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. 2012 Feb 17;7(2):e30726. doi: 10.1371/journal.pone.0030726

Figure 2. Mole fractions of Zn species as functions of pH at 298 K.

Figure 2

Mole fractions of Zn species were calculated by using formation constants and acid dissociation constants reported in the literature [18], [20]–[22]. The ln β values at 298 K are shown in parentheses. a) Mole fractions of Zn species in malate solutions. Total concentrations of Zn and malate are 5 mM and 10 mM, respectively. b) Mole fractions of Zn species in citrate solutions. Total concentrations of Zn and citrate are 5 mM and 10 mM, respectively. c) Mole fractions of Zn species in orthophosphate solutions. Total concentrations of Zn and phosphate are 5 mM and 1 M, respectively.