Rare earth element (REE) and arsenic mobility in acid mine drainage (AMD) impacted soil
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Rare earth element (REE) and arsenic mobility in acid mine drainage (AMD) impacted soil. / Thomas, Glenna; Sheridan, Craig; Holm, Peter E.
In: Geoderma, Vol. 443, 116817, 2024.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Rare earth element (REE) and arsenic mobility in acid mine drainage (AMD) impacted soil
AU - Thomas, Glenna
AU - Sheridan, Craig
AU - Holm, Peter E.
N1 - Publisher Copyright: © 2024
PY - 2024
Y1 - 2024
N2 - The mobility of rare earth elements (REE) and arsenic (As) from acid mine drainage (AMD) impacted soil was investigated in a column leaching study. AMD impacted soils from prominent gold and coal mining regions in South Africa were eluted with a 1 µM CaCl2 solution for 14 h and samples were collected at timed intervals corresponding to liquid to solid (L/S) ratios from 0 to 10. The results showed fast initial leaching (L/S < 5) leading to the leaching of 30–98 % of the total soil REE contents and 0.02–1.8 % of total soil As contents. The results show substantial indications of REE leachability and hence recovery from mining impacted soils. This has the potential to improve cost effectiveness of the remediation process. Conversely, As was found to be highly retained in the AMD impacted soils. This offers insights into the comparative conditions of leachability in AMD impacted soils. Further investigation into the mineral structures present in various AMD impacted soil media under leaching conditions is needed to fully explain the underlying geochemical factors responsible for the elements’ release.
AB - The mobility of rare earth elements (REE) and arsenic (As) from acid mine drainage (AMD) impacted soil was investigated in a column leaching study. AMD impacted soils from prominent gold and coal mining regions in South Africa were eluted with a 1 µM CaCl2 solution for 14 h and samples were collected at timed intervals corresponding to liquid to solid (L/S) ratios from 0 to 10. The results showed fast initial leaching (L/S < 5) leading to the leaching of 30–98 % of the total soil REE contents and 0.02–1.8 % of total soil As contents. The results show substantial indications of REE leachability and hence recovery from mining impacted soils. This has the potential to improve cost effectiveness of the remediation process. Conversely, As was found to be highly retained in the AMD impacted soils. This offers insights into the comparative conditions of leachability in AMD impacted soils. Further investigation into the mineral structures present in various AMD impacted soil media under leaching conditions is needed to fully explain the underlying geochemical factors responsible for the elements’ release.
KW - Acid mine drainage
KW - Arsenic
KW - Critical elements
KW - Leaching
KW - Rare earth elements
U2 - 10.1016/j.geoderma.2024.116817
DO - 10.1016/j.geoderma.2024.116817
M3 - Journal article
AN - SCOPUS:85185398038
VL - 443
JO - Geoderma
JF - Geoderma
SN - 0016-7061
M1 - 116817
ER -
ID: 389414374