Uranium release from iron-rich acid soils under IPCC elevated CO2 scenarios: One-sided organic nanocolloidal dominance rather than expected iron oxide colloids.
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| Title: | Uranium release from iron-rich acid soils under IPCC elevated CO2 scenarios: One-sided organic nanocolloidal dominance rather than expected iron oxide colloids. |
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| Authors: | Wang, Ziyan1 (AUTHOR), Cheng, Tingfeng1 (AUTHOR), Wang, Caiqin2 (AUTHOR), Zhao, Yuwei1 (AUTHOR), Zhang, Daoyong1,2 (AUTHOR) zhang-daoyong@163.com, Pan, Xiangliang1,3 (AUTHOR) panxl@zjut.edu.cn |
| Source: | Journal of Hazardous Materials. Sep2025, Vol. 496, pN.PAG-N.PAG. 1p. |
| Subjects: | Uranium, Acid soils, Intergovernmental Panel on Climate Change, Colloids, Atmospheric carbon dioxide, Environmental risk, Soil acidification |
| Abstract: | The global iron-rich acid soils, containing ppm uranium (U), support a population of billions. Because of high sensitivity of U to dissolved inorganic carbonates (DIC), global CO 2 rising may significantly influence mobility of U in soils. However, responses of U release and fractionation between various colloidal and dissolved phases to elevated CO 2 (eCO 2) were unknown. In this study, we unveiled U release behavior and underlying mechanisms in the latosol and black soils upon exposure to simulated eCO 2 using edge-cutting nanoscale IR spectroscopic mapping (NanoIR mapping) and single particle inductively coupled plasma mass spectrometry (SP-ICP-MS), combined with uranyl speciation analysis and simulation. The eCO 2 treatment significantly decreased soil pH, disintegrated soil aggregates, and caused substantial release of U. Soil acidification, rather than DIC change, governed U release and fractionation. Upon eCO 2 exposure, U was leached from soils predominantly (>90 %) in organic nanocolloidal phases, contrasting with the widely recognized iron oxide-colloidal phase in iron-rich acid soils. The dominant organic nanocolloidal U could be ascribed to the direct release of U-loaded organic nanocolloids during disintegration of organic-mineral complexes. These results imply the continuous global CO 2 rise may significantly amplify environmental and health risks of U in acid soils by significantly increasing its mobility. [Display omitted] • eCO 2 causes aggregate disintegration in acid soils governed by pH rather than DIC. • Over 90 % U release under eCO 2 with organic nanocolloids rather than Fe oxide colloids. • bearing organic nanocolloids were released during breakdown of OM-mineral complexes. • Global CO 2 rise may significantly amplify environmental risks of U in acid soils. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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