Abstract
Adsorption characteristics of atrazine (AT) onto the surfacial sediments (natural surface coating samples) were investigated via thermal adsorption in the presence of pollutants malathion (Ma) and heavy metals (cadmium and copper). The results indicate that cadmium and Ma both have synergetic effect during the adsorption of AT; at the same time, copper caused antagonistic effect on the adsorption of AT. Ma could facilitate the adsorption of AT, no matter that Ma was added after the adsorption of AT or simultaneous adsorption of AT with Ma present. However, Ma inhibited the adsorption of AT when it was added before the adsorption of AT. The adsorption of AT was also enhanced when both cadmium and Ma were present; however, it was inhibited strongly when both copper and Ma were present. The infrared spectra of the surfacial sediments (natural surface coating samples), after the adsorption of AT in the presence of co-existing pollutants, indicated that organic functional groups, such as O-H or N-H and C=O, play important roles on sorption of AT to river sediments.
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