Studies On The Adsorption Mechanism Medols Of Heavy Metals And Herbicide Onto Main Components In Surficial Sediments

To quantitify the adsorption effect of components in surficial sediments (SSs) and natural surface coating samples (NSCSs) when they absorbing heavy metal [Cu, Zn (without and with the present of Cu)] and atrazine (AT), Multiple Regression Adsorption Models (MRAMs) were developed in this study. The MRAMs improve upon previous additional adsorption models (AAMs) with superior goodness-of-fit tests (R2=ca.1), F-tests, and t-tests (p< 0.05); they also revealed the importance of considering interactions, neglected by AAMs, among the SSs and NSCSs components when estimating the adsorptions of Zn and Cu. We verified the results of the MRAMs through adsorption experiments, with relative deviations of less than 15% between the maximum adsorptions of Zn and Cu predicted by the MRAMs and the experimentally obtained values.Our results of Cu-MRAM and Zn-MRAM indicate the significant effect of interaction between components and highlight the significant contributions made by Fe and Mn oxides in controlling the mobilization of heavy metals in aquatic environments. By applying Zu(Cu)-MRAM, it was estimated that the interaction effect among components to the adsorption of Zn varies greatly after the addition of Cu, and also highlighted the importance of Fe and Mn in controlling the behavior of Zn in water. The resulted information of AT-MRAM shows that Mn is prone to interact with other non-residual components, the total maximum AT adsorption is inversly proportional to the levels of Mn, and Fe and OMs facilitate the adsorption of AT revealing significant contribution of the interactions among non-residual components in controlling the behavior of AT in aquatic environments.