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Fig. 9. (a) Ethylenediamine di-o-hydroxyphenylacetic acid (EDDHA); (b) FeEDDHA. Calculated charge (bold lines represent the sum of all species bearing the same type of charge–positive, negative or neutral) compared with measured values of adsorption of EDDHA and FeEDDHA to Ca-montmorillonite and Ca-kaolinite (dotted lines) vs. pH. (points for both clay minerals overlap). Experimental conditions: two replicates; 1.0 mM EDDHA or FeEDDHA; 5 g L–1 clay minerals; pH values 4.0, 6.0, 7.5, 9.0; I = 0.01 M (KClO4).
