Effectiveness Test of Immobilization of Aspergillus niger Fungi with Different Biomass on Hexavalent Chromium (Cr VI) in Water . ATBES [Internet]. 2026 Jan. 18 [cited 2026 Aug. 17];9(3):187-93. Available from: https://ejournal1.unud.ac.id/index.php/atbes/article/view/2018