Reducing conditions increased the mobilisation and hazardous effects of arsenic in a highly contaminated gold mine spoil
Article
Article Title | Reducing conditions increased the mobilisation and hazardous effects of arsenic in a highly contaminated gold mine spoil |
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ERA Journal ID | 4682 |
Article Category | Article |
Authors | Mensah, Albert Kobina, Marschner, Bernd, Wang, Jianxu, Bundschuh, Jochen, Wang, Shan-Li, Yang, Puu-Tai, Shaheen, Sabry M. and Rinklebe, Jörg |
Journal Title | Journal of Hazardous Materials |
Journal Citation | 436, pp. 1-11 |
Article Number | 129238 |
Number of Pages | 11 |
Year | 2022 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 0304-3894 |
1873-3336 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.jhazmat.2022.129238 |
Web Address (URL) | https://www.sciencedirect.com/science/article/abs/pii/S0304389422010287 |
Abstract | Arsenic (As) redox-induced mobilisation and speciation in polluted gold mine sites in tropical climates largely remains unknown. Here, we investigated the impact of changes in soil redox potential (EH) (−54 mV to +429 mV) on mobilisation of As and its dominant species in an abandoned spoil (total As = 4283 mg/kg) using an automated biogeochemical microcosm set-up. Arsenic mobilisation increased (85–137 mg/L) at moderately reducing conditions (−54 mV to + 200 mV)), while its reduced (6–35 mg/L) under oxic conditions (+200 to +400 mV). This indicates the high risk of As potential loss under reducing conditions. The mobilisation of As was governed by the redox chemistry of Fe. XANES and EXAFS analyses showed that sorbed-As(V)-goethite, sorbed-As(III)-ferrihydrite, scorodite and arsenopyrite were the predominant As species in the mine spoil. As(V) dominated at oxic conditions and As(III) predominated at moderately reducing conditions, which may be attributed to either inability of arsenate bacteria to reduce As or incomplete reduction. Lower Fe/As molar ratios during moderately reducing conditions show that the mine spoil may migrate As to watercourses during flooding, which may increase the hazardous effects of this toxic element. Therefore, encouraging aerobic conditions may mitigate As release and potential loss from the mine field. |
Keywords | Flooding; Gold mining; Hazardous effects; Mobilization; Toxic elements |
ANZSRC Field of Research 2020 | 4199. Other environmental sciences |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
PubMed ID | 35739757 |
Funder | Deutscher Akademischer Austauschdienst |
Byline Affiliations | Ruhr University Bochum, Germany |
Council for Scientific and Industrial Research- Soil Research Institute, Ghana | |
Chinese Academy of Sciences, China | |
University of Wuppertal, Germany | |
University of Southern Queensland | |
National Chung Cheng University, Taiwan | |
National Taiwan University, Taiwan | |
King Abdulaziz University, Saudi Arabia | |
Shoolini University, India | |
Library Services |
https://research.usq.edu.au/item/yy768/reducing-conditions-increased-the-mobilisation-and-hazardous-effects-of-arsenic-in-a-highly-contaminated-gold-mine-spoil
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