فهرس المقالات Pre-concentration حرية الوصول المقاله صفحة الملخص نص كامل 1 - Pre-concentration and Determination of Low-traces of Copper Ions in Different Mediums Using Dispersive Liquid-liquid Micro-extraction (DLLME) Davood Kaviani Mohammad Hossein Bigtan Majid Saghi حرية الوصول المقاله صفحة الملخص نص كامل 2 - On-line Pre-Concentration and Separation of Inorganic Arsenic Based on Nano Platinum-Multiwall Carbon Nanotubes Hamid Shirkhanloo Ali Akbar Miran Beigi Amir Vahid Nasrin Shirkhanloo Behzad Kalantri Hossein Ali Ghadirian 10.22034/jna.2014.02.001 حرية الوصول المقاله صفحة الملخص نص كامل 3 - Solid Phase Extraction of Trace Copper in Aqueous Samples Using C18 Membrane Disks Modified by Benzildithiosemicarbazone Prior to Flame Atomic Absorption Spectrometric (FAAS) Determination M. Mohammadhosseini 10.22034/jchr.2018.544025