m/V also 20g/L
original equation in the study: »FeO<1-> + SrCO3 = »FeOSrCO3<1-> with log K = 5.40 ± 1.05 (»FeO<1-> + H<1+> = »FeOH with log K = 9.70 ± 0.02; Sr<2+> + CO3<2-> = SrCO3 with log K = 2.81 (Busenberg, E.; Plummer, L. N.; Parker, V. B.: The solubility of strontianite (SrCO3) in CO2-H2O solutions between 2 and 91°C, Geochim. Cosmochim. Acta, 48, (1984), 2021-2035.))
combination of surface complexation and ion exchange model