In Fig. 2, the distribution of the individual Hg(II) species inaqueous solution at low Cl concentration is presented for thepH-range considered in this work. It has to be stressed, thatnon-ideal electrolyte solution properties, effects of ionic strengthand interaction with further dissolved compounds are not consideredby this simplified equilibrium calculation. For improved clarity,species with insignificant share (<1%) are not shown. For thethree pH-ranges (pH < 7), (7 < pH < 9) and (pH > 9), different predominantHg(II) compounds are calculated as HgCl2, [Hg(SO3)2]2and Hg(OH)2 respectively. Further calculations reveal that theincrease of Cl concentration shifts the equilibrium towardsHg(II) complexes with three or four Cl ligands in the lowerpH-range (not presented). Increasing S(IV) concentration resultsin increased share of [Hg(SO3)2]2 in the mid pH-range. However,for all concentrations within the relevant range for FGD wastewaters, the predominant Hg(II) compound changes for increasingpH-
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