TY - JOUR
T1 - Mobilization of As, Fe, and Mn from Contaminated Sediment in Aerobic and Anaerobic Conditions
T2 - Chemical or Microbiological Triggers?
AU - Devore, Cherie L.
AU - Rodriguez-Freire, Lucia
AU - Villa, Noelani
AU - Soleimanifar, Maedeh
AU - Gonzalez-Estrella, Jorge
AU - Ali, Abdul Mehdi S.
AU - Lezama-Pacheco, Juan
AU - Ducheneaux, Carlyle
AU - Cerrato, José M.
N1 - Funding Information:
We would like to acknowledge the Cheyenne River Sioux Tribe Environment Department and community members that were instrumental in accessing field sites for this work. Funding for this work has been provided by the National Institute for Environmental Health Sciences (NIEHS) Award Number P42ES025589; the University of New Mexico (UNM) Center for Native Environmental Health Equity Research─A Center of Excellence In Environmental Health Disparities Research─funded jointly by grants from NIEHS and NIMHD (1P50ES026102) and the U.S. Environmental Protection Agency (EPA) (#83615701); and the Center for Water and the Environment, funded by the National Science Foundation (CREST Grant Number 1345169). This material was developed in part under Assistance Agreement No. 83615701 awarded by the U.S. Environmental Protection Agency to the University of New Mexico Health Sciences Center. It has not been formally reviewed by the EPA. The views expressed are solely those of the speakers and do not necessarily reflect those of the agencies. The EPA does not endorse any products or commercial services mentioned in this publication. Use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515.
Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.
PY - 2022/7/21
Y1 - 2022/7/21
N2 - We integrated aqueous chemistry, spectroscopy, and microbiology techniques to identify chemical and microbial processes affecting the release of arsenic (As), iron (Fe), and manganese (Mn) from contaminated sediments exposed to aerobic and anaerobic conditions. The sediments were collected from Cheyenne River Sioux Tribal lands in South Dakota, which has dealt with mining legacy for several decades. The range of concentrations of total As measured from contaminated sediments was 96 to 259 mg kg-1, which co-occurs with Fe (21 000-22 005 mg kg-1) and Mn (682-703 mg kg-1). The transition from aerobic to anaerobic redox conditions yielded the highest microbial diversity, and the release of the highest concentrations of As, Fe, and Mn in batch experiments reacted with an exogenous electron donor (glucose). The reduction of As was confirmed by XANES analyses when transitioning from aerobic to anaerobic conditions. In contrast, the releases of As, Fe and Mn after a reaction with phosphate was at least 1 order of magnitude lower compared with experiments amended with glucose. Our results indicate that mine waste sediments amended with an exogenous electron donor trigger microbial reductive dissolution caused by anaerobic respiration. These dissolution processes can affect metal mobilization in systems transitioning from aerobic to anaerobic conditions in redox gradients. Our results are relevant for natural systems, for surface and groundwater exchange, or other systems in which metal cycling is influenced by chemical and biological processes.
AB - We integrated aqueous chemistry, spectroscopy, and microbiology techniques to identify chemical and microbial processes affecting the release of arsenic (As), iron (Fe), and manganese (Mn) from contaminated sediments exposed to aerobic and anaerobic conditions. The sediments were collected from Cheyenne River Sioux Tribal lands in South Dakota, which has dealt with mining legacy for several decades. The range of concentrations of total As measured from contaminated sediments was 96 to 259 mg kg-1, which co-occurs with Fe (21 000-22 005 mg kg-1) and Mn (682-703 mg kg-1). The transition from aerobic to anaerobic redox conditions yielded the highest microbial diversity, and the release of the highest concentrations of As, Fe, and Mn in batch experiments reacted with an exogenous electron donor (glucose). The reduction of As was confirmed by XANES analyses when transitioning from aerobic to anaerobic conditions. In contrast, the releases of As, Fe and Mn after a reaction with phosphate was at least 1 order of magnitude lower compared with experiments amended with glucose. Our results indicate that mine waste sediments amended with an exogenous electron donor trigger microbial reductive dissolution caused by anaerobic respiration. These dissolution processes can affect metal mobilization in systems transitioning from aerobic to anaerobic conditions in redox gradients. Our results are relevant for natural systems, for surface and groundwater exchange, or other systems in which metal cycling is influenced by chemical and biological processes.
KW - arsenic
KW - microorganisms
KW - mine waste
KW - redox
KW - reductive dissolution
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U2 - 10.1021/acsearthspacechem.1c00370
DO - 10.1021/acsearthspacechem.1c00370
M3 - Article
AN - SCOPUS:85135026304
SN - 2472-3452
VL - 6
SP - 1644
EP - 1654
JO - ACS Earth and Space Chemistry
JF - ACS Earth and Space Chemistry
IS - 7
ER -