$\begin{array}{1 1}\Lambda_m^{\infty}=\lambda_{eq}^{\infty}(Fe^{3+})+\lambda_{eq}^{\infty}(SO_4^{2-})\\\Lambda_m^{\infty}=\lambda_{m}^{\infty}(Fe^{3+})+\lambda_{eq}^{\infty}(SO_4^{2-})\\\Lambda_m^{\infty}=\lambda_{eq}^{\infty}(Fe^{3+})+3\lambda_{eq}^{\infty}(SO_4^{2-})\\\Lambda_m^{\infty}=2\lambda_{m}^{\infty}(Fe^{3+})+3\lambda_{m}^{\infty}(SO_4^{2-})\end{array} $