Ebrahim S, Alhares H. Competitive Removal of Cu2+, Cd2+and Ni2+by Iron Oxide Nanoparticle (Fe3O4). Eng. J. [انترنت]. 12015 [وثق 302019];21(4):98-22. Available from: http://joe.uobaghdad.edu.iq/index.php/main/article/view/445