Abstract
In this study, we examined the complex formation of the Cr(III) ion with a variety of biological pH buffers [tris(hydroxymethyl)aminomethane (TRIS), N-[tris(hydroxymethyl)methyl]-2-aminoethanesulfonic acid (TES), N-[tris(hydroxymethyl)methyl]-3-aminopropanesulfonic acid (TAPS), N-[tris(hydroxymethyl)methyl]-3-amino-2-hydroxypropanesulfonic acid (TAPSO), N-tris(hydroxymethyl)methyl-4-aminobutane sulfonic acid (TABS), 4-morpholine ethane sulfonic acid (MES), 4-morpholine propane sulfonic acid (MOPS), 3-morpholino-2-hydroxypropane sulfonic acid (MOPSO), and 4-(N-morpholino)butanesulfonic acid (MOBS)] by potentiometric measurements at 310.15 K and ionic strength I = 0.16 mol·dm–3 KCl. The protonation constants of the biological buffers were determined and discussed, under the above conditions. The overall stability constants were obtained by the least-squares curve-fitting program HYPERQUAD 2008. As a result of the numerical treatment, a model composed of five main species CrL, CrL2, CrL2(OH), CrL2(OH)2, and ...
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