Testing the efficiency of duckweed Lemna spp. in reducing the concentration of zinc and iron from the wastewater when increase biomass. Baghdad Sci.J [Internet]. 2011 Mar. 13 [cited 2024 May 5];8(1):471-7. Available from: https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/2518