M. Khalil, A. M. Radalla, A. G. Mohamed
Aug 31, 2009
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29
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Journal
Journal of Chemical & Engineering Data
Abstract
The interaction between the zwitterionic buffers N-(2-acetamido)iminodiacetic acid (ADA), N-[tris(hydroxymethyl)methyl]glycine (tricine), and N,N-bis(2-hydroxyethyl)glycine (bicine) and 1,2,4-triazole (TRZ), 3-mercapto-1,2,4-triazole (TRZSH), and 3-amino-1,2,4-triazole (TRZAM) with the divalent transition metal ions, Cu2+, Ni2+, Zn2+, and Co2+, was investigated in aqueous media at 25 °C and ionic strength I = 0.1 mol·dm−3 NaNO3 using the potentiometric technique. The acid−base properties of the ligands were investigated and discussed. The acidity constants of the ligands were determined and used for determining the stability constants of the different complexes formed in solution. The formation of the different 1:1 and 1:2 binary complexes and 1:1:1 ternary complexes is inferred from the corresponding titration curves. The ternary complex formation was found to occur in a stepwise manner. The order of stability of the complexes formed in solution was investigated in terms of the nature of the zwitterionic...