Payehghadr, M.; Haghgoo Qezelje, H.; Nourifard, F.; Attaran, A.; Kalhor, M. Preconcentration of Ultra-Traces of Cu(II) in Water Samples Using SBA-15 Sorbent Modified With a Thiocarbohydrazide Ligand Prior to Determination by Flame Atomic Absorption Spectrometry. J. Serb. Chem. Soc. 2019, 84, 489-501.