Shabany, M.; Shabani, A. M. H.; Dadfarnia, S.; Gorji, A.; Ahmadi, S. H. Solid Phase Extraction of Zinc With Octadecyl Silica Membrane Disks Modified by N,N’-Disalicylidene-1,2-Phenylendiamine and Determination by Flame Atomic Absorption Spectrometry. Eclet. Quim. 2008, 33, 61-66.