This research firstly aimed to study the potential of electrokinetics (EK) on arsenic (As) mobility in gelatin (agar) medium with different containers (spherical or rectangular), electrodes (graphite or stainless-steel grade 316L), and applied electric field (0, 1, and 2 V cm− 1) by dividing the area into nine parts to ascertain the As movement (horizontally and vertically) after 72 h. Secondly, utilizing the optimal conditions for As mobility from the first part, to ascertain the effect of EK

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... ith Mott Dwarf Napier Grass (Pennisetum purpureum cv. Mott) for the co-treatment of mine tailings at an applied electric field of 0, 1, 2, and 4 V cm− 1 to examine the As accumulation in the plants and mine tailings after 15, 30, 45, 60, 75, 90, 105, and 120 d. The results showed that As had the highest mobility in agar in the spherical container using graphite electrodes with an applied electric field of 2 V cm− 1. The areas around the cathodes had lower As levels than that around the anode, with a net movement from cathode to anode areas both horizontally and vertically. For the co-treatment of mine tailings with EK and P. purpureum cv. Mott cultivation, the applied electric field provided better As treatment results than without an electric field, and the plants accumulated As in their roots to a greater extent than in the stem and leaves. The highest As absorption capability in the roots of P. purpureum cv. Mott (7.69 ± 0.16 mg kg− 1) was obtained after 90 d with an applied electric field of 1 V cm− 1.