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. 2021 Aug 29;13(9):604. doi: 10.3390/toxins13090604

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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pH-time profile during Fenton oxidation under different H₂O₂/Fe(II) molar ratios. (a) The first set of experiments was conducted with initial H₂O₂ concentration of 25 μM and initial Fe(II) concentrations from 6.25 to 62.5 μM. (b) The second set of experiments was conducted with initial Fe(II) concentration of 25 μM and initial H₂O₂ concentrations from 10 to 100 μM. (The values presented are averages of three replicates, and error bars indicate the standard deviation).