“Effectiveness Test of Immobilization of Aspergillus Niger Fungi With Different Biomass on Hexavalent Chromium (Cr VI) in Water ”. Advances in Tropical Biodiversity and Environmental Sciences 9, no. 3 (January 18, 2026): 187–193. Accessed August 17, 2026. https://ejournal1.unud.ac.id/index.php/atbes/article/view/2018.