Abstract
The solubilities of NpO2(s) in the KURT (KAERI Underground Research Tunnel) granitic groundwater with low ionic strength were measured experimentally and calculated by a geochemical code. Then these results were compared with each other as well as with foreign results. The concentrations of neptunium were measured as 6·10−8−2·10−8 mol/L at a pH = 9.5–11.1 and Eh = −0.2 V, and less than 5·10−9 mol/L at a pH = 11.8–13.0 and Eh = −0.3–0.44 V. The dominant aqueous species were presumed as Np(OH)x(CO3)y 4−x−2y complexes and Np(OH)4(aq) at pH = 9.5–13 under the Eh<−0.2 V reducing condition.
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I. G. Mckinley, W. R. Alexander, A. Gautschil, N. Waber, Radiochim. Acta, 82 (1998) 407.
Seung Soo Kim, Min Hoon Baik, Kwang Cheol Kang, Soo Han Kwon, Jong Won Choi, J. Ind. Eng. Chem., 14 (2008) 739.
G. R. Choppin, Marine Chemistry, 99 (2006) 83.
W. Hummel, U. Berner, E. Curti, F. J. Pearson, T. Thoenen, Nagra/PSI Chemical Thermodynamic Data base 01/01, Universal Publishers, Florida, USA, 2002.
J. P. Kaszuba, W. H. Runde, Environ. Sci. Technol., 33 (1999) 4427.
M. D. Siegel, C. R. Bryan, 9.06 Environmental Geochemistry of Radioactive Contamination, in Vol. 9, Environmental Geochemistry, Treatise on Geochemistry, H. D. Holland, K. K. Turekian (Eds), Sandia National Laboratories, Elsevier, 2004, p. 234.
D. L. Parkhurst, C. A. J. Appelo, User’s guide to PHREEQC (Version 2) — a computer program for speciation, batch-reaction, one-dimensional transport and inverse geochemical calculations, Water-Resources Investigations Report 99-4259, Denver, Colorado, 1999.
J. A. Porter, Precipitation of neptunium oxalate and calcination to neptunium oxide, DP-591, Savannah River Laboratory, 1961.
F. J. Mompean, M. Illemassene, C. Domenech-Orti, K. B. Said, Chemical Thermodynamics 5: Update on the Chemical Thermodynamics of Uranium, Neptunium, Plutonium, Americium and Technetium, Elsevier, Amsterdam, 2003.
D. K. Keum, M. H. Baik, P. S. Hahn, J. Korean Nucl. Soc., 43(5) (2002) 517.
JNC, DATABASE Version: 011213c2.tdb, Waste Isolation Research Division, Waste Management and Fuel Cycle Research Center, Tokai Works, Copyright 2003–2004.
V. Neck, J. I. Kim, Radiochim. Acta, 89 (2001) 1.
S. Takeda, S. Shima, H. Kimura, H. Matsuzuru, The aqueous solubility and speciation analysis for uranium, neptunium and selenium by the geochemical code (EQ3/6), JAERI Research 95-069, Japan Atomic Energy Research Institute, 1995.
D. Rai, N. J. Hess, A. R. Felmy, D. A. Moore, M. Yui, Radiochim. Acta, 84 (1999) 159.
A. Kitamura, Y. Kohara, Solubility of Np(IV) under carbonate conditions, Report JNC TC8400 2001-006, Tokai Works, Japan Nuclear Fuel Cycle Development Institute, Muramatsu, 2001.
V. Neck, J. I. Kim, Thermodynamics of tetravalent actinides: a critical assessment of uncertainties, Proc. of Acitinides Conf., Hajiyama, Japan, 2001.
T. E. Eriksen, P. Ndalamba, D. Cui, J. Bruno, M. Caceci, K. Spahiu, Solubility of the redox-sensitive radionuclides 99Tc and 237Np under reducing conditions in neutral to alkaline solutions; effect of carbonate, SKB-TR-93-18, SKB, Stockholm, 1993.
D. Rai, J. L. Ryan, Inorg. Chem., 24(3) (1985) 247.
Y. Inagaki, H. Furuya, K. Idemitsu, T. Arima, H. Osako, T. Banba, T. Maeda, S. Matsumoto, I. Nomura, S. Kikkawa, M. Saito, H. Okamoto, J. Nucl. Mater., 298(1–2) (2001) 168.
M. Yui, J. Nucl. Mater., 298 (2001) 134.
M. Altmaier, V. Neck, R. Muller, Th. Fanghanel, Radiochim. Acta, 93 (2005) 83.
B. Wierczinski, S. Helfer, M. Ochs, G. Skarnemark, J. Alloy and Compounds, 271 (1998) 272.
J. H. Rees, J. Nucl. Mater., 130 (1985) 336.
I. G. Mckinley, D. Savage, J. Contaminant Hydrology, 21 (1996) 335.
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Kim, S.S., Baik, M.H. & Kang, K.C. Solubility of neptunium oxide in the KURT (KAERI Underground Research Tunnel) groundwater. J Radioanal Nucl Chem 280, 577–583 (2009). https://doi.org/10.1007/s10967-009-7481-y
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DOI: https://doi.org/10.1007/s10967-009-7481-y