The Electronic Transition Behavior Cr (III), Fe (III), Fe (II) and Ni (II), Transition Metal Cations In Ammonium Alum-Urea Room Temperature Ionic Liquid. ANJS [Internet]. 2013 Sep. 1 [cited 2024 May 2];16(3):46-55. Available from: https://anjs.edu.iq/index.php/anjs/article/view/576