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The knowledge of surface properties of soil mobile colloids is of great importance to predict their role, but these properties are difficult to assess due to the heterogeneity and the complex nature of natural colloids. Physico-chemical features of natural colloids circulating in the soil solution were investigated with complementary approaches: microscopic techniques (TEM and AFM), potentiometric...
In order to assess the importance of colloids in the metal transfer in soils under varying land use (a podzol under a forest, a cultivated luvisol and a luvisol under a metallophyte grassland), gravitational waters were collected in situ by zero-tension lysimeters. Dissolved and colloidal fractions of metals were separated by ultracentrifugation and colloids were studied by transmission electron microscopy...
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