Fig. 4. The effect of pH on desorption of As(V) from kaolinite using a flow-through desorption setup. Desorption solutions of different pH levels (5.5, 6.5, or 8.5) were used to desorb As(V) from kaolinite. Each pH level was replicated two times (R1, R2). The initial pH of the arsenated kaolinite was 6.4 ± 0.1 and the pH was not pre-equilibrated.