Skip to main content

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