Enhanced dissolution of manganese oxide in ice compared to aqueous phase under illuminated and dark conditions

Environmental Science & Technology
Kitae KimWonyong Choi

Abstract

Manganese is one of the common elements in the Earth's crust and an essential micronutrient for all living things. The reductive dissolution of particulate manganese oxide is a dominant process to enhance mobility and bioavailability of manganese for the use of living organisms. In this work, we investigated the reductive dissolution of manganese oxides trapped in ice (at -20 °C) under dark and light irradiation (visible: λ > 400 nm and UV: λ > 300 nm) in comparison with their counterparts in aqueous solution (at 25 °C). The reductive dissolution of synthetic MnO₂, which took place slowly in aqueous solution, was significantly accelerated in ice phase both in the presence and absence of light: about 5 times more dissolution in ice phase than in liquid water after 6 h UV irradiation in the presence of formic acid. The enhanced dissolution in ice was observed under both UV and visible irradiation although the rate was much slower in the latter condition. The reductive dissolution rate of Mn(II)(aq) (under both irradiation and dark conditions) gradually increased with decreasing pH below 6 in both aqueous and ice phases, and the dissolution rates were consistently faster in ice under all tested conditions. The enhanced generation ...Continue Reading

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Citations

Apr 1, 2015·Proceedings of the National Academy of Sciences of the United States of America·Francesco Femi MarafattoJasquelin Peña
Oct 8, 2015·Environmental Science & Technology·Daun JeongWonyong Choi
Sep 1, 2015·Environmental Science & Technology·Kitae KimJungwon Kim
Jun 27, 2017·Environmental Science & Technology·Dae Wi Min, Wonyong Choi
Apr 30, 2014·Environmental Science. Processes & Impacts·Eun-Ju KimYoon-Seok Chang
Mar 21, 2017·Geochemical Transactions·Samantha L ShumlasDaniel R Strongin
Aug 14, 2019·Environmental Science and Pollution Research International·Nan WangDan Shang
Mar 2, 2017·Geochemical Transactions·Timothy A Doane
Mar 17, 2015·Chemical Reviews·Christian GeorgeSergey A Nizkorodov
May 14, 2019·Environmental Science & Technology·Kitae KimWonyong Choi
Nov 6, 2018·Environmental Science & Technology·Sunil Paul M MenacherryWonyong Choi
Mar 5, 2022·Environmental Science & Technology·Bo-Mi KimJae-Sung Rhee

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