Effect of Water Saturation on the Diffusion/Adsorption of ²²Na and Cesium onto the Callovo-Oxfordian Claystones

Table 3

Values of distribution coefficient (K_D) and effective diffusion coefficient (D_e) for the in-diffusion until equilibrium of ²²Na and cesium for various imposed suction values on intact and compacted materials. Values between brackets indicate the uncertainty ranges.

Sample state	Species	Saturation degree (%)	KD (mL g^−1)	(m^2 s^−1)	[Cs] at the end of experiment (mmol L^−1 of pure water)
Intact	^22Na^+	81	1.05 (0.70–1.30)
Compacted	^22Na^+	100	0.60 (0.50–0.8)	13.0 (8.0–30.0)
Compacted	^22Na^+	81	0.85 (0.50–1.00)
Compacted	^22Na^+	75.5	0.76 (0.55–0.95)
Compacted	^22Na^+	70	0.63 (0.30–0.75)
Intact	^134Cs + [Cs]	100	21 (18–25)	18 (15–20)
Intact	^134Cs + [Cs]	81	11 (7–16)
Compacted	^134Cs + [Cs]	100	27 (25–32)	70 (30–200)
Compacted	^134Cs + [Cs]	81	20 (17–28)
Compacted	^134Cs + [Cs]	75.5	14.5 (12–22)
Compacted	^134Cs + [Cs]	70	8.1 (5–11)