Table 3: Parameters of selective sorption of Sr-90 by OMA

1 January 2000

Notes: OMA 1 pH 5.8-6.4; OMA 2 pH 6.3-6.7. CEC is cation exchange capacity [10]; Kd is the distribution coefficient (ratio of concentration in the soil to the concentration in the soil solution) [10]; αex is the quantity of exchangeable radionuclide sorbed by OMA, which characterizes its fixing ability [6, 20]; αex/CEC is the value that characterizes availability of Sr-90 for plants [24]
Sample OMA mix, by % mass Sr-90 selective sorption parameters
SS HL CSS CEC, mg-eq/kg Kd(90Sr), l/kg αex, % αex/CEC•10-4, kg/mg-eq
OMA 1-1 70 20 10 718 76.3 38.9 5.4
OMA 1-3 60 20 20 664 49.9 34.3 5.2
OMA 1-4 80 10 10 685 64.1 38.2 5.6
OMA 2-3 60 20 20 660 50.2 35.1 5.3



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