Redox behaviors of Fe(II/III) and U(IV/VI) studied in synthetic water and KURT groundwater by potentiometry and spectroscopy
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The redox behaviors of Fe(II/III) and U(IV/VI) in both synthetic samples and natural groundwater were investigated with potentiometry, UV/VIS absorption spectroscopy, and time-resolved laser fluorescence spectroscopy. Total dissolved Fe(II/III) concentration along with presence of mixed redox couples of Fe2+/Fe3+ and Fe2+/Fe2O3(s) were revealed to be the major factors influencing on the redox potentials. Considerable discrepancies between redox potentials obtained with quantitative analysis and chemical speciation of Fe(II/III) and U(IV/VI) ions were identified in the KAERI Underground Research Tunnel groundwater. Chemical speciation of U(IV) in natural groundwater without considering relevant complexation reaction might cause relatively large uncertainties in redox potential calculations.
KeywordsRedox Iron Uranium Natural groundwater
This work was supported by the Nuclear Safety Research Program (1305032-0315-CG100) through the Korea Foundation of Nuclear Safety (KOFONS), granted financial resource from the Nuclear Safety and Security Commission (NSSC), Republic of Korea.
- 3.Grenthe I, Fuger J, Konings RJM, Lemire RJ, Muller AB, Cregu CN-T, Wanner H (1992) Chemical thermodynamics of uranium. Chemical thermodynamics, vol 1. Elsevier; OECD-NEA, AmsterdamGoogle Scholar
- 4.Guillaumont R, Fanghänel T, Neck V, Fuger J, Palmer DA, Grenthe I, Rand MH (2003) Update on the chemical thermodynamics of uranium, neptunium, plutonium, americium and technetium. Chemical thermodynamics, vol 5. Elsevier; OECD-NEA, AmsterdamGoogle Scholar
- 5.Kitamura A, Fujiwara K, Doi R, Yoshida Y (2012) Update of JAEA-TDB: additional selection of thermodynamic data for solid and gaseous phases on nickel, selenium, zirconium, technetium, thorium, uranium, neptunium plutonium and americium, update of thermodynamic data on iodine, and some modifications. JAEA, TokaiGoogle Scholar
- 13.Cho W-J, Kwon S, Park J-H, Choi J-W (2007) KAERI underground research tunnel (KURT). J Korean Radioact Waste Soc 5(3):239–255Google Scholar
- 14.Fujiwara K, Yamana H, Fujii T, Moriyama H (2003) Determination of uranium(IV) hydrolysis constants and solubility product of UO2·xH2O. Radiochim Acta 91:345–350Google Scholar
- 17.Sowder AG, Clark SB, Fjeld RA (2006) The effect of sample matrix quenching on the measurement of trace uranium concentrations in aqueous solutions using kinetic phosphorimetry. J Radioanal Nucl Chem 234(1–2):257–260Google Scholar
- 18.Stumm W, Morgan JJ (1996) Aquatic chemistry, 3rd edn. Wiley, New YorkGoogle Scholar
- 19.Baes CF, Mesmer RE (1976) The hydrolysis of cations. Wiley, New YorkGoogle Scholar
- 21.McNaught AD, Wilkinson A (1997) IUPAC. Compendium of chemical terminology, 2nd edn. Blackwell Scientific Publications, OxfordGoogle Scholar
- 24.Nordstrom DK (2002) Aqueous redox chemistry and the behavior of iron in acid mine waters. In: Wilkin RT, Ludwig RD, Ford RG (eds) Workshop on Monitoring Oxidation-Reduction Processes for Ground-water Restoration, 2002Google Scholar