Bioavailability of heavy metals as a consequence of the variation in the contraction of humic and fulvic acids in the sediment of the Collotacocha high Andean wetland. SCIÉNDO INGENIUM, [S. l.], v. 18, n. 3, p. 79–85, 2022. Disponível em: https://revistas.unitru.edu.pe/index.php/PGM/article/view/4812. Acesso em: 18 jul. 2026.