List of Articles Fe-[DABCO-PDA] NPs Open Access Article Abstract Page Full-Text 1 - Development of a Pre-concentration Method for Nickel in Chocolate Samples using Magnetic Dispersive Solid- phase Extraction Followed by Flame Atomic Absorption Spectrometry Vahid Mortazavi Nik Elaheh Konoz Alireza Feizbakhsh Amir Abdullah Mehrdad Sharif