Evaluation of the roles of metals and humic fractions in the podzolization ofsoils from the Amazon region using two analytical spectroscopy techniques - Tadinia, Amanda M; Nicolodelli, Gustavo; Marangoni, Bruno S.; Mounier, Stephane; Montes, Celia Regina; Milori, Debora Marcondes Bastos Pereira (Microchemical Journal, 2019)