Interfacial interaction properties are related to the surface properties of sediment particles. Surface properties and interfacial interactions are modified with the change in water environments. Experiments of surface pore characteristics and copper adsorption were performed to analyze the interfacial interaction of cleaned sediments and the original state sediments with the change of water environments. Physical and chemical adsorption apparatus was adapted to measure surface morphology characteristics of sediment particles. The experimental results reveal that cleaned sediments have richer surface pore structures and more complex surface topography. In copper ions adsorption experiments

saturated adsorption capacities of cleaned and original sediments are 0.854g/kg

4.525g/kg

and adsorption/desorption ratios are 1.511 and 5.652

respectively. Original sediments have stronger ability of interfacial interaction than cleaned sediments. Contaminations are adsorbed to particle surfaces

which results in the change of the surface morphology of particles. Biomenbrane and humus adhered to the particles' surface enhance the interaction ability. With the change in water environments

interfacial interaction of sediment transformed from physical adsorption to chemical adsorption.