Development of a Pre-concentration Method for Nickel in Chocolate Samples using Magnetic Dispersive Solid- phase Extraction Followed by Flame Atomic Absorption Spectrometry

Department of Chemistry,Central Tehran Branch, Islamic Azad University, Tehran, Iran

Department of Chemistry,Central Tehran Branch, Islamic Azad University, Tehran, Iran

Department of Chemistry,Central Tehran Branch, Islamic Azad University, Tehran, Iran

Department of Chemistry, Islamic Azad University, North Tehran Branch, Tehran, Iran