a alibrahimi, ahmed 2025. Synthesis, Characterization & Biological Activity Assessment of a New Oxadiazole Derivative Based on Nicotinic Hydrazide and Using It for Extraction of Ni and Co from Aqueous Solutions. Wasit Journal for Pure sciences . 4, 1 (Mar. 2025), 294–308. DOI:https://doi.org/10.31185/wjps.671.