace metal sensing probe (TracMetal). This probe is unique in that it allows high-resolution, simultaneous in-situ measurements of the potentially bioavailable (so-called dynamic) fraction of Hg(II), As(III), Cd(II), Pb(II), Cu(II), Zn(II). The TracMetal incorporates nanostructured Au-plated and Hg-plated gel-integrated microelectrode arrays. In addition to be selective to the fraction of metal potentially bioavailable, they offer protection against fouling and ill-controlled convective interferences. Sensitivities in the low pM for Hg(II) and sub-nM for the other target trace metals is achieved with precision ≤ 12%. The TracMetal is capable of autonomous operation during deployment, with routines for repetitive measurements (1-2 h−1), data storage and management, data computer visualization, and wireless data transfer. The system was successfully applied in the Arcachon Bay, to study the temporal variation of the dynamic fraction of the trace metals targeted. The in situ autonomous TracMetal measurements were combined with in situ measurements of the master bio-physicochemical parameters and sample collection for complementary measurements of the dissolved metal concentrations, organic matter concentrations and proxy for biological activities. The integration of all data revealed that various biotic and abiotic processes control the temporal variation of the dynamic fractions of the target metals (Medyn). The difference in the percentage of the dynamic forms of the metals studied and the short-term processes influencing their variation highlight the TracMetal potentiality as metal bioavailability-assessment sentinel to achieve comprehensive environmental monitoring of dynamic aquatic systems.

Keywords

  • Aquatic systems
  • Bioavailability
  • In situ autonomous Monitoring
  • Microsensors
  • Speciation
  • Trace metals

UNIGE affiliation entities

UNIGE research groups

Funding

  • European Commission - INTEGRATED IN SITU CHEMICAL MAPPING PROBES [614002]

Citation (ISO format)

TERCIER WAEBER, Marie-Louise et al. Advanced multichannel submersible probe for autonomous high-resolution in situ monitoring of the cycling of the potentially bioavailable fraction of a range of trace metals. In: Chemosphere, 2021, vol. 282, p. 131014. doi: 10.1016/j.chemosphere.2021.131014

Main files (1)

Article (Published version)
CC BY-NC-ND

Identifiers

Additional URL for this publication

https://linkinghub.elsevier.com/retrieve/pii/S0045653521014867

Journal ISSN

0045-6535
286views
327downloads

Technical informations

Creation

09/02/2022 12:34:00

First validation

09/02/2022 12:34:00

Update

16/03/2023 02:37:38

Status update

16/03/2023 02:37:37

Last indexation

01/11/2024 00:49:31
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