Development of an Extractive Spectrophotometric Method for the Determination of Copper(II) in Leafy Vegetable and Pharmaceutical Samples Using 2–acetylpyridine 4–phenyl –3-thiosemicarbazone (APPT). mejs [Internet]. 2024 Mar. 14 [cited 2024 Sep. 16];4(2):70-83. Available from: https://journal.mu.edu.et/index.php/mejs/article/view/120