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Dielectric barrier discharge is low-temperature plasma generated in cases with an dielectric material between the electrodes. The demanding applied task of water treatment is the removal of heavy metal ions, including iron (Fe) and nickel (Ni), ions, from aqueous solutions. The authors of the paper designed a plasma reactor that allows the dielectric-barrier discharge treatment of a solution near the surface of the liquid in the flow-through mode, so that this method can be used for technological purposes. The inf...