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ORIGINAL RESEARCH
Leaching Behavior and Leaching Mechanism
Analysis of Pb in Soil Under the Action of Sulfate
Leaching Agent: A Case Study
of Ion-Adsorption Rare Earth Mining Area
1
Jiangxi Province Key Laboratory of Environmental Geotechnical Engineering and Hazards Control, Jiangxi University
of Science and Technology, Ganzhou 341000, China
2
School of Resources Environmental Engineering, Jiangxi University of Science and Technology,
Ganzhou 341000, China
3
National-local Joint Engineering Laboratory of Water Engineering Safety and Efficient Utilization of Resources
in Poyang Lake Watershed, Nanchang Institute of Technology, Nanchang 330099, China
These authors had equal contribution to this work
Submission date: 2024-02-11
Final revision date: 2024-03-15
Acceptance date: 2024-04-27
Online publication date: 2024-09-02
Publication date: 2025-01-28
Corresponding author
Zuwen Liu
Jiangxi Province Key Laboratory of Environmental Geotechnical Engineering and Hazards Control, Jiangxi University of Science and Technology, Ganzhou 341000, China
Jiangxi Province Key Laboratory of Environmental Geotechnical Engineering and Hazards Control, Jiangxi University of Science and Technology, Ganzhou 341000, China
Pol. J. Environ. Stud. 2025;34(3):2783-2792
KEYWORDS
TOPICS
ABSTRACT
This study took Pb as the research object and investigated the leaching behavior of Pb under
different sulfate leaching agents and soil conditions, respectively. The results showed that the Pb content
in the soil of the mining area was as high as 182.07 mg·kg-1, mainly in exchangeable form, Fe/Mn
oxide-bound form, and residual form. Mg2+ had a more substantial promoting effect on H+ release
than NH4+, and was not affected by soil pH. When the external input pH was higher than the soil pH,
the release of Pb was mainly influenced by the soil pH. In addition, the effect of (NH4)2SO4 on Pb
leaching was significantly higher than that of MgSO4 and MgSO4-ac. The Elovich, Double logarithmic,
and Intraparticle diffusion models could fit Pb leaching in soil well, indicating that multiple factors
controlled Pb leaching. Leaching agents mainly led to the leaching of Pb in the exchangeable form,
but leaching agents could also activate Pb in the residual form, increasing the potential risk of Pb.
The leaching mechanism of Pb under the action of the sulfate leaching agent mainly includes chemical
form, soil pH, and ion exchange.
CONFLICT OF INTEREST
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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