Abstract
Reactions of mercury(II) with iminodiacetic (H2Ida), 2-hydroxyethyliminodiacetic (H2Heida), and nitrilotriacetic acids (H3Nta) were studied by spectrophotometry and pH potentiometry. The resulting complexes included [HgIda], [Hg(OH)Ida]−, [HgIda2]2−, [HgHeida], [Hg(OH)Heida]−, [Hg(Heida)2]2−, [HgNta]−, [HgNta2]4−, [Hg(Ida)Heida]2−, [Hg(Ida)Nta]3−, and [Hg(Heida)Nta]3−. The logarithms of their stability constants calculated for I = 0.1 (NaClO4) and T = 20 ± 2°C were 11.14 ± 0.07, 20.33 ± 0.08, 19.40 ± 0.10, 11.42 ± 0.04, 19.68 ± 0.11, 18.48 ± 0.09, 13.42 ± 0.05, 20.80 ± 0.08, 19.05 ± 0.06, 20.64 ± 0.11, and 20.53 ± 0.16, respectively. The experimental data were analyzed in terms of the mathematical models that predict the existence of a wide spectrum of complex species in solution and allow one to consider only those species that are sufficient for accurate reproduction of the observed pattern.
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