Selective and Simultaneous Solid Phase Extraction of Polar and Non–Polar Organophosphorus Pesticides Using Sol–Gel Hybrid Silica–Based Sorbent. J. Teknol. [Internet]. 2013 May 15 [cited 2026 Sep. 13];62(3). Available from: https://journals.utm.my/jurnalteknologi/article/view/1893