Stability constants of UO22+, Th4+ and Ce3+ with L-asparagine and thermodynamic parameters


Teksoz S. , Unak P.

PHYSICS AND CHEMISTRY OF LIQUIDS, cilt.42, ss.569-575, 2004 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 42 Konu: 6
  • Basım Tarihi: 2004
  • Doi Numarası: 10.1080/00319100410001710598
  • Dergi Adı: PHYSICS AND CHEMISTRY OF LIQUIDS
  • Sayfa Sayısı: ss.569-575

Özet

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.