The Dependency of Diffusion Coefficients and Geometric Factor on the Size of the Diffusing Molecule: Observations for Different Clay-Based Materials

Table 4

Overview of measured hydraulic conductivity and diffusion coefficients and the uncertainty on the fit (95% confidence interval).

Kinetic diameter; D0 ( m^2/s)

He

HTO

Ne

H2

Ar

CH4

Xe

C2H6

2.58

2.75

2.79

2.97

3.42

3.82

4.06

4.42

7.28

2.20

4.03

5.11

2.44

1.84

1.47

1.38

Core

Code

K

(m/s)

(-)

BC 84b

K2

⊥

0.4

NM

BC 127b

K4

//

0.38

BC 36a

K14

//

0.37

NM

NM

NM

BC 37b

K15

//

0.40

NM

NM

NM

BC 35b

K16

⊥

0.41

NM

NM

NM

BC 39b

K17

⊥

0.40

NM

NM

NM

Bent 1.4

Bent 1.4

0.47

NM

NM

NM

Bent 1.6

Bent 1.6

0.40

NM

NM

NM

COX 1

COX 1

⊥

NM

NM

NM

OPA 1

OPA 1

⊥

0.096

NM

measured porosity for the COX sample is 0.16. However, for compatibility reasons, the reference value of 0.18 is taken as this value has also been used in Jacops et al. [22]; NM indicates that a gas was “not measured,” while F indicates a “failed” experiment.