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Title: Iron-mediated oxidation of methoxyhydroquinone at Rifle, Colorado

Abstract

In this study, the oxidation of 2-methoxyhydroquinone (MH2Q) by ferric iron (Fe(III)) under dark conditions in the absence and presence of oxygen was investigated within a pH range of 4 – 6. While Fe(III) was capable of stoichiometrically oxidizing MH2Q under anaerobic conditions, catalytic oxidation of MH2Q was observed in the presence of O2 due to further cycling between oxygen, semiquinone radicals, and iron species. A detailed kinetic model was developed to describe the predominant mechanisms, which indicated that both the undissociated and mono-dissociated anions of MH2Q were kinetically active species towards Fe(III) reduction, with the mono-dissociated anion being the key species accounting for the pH dependence of the oxidation. The generated radical intermediates, namely semiquinone and superoxide, are of great importance in reaction chain propagation. The kinetic model may provide critical insight into the underlying mechanisms of the thermodynamic and kinetic characteristics of metal-organic interactions and assist in understanding and predicting the factors controlling iron and organic matter transformation and bioavailability in aquatic systems.

Authors:
; ;
Publication Date:
DOE Contract Number:  
DEAC0205CH11231
Product Type:
Dataset
Research Org.:
Watershed Functionality Scientific Focus Area
Sponsoring Org.:
U.S. Department of Energy Office of Science Office of Biological and Environmental Research
Subject:
54 ENVIRONMENTAL SCIENCES
OSTI Identifier:
1508396
DOI:
https://doi.org/10.21952/WTR/1508396

Citation Formats

Davis, James, Nico, Peter, and Yuan, Xiu. Iron-mediated oxidation of methoxyhydroquinone at Rifle, Colorado. United States: N. p., 2019. Web. doi:10.21952/WTR/1508396.
Davis, James, Nico, Peter, & Yuan, Xiu. Iron-mediated oxidation of methoxyhydroquinone at Rifle, Colorado. United States. doi:https://doi.org/10.21952/WTR/1508396
Davis, James, Nico, Peter, and Yuan, Xiu. 2019. "Iron-mediated oxidation of methoxyhydroquinone at Rifle, Colorado". United States. doi:https://doi.org/10.21952/WTR/1508396. https://www.osti.gov/servlets/purl/1508396. Pub date:Tue Jan 01 00:00:00 EST 2019
@article{osti_1508396,
title = {Iron-mediated oxidation of methoxyhydroquinone at Rifle, Colorado},
author = {Davis, James and Nico, Peter and Yuan, Xiu},
abstractNote = {In this study, the oxidation of 2-methoxyhydroquinone (MH2Q) by ferric iron (Fe(III)) under dark conditions in the absence and presence of oxygen was investigated within a pH range of 4 – 6. While Fe(III) was capable of stoichiometrically oxidizing MH2Q under anaerobic conditions, catalytic oxidation of MH2Q was observed in the presence of O2 due to further cycling between oxygen, semiquinone radicals, and iron species. A detailed kinetic model was developed to describe the predominant mechanisms, which indicated that both the undissociated and mono-dissociated anions of MH2Q were kinetically active species towards Fe(III) reduction, with the mono-dissociated anion being the key species accounting for the pH dependence of the oxidation. The generated radical intermediates, namely semiquinone and superoxide, are of great importance in reaction chain propagation. The kinetic model may provide critical insight into the underlying mechanisms of the thermodynamic and kinetic characteristics of metal-organic interactions and assist in understanding and predicting the factors controlling iron and organic matter transformation and bioavailability in aquatic systems.},
doi = {10.21952/WTR/1508396},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {1}
}