Abstract
The widespread use of rare earth elements (REEs) across various industries makes them a new type of pollutant. Additionally, REEs are powerful indicators of geochemical processes. As one of the two main rivers in the Aral Sea, identifying the geochemical behavior of REEs in agricultural soils of the Syr Darya River is of great significance for subsequent indicative studies. In this study, the geochemical characteristics, influencing factors, and potential application significance of REEs in agricultural soils from three sampling areas along the Syr Darya River were analyzed using soil geography and elemental geochemical analyses. The results showed that the highest total concentration of REEs in the agricultural soil was in Area I, with a mean value of 142.49 μg/g, followed by Area III with a mean value of 124.56 μg/g, and the lowest concentration was in Area II with a mean value of 122.48 μg/g. The agricultural soils in the three regions were enriched in light rare earth elements (LREEs), with mean L/H values of 10.54, 10.13, and 10.24, respectively. The differentiation between light and heavy rare earth elements (HREEs) was also high. The concentration of REEs in agricultural soil along the Syr Darya River was primarily influenced by minerals such as monazite and zircon, rather than human activities (the pollution index of all REEs was less than 1.5). The relationship between Sm and Gd can differentiate soils impacted by agricultural activities from natural background soils. The results of this study can serve as a basis for indicative studies of REEs in Central Asia.
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This research was funded by the Tianshan Talent Training Program (2023TSYCCX0083), the National Natural Science Foundation of China (42171014), and the High-Level Training Project of Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences (E050030101).
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Yizhen Li: writing—original draft; conceptualization; methodology; formal analysis; writing—review and editing. Galymzhan Saparov: validation, investigation. Tao Zeng: validation, investigation. Jilili Abuduwaili: writing—review and editing; conceptualization; project administration; funding acquisition. Long Ma: writing—review and editing; conceptualization; formal analysis.
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Li, Y., Saparov, G., Zeng, T. et al. Geochemical behavior of rare earth elements in agricultural soils along the Syr Darya River within the Aral Sea Basin. Environ Monit Assess 196, 493 (2024). https://doi.org/10.1007/s10661-024-12647-6
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DOI: https://doi.org/10.1007/s10661-024-12647-6