PHYSICS AND CHEMISTRY OF LIQUIDS, cilt.42, ss.569-575, 2004 (SCI İndekslerine Giren Dergi)
The stability constants of L-asparagine and its complexes formed with UO22+, Th4+ and Ce3+ ions were determined potentiometrically using the Calvin-Bjerrum technique as adopted by Irving and Rossotti at different temperatures (290, 298 and 310 K), in 0.1 M KCl. The stability constants were computed using the least-squares treatment method in EXCEL program for proton-ligand and metal-ligand at the temperatures given above. The protonation constants of L-asparagine (109,62) were found to be 13.07 +/- 0.01, 12.58 +/- 0.10, 12.28 +/- 0.16 at 290, 298 and 310 K, respectively. In addition, the thermodynamic parameters DeltaH, DeltaG and DeltaS of L-asparagine and its complexes with metal ions were evaluated and discussed at the same temperatures.