Fig. 3 Comparison of gibbsite dissolution rate in the mixed-flow-through and the column reactors at various pHs. (a) The dissolution rates of the flow-through experiments are normalized to the final surface area. (b) The dissolution rates of the flow-through experiments are normalized to the initial surface area. An excellent agreement is observed between the dissolution rates of the mixed flow-through experiments that were normalized to the final surface area with these of the column experiments.