文档介绍：274 Christopher C. Fuller et al.
Table IV (continued)
Reaction logP*(/ = 0)^
UO22+ + 3CO32- <^ U02(C03)3^-
3UO22+ + 6CO32- <^ (U02(3(C03)6^"
2UO22+ + CO32- + 3H2O <^ (U02)2C03(OH)3- + 3H+ -
3UO22+ + CO32- 4- 3H2O ^ (U02)3C03(OH)3+ + 3H+
IIUO22+ + 6CO32- + I2H2O <^ (U02)ii(C03)6(OH)i2^- + 12H+
H+ + CO32- ^ HCO3-
2H+ + CO32- <^ H2CO3*
C02(g) + H2O <^ H2CO3 * -
UO22+ + NO3- <^ UO2NO3+
UO22+ + CI- ^ UO2CI+
UO22+ + 2Cr <^ UO2CI2, aq -
UO22+ + SO42- <^ UO2SO4, aq
UO22+ + 2SO42- <^ U02(S04)2^"
SO42- + H+ <^ HSO4- ^
UO22+ + P04^- <^ UO2PO4-
UO22+ + P04^- + H+ <^ UO2HPO4, aq
UO22+ + P04^- + 2H+ <^ UO2H2PO4+
UO22+ + P04^- + 3H+ <^ UO2H3PO42+
UO22+ + 2P04^- + 4H+ <^ U02(H2P04)2, aq
UO22+ + 2P04^- + 5H+ ^ U02(H2P04)(H3P04)+
P04^- + H+ <^ HPO42- ^
P04^- + 2H+ <^ H2PO4- ^
P04^- + 3H+ <^ H3P04,aq ^
Values from Grenthe et al. (1992) unless indicated otherwise.
Values are for zero ionic strength.
""Values from Silva (1992).
Values from Sandino and Bruno (1992).
^Values from Silva et al (1995).
HA samples with > 10,000 ppm sorbed U(VI) with chernikovite identified
(Fuller et al, 2002a). In batch sorption samples with sorbed concentrations
<4700 ppm U(VI), the log IAPCHN was < -58, consistent with the conclusion
from the fits to EXAFS spectra that plexation effectively -
peted the precipitation of chernikovite. In these samples, the initial dissolved
uranium concentrations (> 7600 |ULg/Hter) resulted in log IAPCHN > —52,
indicating that the initial conditions greatly exceeded chernikovite solubility,
but precipitation was not observed.
9. Evaluation of Apatite Materials 275
The U(VI) sorption processes by bone meal and bone charcoal were also
determined using XAS and XRD data (Fuller et al., 2002b). The U-Lm X-ray
absorption edge positions and XANES s