Detection of Methamphetamine using Nanobentonite as a Novel Solid Phase Extraction Column Matrix Assisted with Gas Chromatography- Mass Spectroscopy. Baghdad Sci.J [Internet]. 2022 Aug. 1 [cited 2024 Nov. 22];19(4):0816. Available from: https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/5571