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These concentrations were calculated from published equilibrium constants S4 File. The dotted vertical lines at pH = 3.90 and pH = 7.96 demarcate the range of pH values observed in this study. This suggests that from the minimum observed pH at 3.90 to pH = pKa2 at 6.77 most of the As(V) has a −1 charge, and from pH = pKa2 at 6.77 to the maximum observed pH at 7.96 most of the As(V) has a −2 charge [23].
