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

Table 6

Parameter values obtained by fitting the effective diffusion coefficient versus molecular size by the exponential expression (14). The numbers in the top line are taken from Jacops et al. [23]. is calculated from expression (18) and is calculated from expression (11). From the fitted value, the hydraulic conductivity is calculated and compared to the experimental value .

Water
			(m^2/s)	(m^−1)
			Code
	(-)	(m^2/s)		(m^−1)	( )	(m)	(m)	(m/s)	(m/s)
K2	⊥	0.4		8.7E + 09 ± 3.0E + 09	11.1	−1.53E − 07				0.0002
K4	//	0.38			3.7					0.92
K14	//	0.37		6.4E + 09 ± 1.9E + 09	8.4	−1.91E − 09				212
K15	//	0.4		6.9E + 09 ± 2.0E + 09	6.4	−2.51E − 09				28
K16		0.41		6.6E + 09 ± 2.7E + 09	8.0	−2.08E − 09				4397
K17	⊥	0.4		8.2E + 09 ± 2.2E + 09	5.9	−8.21E − 09				10.1
Bent 1.4		0.47			4.0					0.31
Bent 1.6		0.4			0.5					0.76
COX 1	⊥	0.18			4.3					3.4
OPA 1	⊥	0.096		±	55.0					0.010