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Hexavalent uranium diffusion into soils from concentrated acidic and alkaline solutions

Tokunaga, Tetsu K., Wan, Jiamin

2004enuraniumdiffusionsoilsacidicalkaline

Abstract

Language:

Uranium contamination of soils and sediments often originates from acidic or alkaline waste sources, with diffusion being a major transport mechanism. This study aims to measure U(VI) diffusion from initially pH 2 and pH 11 solutions into slightly alkaline Altamont soil and neutral Oak Ridge soil. The methodology included monitoring uptake from boundary reservoirs and measuring U concentration profiles within soil columns. The soils provided pH buffering, resulting in diffusion at nearly constant pH levels. Micro x-ray absorption near edge structure spectra confirmed that U remained in U(VI) forms in all soils tested. The time trends of U(VI) depletion from reservoirs and U(VI) concentration profiles yielded distribution coefficients (Kd) consistent with those determined in batch tests at comparable concentrations (approximately 1 mM), which were significantly lower than values for sorption at much lower concentrations (nM to µM). These results indicate that U(VI) transport at high concentrations can occur relatively quickly at non-neutral pH due to weak sorption and negligible surface diffusion.

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Cite This Work

@article{558ee963-c6b0-4d15-b51f-ffa10988c7d3,
  title={Hexavalent uranium diffusion into soils from concentrated acidic and alkaline solutions},
  author={Tokunaga and Tetsu K. and Wan and Jiamin},
  year={2004},
  language={en}
}
TY  - JOUR
TI  - Hexavalent uranium diffusion into soils from concentrated acidic and alkaline solutions
AU  - Tokunaga
AU  - Tetsu K.
AU  - Wan
AU  - Jiamin
PY  - 2004
LA  - en
ER  -

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