Brucedale clay soil

Figure 2. Isotherms for Na+-Ca2+ exchange on Brucedale clay soil for various TOTCl concentrations (TOTNa and TOTCa varied). EVaX and EVo are the equivalent fractions of Na+ in the exchanger and in the hulk solution, respectively.

This value was assumed on the basis of the high CEC of the Brucedale clay soil (220 pcquiv/g), which indicates that the clay mixture in the soil has properties more like illite (a = 90-130 m2/g, CEC = 200-400 p,equiv/g) than like kaolinite (a = 10-20 m2/g, CEC = 20-60 xequiv/g). The ranges of clay properties are taken from Talibudeen (46). 

Figure 7. Composite isotherm for Na -Ca2 exchange on Brucedale clay soil for various TOTNa and TOTCa concentrations. [Data (representative points shown) are from reference 17.] Curves are Jits obtained with physicochemical ion-...

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