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Fig. 5. 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. The initial pH of the arsenated kaolinite was 6.4 ± 0.1; however, the pH was pre-equilibrated during 7 d in a batch desorption experiment to obtain arsenated substrate with initial pH of 5.5, 6.5, or 8.5 before the start of the flow-through desorption period. Each desorption run was replicated two times, but only one representative replicate is shown (replicates produced overlapping data). The results modeled according to Backes et al. (1995) (Table 3) are presented as a solid line at each pH.
