Evaluation of ligand properties of the Bormida and Po river sediments by potentiometric acid-base titrations

The acid-base and ligand properties of two river sediments (the Bormida riv er and the Po river) were investigated by means of alkalimetric titrations performed on suspensions containing different sediment weights suspended in an acidic solution at controlled ionic strength (0.01, 0.1 and 1 M). In or der to investigate the sediments composition, FT/IR and diffractometric spe ctra were registered for the dry sediments and trace metal content and elem ental compositions were determined. For both the sediments considered, by e laborating the potentiometric data it was possible to propose models that e xplain the trend of the experimental values better for both proton-sediment and sediment-copper(II) systems.