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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