Continuous Flow Injection Analysis for The Photometric Determination of Metformin Drug Via The Release of Copper(II) ion from Charged Gel Bead Crystal. Iraqi Journal of Science [Internet]. 2023 Dec. 30 [cited 2024 Dec. 24];54(1):17-26. Available from: https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/12014