Synthesis And Characterization Of (P-Hydroxybenzoic Acid Urea Formaldehyde) Copolymer Chelates With Pb(II),Zn(II) And Cd(II) Ions. JUBPAS [Internet]. 2018 Jan. 10 [cited 2025 Apr. 19];26(3):99-107. Available from: https://journalofbabylon.com/index.php/JUBPAS/article/view/566