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Electron Transfer Between Sulfide and Humic Acid: Electrochemical Evaluation of the Reactivity of Sigma-Aldrich Humic Acid Toward Sulfide

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Abstract

Little is known of potential reactivity and redox properties of reduced dissolved organic matter (DOM), although DOM in anoxic environments, e.g., groundwater, peat soils, or lake sediments, can be expected to differ from DOM of oxidized environments. We therefore investigated the impact of electrochemical and wet chemical [hydrogen (H2)/Pd catalyst] reduction in Sigma-Aldrich humic acid (HA) as a model DOM for high salinity, high ionic strength, or iron-rich systems on its reactivity toward sulfide. Mediated electrochemical measurement showed that the reactivity of HA toward sulfide decreased in the order non-reduced HA > electrochemically reduced (−0.1 V) HA > H2/Pd-reduced HA > electrochemically reduced (−0.4 V) HA. Results indicated that measured initial values of electron-accepting capacities of HA had a strongly positive correlation with the sulfide transformation, except for the H2/Pd treatment of HA. This latter treatment obviously changed HA structures and lead to a different reactivity toward sulfide, limiting a direct comparison to electrochemically reduced organic matter. Our result confirmed that reduced HA was still reactive toward sulfide, although to a lower extent compared with oxidized HA. Compared to electrochemical reduction, H2/Pd pre-treatment of HA alters redox properties and reactivity of organic matter and may therefore lead to results that cannot be transferred to natural systems.

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Acknowledgments

We gratefully acknowledge student assistants Daniela Braun and Sarah Hofmann for laboratory work support, and also thank Zhengrong Xue, Jutta Eckert, and Silke Hammer for technical support. The study was funded by the German Research Foundation, research group ‘electron transfer processes in anoxic aquifers.’ (FOR 580, KN 929/2-1).

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Author notes

  1. Zhi-Guo Yu & Klaus-Holger Knorr

    Present address: Hydrology Group, Institute of Landscape Ecology, University of Münster, 48149, Münster, Germany

Authors and Affiliations

  1. Limnological Research Station and Department of Hydrology, University of Bayreuth, Universitätsstrasse 30, 95447, Bayreuth, Germany

    Zhi-Guo Yu & Klaus-Holger Knorr

  2. Center for Applied Geosciences (ZAG), Eberhard Karls Universität Tübingen, Hölderlinstrasse 12, 72074, Tübingen, Germany

    Silvia Orsetti & Stefan B. Haderlein

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  1. Zhi-Guo Yu
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  2. Silvia Orsetti
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  3. Stefan B. Haderlein
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  4. Klaus-Holger Knorr
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Correspondence to Klaus-Holger Knorr.

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Yu, ZG., Orsetti, S., Haderlein, S.B. et al. Electron Transfer Between Sulfide and Humic Acid: Electrochemical Evaluation of the Reactivity of Sigma-Aldrich Humic Acid Toward Sulfide. Aquat Geochem 22, 117–130 (2016). https://doi.org/10.1007/s10498-015-9280-0

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  • DOI: https://doi.org/10.1007/s10498-015-9280-0

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