Fig. 4
From: A study on the dissolution rates of K-Cr(VI)-jarosites: kinetic analysis and implications
SEM–EDS results of a partially decomposed particle in OH− medium. a SEM image of a partially decomposed particle in OH−medium (0.05 mol L−1, T = 30 °C, pH = 12.44, d0 = 38–44 µm, CrO −24 = 0.77 mol, tr = 20 min). b EDS analysis corresponding to the halo in Fig. 4a. c EDS analysis corresponding to the core in Fig. 4a. Results show that the unreacted core kinetic model with formation of ashes describes the dissolution process of KFe3[(SO4)2 − X(CrO4)X](OH)6 in OH− medium