Most existing in-lake methods used to minimize the remobilization of redox-sensitive compounds from sediments are costly and limited in their effectiveness. Therefore, new approaches for this problem are needed. We describe electrochemically initiated transformation processes of iron and manganese, resulting in their immobilization in the sediment. This process could possibly be applied to prevent remobilization of phosphate from lake sediments. With electrodes positioned 3 cm in the sediment and 7 cm above the sediment-water interface, an electrochemically controlled redox- and pH-"barrier" was constructed. By means of laboratory experiments in columns filled with sediment and water from a reservoir, we demonstrated the possibility to fix and concentrate Fe and Mn under specific conditions in the sediment, or if required, to mobilize and drain them in concentrated solution. The behaviors of these metals were studied by simultaneous measurements of their concentrations, pH-, E_h-values, and O₂- concentration at the interface and in the water with and without current influence. The results show that soluble species can be transported and concentrated in an electric field. Iron and manganese can be prevented from being released from the sediments by sustainable in-situ fixation.