Determination of Cs-137 and Sr-85 transport parameters in fucoidic sand columns and groundwater system

作者：Palagyi Stefan^*; Stamberg Karel

来源：Central European Journal of Chemistry, 2011, 9(5): 798-807.

DOI：10.2478/s11532-011-0076-9

• Sorption and desorption
• Linear and non-linear isotherms
• Dynamic flow
• Breakthrough curves

The determination is based on the evaluation of experimentally obtained breakthrough curves using the erfc-function. The first method is founded on the assumption of a reversible linear sorption/desorption isotherm of radionuclides on solid phase with constant distribution and retardation coefficients, whereas the second one is based on the assumption of a reversible non-linear sorption/desorption isotherm described with the Freundlich equation, i.e., with non-constant distribution and retardation coefficients. Undisturbed cores of 5 cm in diameter and 10 cm long were embedded in the Eprosin-type cured epoxide resin column. In this study the so-called Cenomanian background groundwater was used as transport medium. The groundwater containing radionuclides was introduced at the bottom of the columns at about 4 mL h(-1) constant flow-rate. The results have shown that in the investigated fucoidic sands: (i) the sorption was in principle characterized by linear isotherms and the corresponding retardation coefficients of Cs-137 and Sr-85, depending on the type of sample, were approximately 13 or 44 and 5 or 15, respectively; (ii) the desorption was characterized by non-linear isotherms, and the retardation coefficients of the same radionuclides ranged between 23-50 and 5-25, respectively. The values of the hydrodynamic dispersion coefficients of these radionuclides varied between 0.43-1.2 cm(2) h(-1).

• 出版日期2011-10