Fig. 3. Relative release rates (ri, rel) vs. pH for Cd (a), Cu (b), and Pb (c). D1 
, D2 •, T1 
, and T2 
, where D is Danish and T is Thai. Relative release rates are calculated by use of Eq. [5]. Solid lines are drawn as a guide to the eye.
Fig. 3. Relative release rates (ri, rel) vs. pH for Cd (a), Cu (b), and Pb (c). D1 , D2 •, T1 , and T2 , where D is Danish and T is Thai. Relative release rates are calculated by use of Eq. [5]. Solid lines are drawn as a guide to the eye.