Fig. 2. Changes in solution concentration vs. time. (a) 1.98 mM desferrioxamine B (DFOB) and 2.04 mM the ferric complex of DFOB (FOB) with Ca-montmorillonite (results with Na-montmorillonite exhibited similar relations between DFOB and FOB). (b) FOB with Ca- and Na-montmorillonite. Experimental conditions: two replicates; 5 g L–1 clay minerals; pH 7.5; I = 0.01 M (KClO4).