Two-dimensional determination of dissolved manganese in sediment porewaters
We present a new method for imaging dissolved manganese at millimeter scale by coupling DET (diffusive equilibrium in thin film) and colorimetric techniques. The method is an adaptation of the porphyrin approach for the measurement of dissolved Mn by substitution of Mn(II) and Mn(III) to Cd in the Cd(II)–POR complex. Optimization of the Cd-POR concentrations was required for transposition to 2D-DET. A commercial flatbed scanner and a hyperspectral camera were used for imaging. Using the hyperspectral camera, detection limit is about 5 μM and measuring range is up to 520 μM. The method was applied on the field in a tidal mudflat of the French Atlantic coast and in sediments inhabited by polychaetes. These first images allowed to precisely describe two-dimensional millimeter features such as burrows and highlighted the role of bioirrigation in benthic Mn fluxes. This new technique offers the possibility to investigate the reactivity of microenvironments towards dissolved Mn in two dimensions in a wide range of laboratory and in situ studies using a non-destructive tool. • A new method for measuring 2D dissolved Mn at millimeter-scale is presented. • Development was achieved by coupling DET (diffusive equilibrium in thin film) and a porphyrin colorimetric method. • Mn sediment microenvironments can be investigated using a non-destructive tool. • Bioirrigation effect can be evidenced through the observation of burrow structures.
Authors
- Aubin Thibault de Chanvalon (ORCID: https://orcid.org/0000-0003-1750-534X)
- Céline Charbonnier
- Constance Choquel (ORCID: https://orcid.org/0000-0001-8346-2726)
- Thierry Jauffrais (ORCID: https://orcid.org/0000-0001-9681-6239)
- Patrick Launeau (ORCID: https://orcid.org/0000-0001-7465-9041)
- Alan Nicol (ORCID: https://orcid.org/0000-0002-7237-8825)
- Anthony Barbe
- Édouard Metzger (ORCID: https://orcid.org/0000-0002-5838-4540)
- Didier Jézéquel (ORCID: https://orcid.org/0000-0002-1983-9899)
- Aurélia Mouret (ORCID: https://orcid.org/0000-0002-2258-7696)
- Florian Cesbron
- Romain Levrard
Institutions
- University of New Caledonia (NC)
- Centre National de la Recherche Scientifique (FR)
- Université de Toulon (FR)
- Université de Pau et des Pays de l'Adour (FR)
- Institut de physique du globe de Paris (FR)
- Université de Bordeaux (FR)
- Université Paris Cité (FR)
- Université Nantes Angers Le Mans (FR)
- Karolinska Institutet (SE)
- Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement (FR)
- Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux (FR)
- Environnements et Paléoenvironnements Océaniques et Continentaux (FR)
- S:t Eriks Ögonsjukhus (SE)
- Laboratoire de Planétologie et Géosciences (FR)
- Gouvernement de la Nouvelle-Calédonie (NC)
- Institut Méditerranéen d’Océanologie (FR)
- Institut de Recherche pour le Développement (FR)
- Laboratoire Universitaire des Sciences Appliquées de Cherbourg
- Université Savoie Mont Blanc (FR)
- Nantes Université (FR)
Publication Details
- Journal
- Marine Chemistry
- Published
- 2024-09-14
- DOI
- https://doi.org/10.1016/j.marchem.2024.104454
- Citations
- 1
- Primary Topic
- Geochemistry and Elemental Analysis
- Type
- article
- Field-Weighted Citation Impact
- 0.35
Funders
- Centre National de la Recherche Scientifique