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. Author manuscript; available in PMC: 2019 Jun 10.
Published in final edited form as: Environ Sci Technol. 2019 May 2;53(10):5758–5767. doi: 10.1021/acs.est.9b00407

Figure 2.

Figure 2.

X-ray absorption spectroscopy (XAS) of unreacted and reacted solids (after LOI, pH 2 and 13) from the Jackpile Mine (JP2). (A) U LIII edge EXAFS of the Jackpile Mine solid samples using the following references: uraninite, coffinite, and monomeric U(IV) for U(IV) and uranyladsorbed ferrihydrite as reference for U(VI). (B) Normalized bulk U LIII edge XANES spectra using uraninite (nano-UO2) as a reference for U(IV) and adsorbed ferrihydrite as a reference for U(VI). (C) Linear combination fitting of the U LIII edge EXAFS spectra of U(VI) and U(IV) species in the Jackpile Mine solid samples.