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Fig. 1. Data obtained with the ion-selective electrode for titrations of humic acid (HA), fulvic acid (FA), 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 with Cd(ClO4)2 at pH 7. The x axis intercept of the regression line with a unity slope is defined as the complexing capacity (CC) for Cd of the respective ligand. Data shown were obtained from triplicated separate titrations for each ligand. CdF, free (ionic) cadmium.
