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. ANJS [Internet]. 2020 Sep. 26 [cited 2024 Apr. 28];23(3):24-38. Available from: https://anjs.edu.iq/index.php/anjs/article/view/2309