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In order to elucidate the environmental problems arising from the mobility enhancement of metallic contaminants due to the presence of humic acid (HA) in water, transport and retention experiments of HA, in the presence and in the absence of divalent ions Me 2+ (Ca 2+ , Cu 2+ and Pb 2+ ), through natural quartz sand (NQS) porous medium, were carried out. The breakthrough...
The surface charge of humic acid under different conditions of ionic strength, pH, and the presence of various cationic ions (Cu 2+ , Zn 2+ , Ba 2+ , and Ca 2+ ) was determined by a titration method using a cationic polyelectrolyte as titrant. Adsorption isotherms in batch experiments of the polymer from water onto quartz sand were determined at 20°C, 40°C, and 60°C...
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