Figure 9From: Aggregation of montmorillonite and organic matter in aqueous media containing artificial seawaterThe ζ-potential of humic acid (HA) suspension as a function of pH at two discrete salinity values. At zero salinity, ζ-potential is independent of pH and highly negative, indicative of electrostatically stable colloidal suspension. At a higher salinity, ζ-potential is less negative but still at ΦZ ≈ -20 mV.Back to article page