Preprints
https://doi.org/10.5194/egusphere-2024-2101
https://doi.org/10.5194/egusphere-2024-2101
22 Aug 2024
 | 22 Aug 2024

Organic Pollutant Oxidation on Manganese Oxides in Soils – The Role of Calcite Indicated by Geoelectrical and Chemical Analyses

Sonya Sara Altzitser, Yael Golda Mishael, and Nimrod Schwartz

Abstract. Understanding phenolic pollutants interaction with soil colloids has been a focus of extensive research, primarily under controlled conditions. This study addresses the need to explore these processes in a more natural, complex soil environment. We aim to enlighten the underlying mechanisms of hydroquinone (a representative phenolic pollutant) oxidation in ambient, MnO2-rich sandy soil within soil columns designed for breakthrough experiments. Our innovative approach combines noninvasive electrical measurements, crystallographic and microscopic analyses, and chemical profiling to comprehensively understand soil-pollutant interactions. Our study reveals that hydroquinone oxidation by MnO2 initiates a cascade of reactions, altering local pH, calcite dissolution, and precipitating amorphous Mn-oxides, showcasing a complex interplay of chemical processes. Our analysis, combining insights from chemistry and electrical measurements, reveals the oxidation process led to a constant decrease in polarizing surfaces, as indicated by quadrature conductivity monitoring. Furthermore, dynamic shifts in the soil solution chemistry (changes in the calcium and manganese concentrations, pH, and EC) correlated with the non-monotonous behavior of the in-phase conductivity. Our findings conclusively demonstrate that the noninvasive electrical method allows real-time monitoring of calcite dissolution, serving as a direct cursor to the oxidation process of hydroquinone, enabling the observation of soil surface processes, and chemical interactions.

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Sonya Sara Altzitser, Yael Golda Mishael, and Nimrod Schwartz

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-2101', Damien Jougnot, 10 Sep 2024
    • AC1: 'Reply on RC1', Sonya Altzitser, 30 Oct 2024
  • RC2: 'Comment on egusphere-2024-2101', Anonymous Referee #2, 26 Sep 2024
    • AC2: 'Reply on RC2', Sonya Altzitser, 30 Oct 2024

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-2101', Damien Jougnot, 10 Sep 2024
    • AC1: 'Reply on RC1', Sonya Altzitser, 30 Oct 2024
  • RC2: 'Comment on egusphere-2024-2101', Anonymous Referee #2, 26 Sep 2024
    • AC2: 'Reply on RC2', Sonya Altzitser, 30 Oct 2024
Sonya Sara Altzitser, Yael Golda Mishael, and Nimrod Schwartz
Sonya Sara Altzitser, Yael Golda Mishael, and Nimrod Schwartz

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Short summary
Our study uses a noninvasive geoelectrical method to monitor hydroquinone oxidation in MnO2-rich soil. We combined it with chemical analyses to observe real-time changes in soil pH, calcium, and manganese levels. Our findings reveal that MnO2 oxidation of hydroquinone triggers reactions, such as calcite dissolution and amorphous manganese oxide formation. This research advances the understanding of soil-pollutant interactions and highlights the method's potential in tracking soil remediation.