Enhanced Dissolution of Manganese Oxide in Ice Compared to Aqueous Phase under Illuminated and Dark Conditions
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, w...
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AMER CHEMICAL SOC
2012
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Online Access: | https://oasis.postech.ac.kr/handle/2014.oak/16217 https://doi.org/10.1021/ES302003Z |
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ftponangunivst:oai:oasis.postech.ac.kr:2014.oak/16217 2023-05-15T15:15:46+02:00 Enhanced Dissolution of Manganese Oxide in Ice Compared to Aqueous Phase under Illuminated and Dark Conditions Kim, K Yoon, HI Choi, W 환경공학부 10105056 Choi, W 2012-12-18 https://oasis.postech.ac.kr/handle/2014.oak/16217 https://doi.org/10.1021/ES302003Z English eng AMER CHEMICAL SOC ENVIRONMENTAL SCIENCE & TECHNOLOGY 46 24 13160 13166 SCI급, SCOPUS 등재논문 SCI Engineering, Environmental Environmental Sciences Engineering Environmental Sciences & Ecology 0013-936X 2012-OAK-0000026160 https://oasis.postech.ac.kr/handle/2014.oak/16217 doi:10.1021/ES302003Z 14435 ENVIRONMENTAL SCIENCE & TECHNOLOGY, v.46, no.24, pp.13160 - 13166 000312432200018 2-s2.0-84871305843 REDUCTIVE DISSOLUTION OXIDATION ACID SNOW MONOCHLOROPHENOLS PHOTOCHEMISTRY ACCELERATION BIRNESSITE MECHANISM IRON(III) IRON MINERALS KINETICS Article ART 2012 ftponangunivst https://doi.org/10.1021/ES302003Z 2022-10-20T20:10:27Z 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 degrees C) under dark and light irradiation (visible: lambda > 400 nm and UV: lambda > 300 nm) in comparison with their counterparts in aqueous solution (at 25 degrees 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 of Mn(II)(aq) in ice can be mainly explained in terms of freeze concentration of electron donors, protons, and MnO2 in liquid-like ice grain boundaries. The outdoor solar experiment conducted in Arctic region (Ny-angstrom lesund, Svalbard, 78 degrees 55'N) also showed that the photoreductive dissolution of manganese oxide is enhanced in ice. The present results imply that the dissolution of natural minerals like manganese oxides can be enhanced in icy environments such as polar region, upper atmosphere, and frozen soil. X 1 1 17 13 scie scopus Article in Journal/Newspaper Arctic Svalbard Pohang University of Science and Technology (POSTECH): Open Access System for Information Sharing (OASIS) Arctic Lambda ENVELOPE(-62.983,-62.983,-64.300,-64.300) Lesund ENVELOPE(8.470,8.470,63.331,63.331) Svalbard Environmental Science & Technology 46 24 13160 13166 |
institution |
Open Polar |
collection |
Pohang University of Science and Technology (POSTECH): Open Access System for Information Sharing (OASIS) |
op_collection_id |
ftponangunivst |
language |
English |
topic |
REDUCTIVE DISSOLUTION OXIDATION ACID SNOW MONOCHLOROPHENOLS PHOTOCHEMISTRY ACCELERATION BIRNESSITE MECHANISM IRON(III) IRON MINERALS KINETICS |
spellingShingle |
REDUCTIVE DISSOLUTION OXIDATION ACID SNOW MONOCHLOROPHENOLS PHOTOCHEMISTRY ACCELERATION BIRNESSITE MECHANISM IRON(III) IRON MINERALS KINETICS Kim, K Yoon, HI Choi, W Enhanced Dissolution of Manganese Oxide in Ice Compared to Aqueous Phase under Illuminated and Dark Conditions |
topic_facet |
REDUCTIVE DISSOLUTION OXIDATION ACID SNOW MONOCHLOROPHENOLS PHOTOCHEMISTRY ACCELERATION BIRNESSITE MECHANISM IRON(III) IRON MINERALS KINETICS |
description |
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 degrees C) under dark and light irradiation (visible: lambda > 400 nm and UV: lambda > 300 nm) in comparison with their counterparts in aqueous solution (at 25 degrees 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 of Mn(II)(aq) in ice can be mainly explained in terms of freeze concentration of electron donors, protons, and MnO2 in liquid-like ice grain boundaries. The outdoor solar experiment conducted in Arctic region (Ny-angstrom lesund, Svalbard, 78 degrees 55'N) also showed that the photoreductive dissolution of manganese oxide is enhanced in ice. The present results imply that the dissolution of natural minerals like manganese oxides can be enhanced in icy environments such as polar region, upper atmosphere, and frozen soil. X 1 1 17 13 scie scopus |
author2 |
환경공학부 10105056 Choi, W |
format |
Article in Journal/Newspaper |
author |
Kim, K Yoon, HI Choi, W |
author_facet |
Kim, K Yoon, HI Choi, W |
author_sort |
Kim, K |
title |
Enhanced Dissolution of Manganese Oxide in Ice Compared to Aqueous Phase under Illuminated and Dark Conditions |
title_short |
Enhanced Dissolution of Manganese Oxide in Ice Compared to Aqueous Phase under Illuminated and Dark Conditions |
title_full |
Enhanced Dissolution of Manganese Oxide in Ice Compared to Aqueous Phase under Illuminated and Dark Conditions |
title_fullStr |
Enhanced Dissolution of Manganese Oxide in Ice Compared to Aqueous Phase under Illuminated and Dark Conditions |
title_full_unstemmed |
Enhanced Dissolution of Manganese Oxide in Ice Compared to Aqueous Phase under Illuminated and Dark Conditions |
title_sort |
enhanced dissolution of manganese oxide in ice compared to aqueous phase under illuminated and dark conditions |
publisher |
AMER CHEMICAL SOC |
publishDate |
2012 |
url |
https://oasis.postech.ac.kr/handle/2014.oak/16217 https://doi.org/10.1021/ES302003Z |
long_lat |
ENVELOPE(-62.983,-62.983,-64.300,-64.300) ENVELOPE(8.470,8.470,63.331,63.331) |
geographic |
Arctic Lambda Lesund Svalbard |
geographic_facet |
Arctic Lambda Lesund Svalbard |
genre |
Arctic Svalbard |
genre_facet |
Arctic Svalbard |
op_relation |
ENVIRONMENTAL SCIENCE & TECHNOLOGY 46 24 13160 13166 SCI급, SCOPUS 등재논문 SCI Engineering, Environmental Environmental Sciences Engineering Environmental Sciences & Ecology 0013-936X 2012-OAK-0000026160 https://oasis.postech.ac.kr/handle/2014.oak/16217 doi:10.1021/ES302003Z 14435 ENVIRONMENTAL SCIENCE & TECHNOLOGY, v.46, no.24, pp.13160 - 13166 000312432200018 2-s2.0-84871305843 |
op_doi |
https://doi.org/10.1021/ES302003Z |
container_title |
Environmental Science & Technology |
container_volume |
46 |
container_issue |
24 |
container_start_page |
13160 |
op_container_end_page |
13166 |
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1766346100973764608 |