Abstract: “Ludwigia octovalvis (Jacq.) P.H. Raven is a terrestrial tropical plant in Malaysia having the ability to uptake and accumulate arsenic in their tissue. The effectiveness of arsenic phytoremediation by L. octovalvis in pilot reed bed system using arsenic spiked sand was conducted to determine the feasibility using this plant in a large scale of phytoremediation. The depth of arsenic spiked sand in a reed bed system was 10 cm with another two fine and medium gravels layer below, each at 10 cm depth. All treatments were carried out without addition of fertilizer, bacteria or aeration. The higher arsenic uptake and accumulation reached 528.5 ± 68.3 mg/kg in leaves of L. octovalvis after 42 days of exposure at arsenic concentration of 39 mg/kg. Based on the translocation factor (TF) and bioaccumulation factor (BF) values, indicating phytoextraction has role process in arsenic phytoremediation using L. octovalvis in a pilot reed bed system using spiked sand. The effectiveness of arsenic phyt”

Keywords: arsenic, uptake, accumulation, performance, pilot reed bed, effectiveness.