A Mn-54 radiotracer study of Mn isotope solid-liquid exchange during reductive transformation of vernadite (δ-MnO2) by aqueous Mn(II)

Environmental Science & Technology
Evert J Elzinga, Adam B Kustka

Abstract

We employed Mn-54 radiotracers to characterize the extent and dynamics of Mn atom exchange between aqueous Mn(II) and vernadite (δ-Mn(IV)O2) at pH 7.5 under anoxic conditions. Exchange of Mn atoms between the solid and liquid phase is rapid, reaching dynamic equilibrium in 2-4 days. We propose that during the initial stages of reaction, Mn atom exchange occurs through consecutive comproportionation-disproportionation reactions where interfacial electron transfer from adsorbed Mn(II) to lattice Mn(IV) generates labile Mn(III) cations that rapidly disproportionate to reform aqueous Mn(II) and solid-phase Mn(IV). Following nucleation of Mn(III)OOH phases, additional exchange likely occurs through electron transfer from aqueous Mn(II) to solid-phase Mn(III). Our results provide evidence for the fast and extensive production of transient Mn(III) species at the vernadite surface upon contact of this substrate with dissolved Mn(II). We further show that HEPES buffer is a reductant of lattice Mn(IV) in the vernadite structure in our experiments. The methods and results presented here introduce application of Mn-54 tracers as a facile tool to further investigate the formation kinetics of labile Mn(III) surface species and their impacts ...Continue Reading

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Citations

Aug 4, 2015·Environmental Science & Technology·Anna A Simanova, Jasquelin Peña
Jun 2, 2016·Environmental Science & Technology·Andrew J FrierdichMichelle M Scherer
Feb 15, 2017·Environmental Science & Technology·Margaret A G HinkleJeffrey G Catalano
Feb 9, 2019·Proceedings of the National Academy of Sciences of the United States of America·Sandra D TaylorKevin M Rosso
Dec 14, 2018·Environmental Science. Processes & Impacts·Sarah BalgooyenMatthew Ginder-Vogel
Nov 2, 2019·Environmental Science. Processes & Impacts·Erdan HuFeng He
Feb 19, 2021·Environmental Science & Technology·Peng YangMengqiang Zhu
Oct 22, 2020·Journal of Hazardous Materials·Niloofar KarimianEdward D Burton
Apr 4, 2021·International Journal of Environmental Research and Public Health·Zheyong LiShuxin Tu
Apr 23, 2021·Environmental Science. Processes & Impacts·Jordan StanberryVasileios Anagnostopoulos
Jun 29, 2021·Frontiers in Microbiology·Douglas E LaRoweJan P Amend
Jul 18, 2017·Journal of the American Chemical Society·Alexandra V SoldatovaThomas G Spiro
Jul 18, 2017·Journal of the American Chemical Society·Alexandra V SoldatovaThomas G Spiro
May 30, 2020·Environmental Science & Technology·Rasesh PokharelKhalil Hanna
Jan 13, 2018·Environmental Science & Technology·Tobias HensAndrew J Frierdich
Jun 1, 2019·Environmental Science & Technology·Peng YangMengqiang Zhu
Jan 23, 2018·Environmental Science & Technology·Qian WangMengqiang Zhu
Nov 2, 2019·Environmental Science & Technology·Silvan WickAndreas Voegelin
Jun 20, 2020·Environmental Science & Technology·Dong MaMengqiang Zhu
Feb 13, 2018·Environmental Science & Technology·Yuheng WangJasquelin Peña

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