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 137Cs and 85Sr, 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 cm2 h−1. <alternatives> [...] </alternatives>
 P. Franta et al., In: B.J. Merkel, A. Hasche-Berger (Eds.), Some approaches to the study of contamination in the fucoid sandstone at Stráž pod Ralskem site - Northern Bohemia, Czech Republic Uranium Mining and Hydrogeology (Springer-Verlag, Berlin Heidelberg 2008) 71
 T. Pačes et al., In: W.M. Edmunds, P. Shand (Eds.), The Cenomanian and Turonian Aquifers of the Bohemian Cretaceous Basin, Czech Republic, Natural Groundwater Quality (Blackwell Publishing, Malden-Oxford-Victoria, 2008)
 C.G.J. Appello, D. Postma, Geochemistry, groundwater and pollution (Balkema, Rotterdam, 1993) 535
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