CATION EXCHANGE CAPACITY, SELECTIVITY AND THE SORPTION COEFFICIENTS OF THE WATER BEARING SOIL MATERIALS AT INSHAS SITE IN EGYPT

摘要

The main source of drinking water in Egypt is the river Nile. Ismailia canal isconsidered as a part of the river Nile which is a fresh water way , it is adjacent to theAtomic Research Center at Inshas site . The canal water may pass through the soil layersand contribute to the groundwater.For safety performance assessment of Inshas site, the interaction of dissolvedradionuclides in the aqueous phase with the water bearing layer soil materials is veryimportant . The present work dealing with sorption experiments which carried out onnatural soil samples at different depths to more than 40 m down the surface of theground . The soil materials was assumed as a weak cation exchange medium, theinteraction of Cs-134 nuclide dissolved in the aqueous phase with natural soil sampleswas studied. The Cation Exchange Capacity (CEC) for natural soil samples wascalculated using ammonia method . Selectivity coefficients of , Na-K, Na-Ca, Ca-K, andMg-Ca for the exchangeable cations of Na, K, Mg and Ca were calculated. Na wasfound to be the domain cation in the aqueous phase followed by Ca, Mg, and K..Sorption coefficients (Rd) of the soil samples was studied at different Cs ionconcentrations(0.0001,0.0005,0.005,0.001,and 0.01 mol/l). The Rd values were calculated for the soilsamples from the selectivity coefficients measurements. The calculated values werecompared with the results obtained experimentally. The resulting data indicated that, thecalculated Rd values from selectivity calculations are in a good agreement with theexperimental laboratory measurements.