Hydrologic Resources Management Program and Underground Test Area Project FY 2000 Progress Report Page: 69 of 156
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decreases under conditions where negatively charged aqueous species dominate, the
speciation data suggests that sorption at intermediate pHs will be suppressed by the
formation of Pu-carbonate species in solution.Table 2. Species used in surface complexation fits.
species
PuOH+3
Pu(OH)2+2
Pu(OH)3+
Pu(OH)4(aq)
Pu(OH)2(CO3)2-2
Pu(CO3)s-'
PuO2CO3
PuO2OH(aq)
PuCO3+2
Pu(C03)2(aq)
Pu(CO3)32
Pu(CO3)4~
Pu(CO3)s->log K
-0.5
-1.66
-4.62
-8.85
-2.76
-16.31
-5.21
-9.73
6.67
9.24
8.11
1.58
-7.15# component # component # component #
-1 H+ 1 H20 1 Pu+
-2 H+ 1 Pu+4 2 H20
-3 H+ 1 Pu+4 3 H20
-4 H+ 1 Pu+4 4 H20
-4 H+ 2 HCO3~ 1 PU+4 2
-5 H+ 5 HCO3~ 1 Pu4
-1 H+ 1 HCO3 1 PuO2+
-1 H+ 1 H20 1 Pu02+
old aqueous Pu(IV)-carbonate species
-1 H+ 1 HCO3I 1 Pu+4
-2 H+ 2 HCO3~ 1 Pu+4
-3 H+ 3 HCO3~ 1 Pu"4
-4 H+ 4 HCO3- 1 Pu+4
-5 H+ 5 HCO,- 1 Pu+4t Data from Triay et al. (1997).
57
component
H20
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Davisson, M. L.; Eaton, G. F.; Hakemi, N. L.; Hudson, G. B.; Hutcheon, I. D.; Lau, C. A. et al. Hydrologic Resources Management Program and Underground Test Area Project FY 2000 Progress Report, report, July 1, 2001; California. (https://digital.library.unt.edu/ark:/67531/metadc1411019/m1/69/?rotate=90: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.