Al Shamaa, Ali Safaa, and Majid R. Majed Al-palany. 2024. “Removal of Hexavalent Chromium from Aqueous Solution Using Olive Tree Bark As Natural Adsorbent ”. Mesopotamia Environmental Journal (mesop. Environ. J) ISSN: 2410-2598 8 (1):48-59. https://mej.uobabylon.edu.iq/index.php/mej/article/view/169.