Date

2021-01-01

Author

Şengör, Sema Sevinç
Sani, Rajesh K

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Uranium contamination is a widespread global problem in water supplies and aquifers due to its high toxicity and associated long-term risk for the ecosystem environment. A promising technology for in situ bioremediation of uranium is biological reduction of soluble U(VI) to insoluble U(IV) with accompanying precipitation of uraninite as nanoparticulate uraninite and mononuclear U(IV) phases. For successful environmental remediation and long-term stewardship of uranium contamination, it is important to understand the structure, composition, and stabilities of these various uraninite phases in the natural aquatic systems. This chapter aims to provide an overview of the tools for physicochemical characterization of bioreduced U phases. The chapter also presents a method for the quantification of reduced U(IV) mobile nanoparticles using numerical integration, where a trapezoidal rule is used to approximate the areas under two curves corresponding to U(VI) and filter oxidized U(VI) to determine the mobile % of U(IV) nanoparticles based on the initial concentration of U(VI). Characterization and quantification of these biogenic U(IV) phases are also critical to facilitate data interpretation in related complex flow systems in the environment and to provide data that scientists, engineers, regulators, and stakeholders can use to help assess the behavior of biogenic U(IV) in U-contaminated subsurface environments on a site-specific basis.

URI

https://doi.org/10.1002/9781119617181.ch12
https://hdl.handle.net/11511/100251

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Department of Environmental Engineering, Book / Book chapter