Aldaba D, Fernández-Torrent R, Rauret G, Vidal M, Rigol A
Departament de Química Analítica, Universitat de Barcelona, Barcelona, Spain.
Appl Radiat Isot. 2010 Mar;68(3):393-8. doi: 10.1016/j.apradiso.2009.11.029. Epub 2009 Nov 22.
Diffusion transport of (36)Cl was examined in seven soils under unsaturated conditions in tubes packed with two portions of each soil having different (36)Cl activity concentrations. Apparent diffusion coefficients (D(a)) derived from diffusion profiles varied within a narrow range (from 3x10(-10) to 7x10(-10) m(2) s(-1)) confirming the minor effect of soil properties on the diffusion of a non-reactive radionuclide like (36)Cl. Instead, packing conditions had a major effect. Solid-liquid distribution coefficients (K(d)) derived from D(a) (0.02-0.2 L kg(-1)) were systematically lower than those obtained from batch experiments (0.6-1.0 L kg(-1)), but with a similar variation pattern among soils. The low values of K(d) (Cl) confirmed an almost negligible radiochloride-soil interaction.
在装有两份具有不同³⁶Cl活度浓度的每种土壤的试管中，研究了七种土壤在非饱和条件下³⁶Cl的扩散传输。从扩散剖面得出的表观扩散系数（D(a)）在狭窄范围内变化（从3×10⁻¹⁰到7×10⁻¹⁰ m² s⁻¹），证实了土壤性质对像³⁶Cl这样的非反应性放射性核素扩散的微小影响。相反，填充条件有主要影响。从D(a)得出的固液分配系数（K(d)）（0.02 - 0.2 L kg⁻¹）系统地低于从批量实验获得的值（0.6 - 1.0 L kg⁻¹），但在不同土壤间具有相似的变化模式。K(d)(Cl)的低值证实了放射性氯化物与土壤之间的相互作用几乎可以忽略不计。
