Spectrophotometric Determination of Co(II) in Vitamin B12 Using 2-(biphenyl-4-yl)-3-((2-(2,4-dinitrophenyl) hydrazono)methyl) imidazo [1,2-a]pyridine as Ligand by Flow Injection–Merging Zone Analysis. (2020). Al-Nahrain Journal of Science, 23(3), 24-38. https://mail.anjs.edu.iq/index.php/anjs/article/view/2309