Fig. 5. (a) pH measured in the leachate of the first column experiment; (b–f) cumulative amounts of dissolved organic carbon (DOC), Na, Ca, Zn, and Cd leached from the columns. 
, no additives; 
, 0.3% Ca(OH)2; 
, 0.5% zeolite A; 
, 2.5% zeolite A.
Fig. 5. (a) pH measured in the leachate of the first column experiment; (b–f) cumulative amounts of dissolved organic carbon (DOC), Na, Ca, Zn, and Cd leached from the columns. , no additives; , 0.3% Ca(OH)2; , 0.5% zeolite A; , 2.5% zeolite A.