MOURET, Aurélia; CHOQUEL, Constance; DE CHANVALON, Aubin Thibault; CESBRON, Florian; JAUFFRAIS, Thierry; JÉZÉQUEL, Didier; LAUNEAU, Patrick; BARBE, Anthony; LEVRARD, Romain; NICOL, Alan; CHARBONNIER, Celine; METZGER, Édouard

doi:10.1016/j.marchem.2024.104454

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MOURET, Aurélia
Laboratoire de Planétologie et Géosciences [UMR_C 6112] [LPG]

CHOQUEL, Constance
Institut méditerranéen d'océanologie [MIO]

DE CHANVALON, Aubin Thibault
Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux [IPREM]

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Article de revue

Ce document a été publié dans

Marine Chemistry. 2024-11, vol. 267, p. 104454

Résumé en anglais

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.< Réduire

Mots clés en anglais

High-resolution

2D-DET

Sediment microenvironments

Bioirrigation