Fig. 4. Incremental stability constants (pK_i) for Cd binding by humic acid (HA), fulvic acid after dialysis with a molecular weight cutoff of 1000 Da (FA > 1000), FA, and dissolved organic matter (DOM) fractions (HoA, HoN, HiA, HiN, and HiB) from municipal solid waste (MSW) compost at pH 7. The pK_i data were obtained by calculating the slope of adjacent points in the Scatchard plot representation (/Cd_F vs. , where Cd_F is free [ionic] cadmium) of the titration data. The scale of ' varies in accordance with the total complexing capacity (CC) of each ligand (the maximum value of ' corresponds to 100% CC). Three titrations were performed for each ligand except for HiA (1). The data shown were obtained from triplicated separate titrations for each ligand.

Return to article