Abstract
The sorption of Sr in 21 natural sediment-groundwater systems from Gorleben, F.R.G., has been modeled using a simple surface complexation model. An apparent constant of Sr sorption has been computed taking into account bulk cation-exchange capacity of the sediment, the analytical composition of groundwater and experimental sorption data obtained from related systems. The method of determining the prevailing surface complex has been described in detail, using changing properties of the natural systems. Apparent sorption constants of natural groundwater components — Ca 2+, Mg 2+, K + and Na + — have been estimated. Competition from natural groundwater components for sorption sites has been taken into account. The main parameters governing Sr 2+ sorption are cation-exchange capacity of the sediment and ionic strength of the groundwater. The model describes the influence of experimental volume to mass ratio and of Sr 2+ concentration on sorption and allows one to compare the varying sorption data of similar systems. Computations were performed using the geochemical code MINEQL.
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