Fig. 8. Free ionic concentrations of (a) Ca, (b) Zn, and (c) Cd based upon speciation calculations in the column leachates. 
, no additives; 
, 0.1% Ca(OH)2; +, 0.5% Ca-treated zeolite A; x, 0.5% H-treated zeolite A; –, 0.5% Ca–H-treated zeolite A.
Fig. 8. Free ionic concentrations of (a) Ca, (b) Zn, and (c) Cd based upon speciation calculations in the column leachates. , no additives; , 0.1% Ca(OH)2; +, 0.5% Ca-treated zeolite A; x, 0.5% H-treated zeolite A; –, 0.5% Ca–H-treated zeolite A.