Two-dimensional determination of dissolved manganese in sediment porewaters

IF 3 3区地球科学 Q2 CHEMISTRY, MULTIDISCIPLINARY Marine Chemistry Pub Date : 2024-09-14 DOI:10.1016/j.marchem.2024.104454

Aurélia Mouret , Constance Choquel , Aubin Thibault de Chanvalon , Florian Cesbron , Thierry Jauffrais , Didier Jézéquel , Patrick Launeau , Anthony Barbe , Romain Levrard , Alan Nicol , Céline Charbonnier , Edouard Metzger

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Abstract

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.

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沉积物孔隙水中溶解锰的二维测定

我们介绍了一种通过将 DET（薄膜中的扩散平衡）和比色技术相结合，在毫米尺度上对溶解的锰进行成像的新方法。该方法是通过在 Cd(II)-POR 复合物中用锰(II)和锰(III)取代镉来测量溶解锰的卟啉方法的改良。在转用二维 DET 时需要优化 Cd-POR 的浓度。使用商用平板扫描仪和高光谱照相机进行成像。使用高光谱照相机，检测限约为 5 μM，测量范围可达 520 μM。该方法已在法国大西洋沿岸的潮汐泥滩和多毛目动物栖息的沉积物中实地应用。这些首批图像能够精确描述洞穴等二维毫米特征，并突出了生物灌溉在底栖锰通量中的作用。这项新技术提供了一种可能性，可以利用一种非破坏性工具，在广泛的实验室和现场研究中调查微环境对二维溶解锰的反应性。

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来源期刊

Marine Chemistry 化学-海洋学

CiteScore

6.00

自引率

3.30%

发文量

审稿时长

4.5 months

期刊介绍： Marine Chemistry is an international medium for the publication of original studies and occasional reviews in the field of chemistry in the marine environment, with emphasis on the dynamic approach. The journal endeavours to cover all aspects, from chemical processes to theoretical and experimental work, and, by providing a central channel of communication, to speed the flow of information in this relatively new and rapidly expanding discipline.