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. 2024;4(2):70-83. Accessed September 16, 2024. https://journal.mu.edu.et/index.php/mejs/article/view/120