“Total Chromium Bioadsorption Using Immobilized queñua (Polylepis Incana) Tannin in Aqueous Solutions”. Revista Ciencia Agraria 5, no. 1 (February 7, 2026): 15–30. Accessed June 22, 2026. https://revistas.inudi.edu.pe/index.php/rca/article/view/176.