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Table 4 The measured Kds (average ± standard deviation for triplicates) of each radionuclide onto four different aquifers under five different redox conditions

From: Effect of reducing groundwater on the retardation of redox-sensitive radionuclides

A. Distribution coefficients (K d , mL/g) for radionuclides sorbed to alluvium in synthetic J-13 water
Test ID Test Condition Sr Tc-99 I Cs Re Np-237 U Pu-242
A atm 50.4 ± 1.65 (-0.099) ± 0.064 0.74 ± 0.02 2078 ± 304 (-0.20) ± 0.07 52.3 ± 4.40 23.9 ± 1.93 437 ± 147
B 1% O2 50.6 ± 0.54 (-0.052) ± 0.035 0.35 ± 0.09 2275 ± 415 (-0.03) ± 0.05 77.4 ± 2.48 1022 ± 114 520 ± 188
C 0.1% O2 54.5 ± 1.41 (-0.097) ± 0.009 0.50 ± 0.18 2439 ± 363 (-0.28) ± 0.26 85.1 ± 1.83 782 ± 7.06 376 ± 62.5
D 11 ppm FeCl2 56.6 ± 9.65 (-0.255) ± 0.107 0.99 ± 0.82 2617 ± 475 0.014 ± 0.44 91.0 ± 7.15 1155 ± 490 518 ± 436
E 24 ppm Na2S 50.6 ± 0.52 0.114 ± 0.019 0.56 ± 0.25 3663 ± 92.4 0.44 ± 0.05 93.8 ± 2.83 182 ± 70.4 342 ± 277
B. Distribution coefficient ( K d , mL/g) for radionuclides sorbed to devitrified tuff in synthetic J-13 water
Test ID Test Condition Sr Tc-99 I Cs Re Np-237 U Pu-242
A atm 26.0 ± 2.60 1.22 ± 0.62 0.43 ± 0.83 79.6 ± 9.35 0.20 ± 0.48 4.55 ± 0.75 6.64 ± 0.35 164 ± 83.4
B 1% O2 26.5 ± 0.77 2.10 ± 1.00 0.49 ± 0.20 89.6 ± 6.65 0.15 ± 0.029 20.9 ± 6.34 226 ± 68.2 168 ± 149
C 0.1% O2 30.2 ± 0.38 12.5 ± 4.41 0.64 ± 0.12 96.1 ± 4.00 0.020 ± 0.025 36.5 ± 8.40 89.4 ± 6.93 798 ± 70.6
D 11 ppm FeCl2 27.7 ± 1.16 19.1 ± 11.4 0.90 ± 0.38 99.5 ± 6.40 0.263 ± 0.245 69.6 ± 30.7 139 ± 34.7 (-83.5) ± 56.5
E 24 ppm Na2S 25.4 ± 0.92 378 ± 98.0 0.61 ± 0.13 105 ± 6.08 0.56 ± 0.29 930 ± 462 268 ± 42.6 15.2 ± 81.7
C. Distribution coefficients ( K d , mL/g) for radionuclides sorbed to carbonate rock in synthetic LCA water
Test ID Test Condition Sr Tc-99 I Cs Re Np-237 U Pu-242
A atm 0.96 ± 0.32 0.24 ± 0.12 0.72 ± 0.03 0.33 ± 0.11 0.012 ± 0.092 255 ± 39.1 2.22 ± 0.63 116 ± 8.00
B 1% O2 0.50 ± 0.07 0.12 ± 0.16 (-0.11) ± 0.01 0.19 ± 0.12 (-0.11) ± 0.05 228 ± 16.1 2.96 ± 0.28 162 ± 12.6
C 0.1% O2 0.98 ± 0.12 0.38 ± 0.08 0.39 ± 0.29 0.37 ± 0.07 0.23 ± 0.07 314 ± 36.5 3.31 ± 0.14 156 ± 27.6
D 11 ppm FeCl2 1.37 ± 0.39 0.81 ± 0.45 0.52 ± 0.35 0.67 ± 0.45 0.32 ± 0.35 402 ± 55.1 (-3.93) ± 0.03 0.13 ± 198
E 24 ppm Na2S 0.89 ± 0.39 0.41 ± 0.33 0.38 ± 0.35 0.28 ± 0.33 (-0.07) ± 0.31 440 ± 18.1 (-2.60) ± 0.10 (-0.14) ± 0.50
D. Distribution coefficients ( K d , mL/g) for radionuclides sorbed to to zeolitic tuff in TCU water
Test ID Test Condition Sr Tc-99 I Cs Re Np-237 U Pu-242
A atm 1080 ± 350 0.28 ± 0.11 (-0.70) ± 0.12 278 ± 76.6 (-0.14) ± 0.21 2.21 ± 0.35 1.79 ± 0.30 25.1 ± 2.04
B 1% O2 2637 ± 932 0.19 ± 0.01 0.79 ± 0.39 1164 ± 306 0.049 ± 0.039 2.07 ± 0.10 1.37 ± 0.34 65.3 ± 17.0
C 0.1% O2 1587 ± 382 0.045 ± 0.022 0.17 ± 0.20 1065 ± 183 (-0.069) ± 0.029 2.31 ± 0.20 4.12 ± 0.09 66.8 ± 7.61
D 11 ppm FeCl2 14264 ± 12586 0.11 ± 0.032 0.07 ± 0.71 16762 ± 15951 (-0.039) ± 0.057 0.74 ± 0.083 7.25 ± 0.56 61.0 ± 46.0
E 24 ppm Na2S 1019 ± 612 0.61 ± 0.10 0.70 ± 0.14 1790 ± 2208 0.64 ± 0.88 3.93 ± 1.64 8.21 ± 2.53 30.0 ± 98.7