Effect of Organic Acids on Heavy Metal Migration in Clay
有机物对重金属在粘土中吸附行为的影响

The organic acids resulting from the waste degradation process in the landfill and heavy metal ions are chosen as the research model.The adsorption experiments show that the adsorption of pure heavy metal and hexanoic acid by clay increases with an increase of pH and that of humic acid by clay decreases with pH increase.When hexanoic acid and heavy metal ions coexist in the solution,the adsorption of metal ions by clay tends to decrease because of the competitive adsorption of hexanoic acid.However.the presence of humic can enhance the adsorption of heavy metal ions because of its complexation with metal inos after dissociation in acidic condition.