?THERMODYNAMIC PARAMETERS AND STABILITIES OF SOME RARE-EARTH METAL ION CHELATES OF a-VALINE

Authors

  • M.E.M. EMAM Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt
  • I.M.M. KENAwy Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt
  • Y.A. ELEWADY Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt
  • A. ABDEL- HAMID Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt

Keywords:

Formation constant, Thermodynamic parameters, Rare-earths.

Abstract

Solution equilibria for some rare-earth metal ions with valine have been studied potentiometrically in aqueous
medium at temperatures from 25 to 55"and ionic strengths (l) from 0.1 to 1.0mol dm? NaCl04 • The thermodynamic
parameters ~H~,~S~ and ~G~ for the formation processes were evaluated in terms of temperature, ionic strength and
nature of metal ion present. The stability of the complexes was found to be: La(III) <Nd(III) <Gd(lII) <Eu(lII) <Yb(III)
< Lu (III).

Published

1994-01-24

How to Cite

EMAM, M., KENAwy, I., ELEWADY, Y., & HAMID, A. A.-. (1994). ?THERMODYNAMIC PARAMETERS AND STABILITIES OF SOME RARE-EARTH METAL ION CHELATES OF a-VALINE. Biological Sciences - PJSIR, 37(1-2), 12–17. Retrieved from https://v2.pjsir.org/index.php/biological-sciences/article/view/2561

Issue

Vol. 37 No. 1-2 (1994): Pakistan Journal of Scientific and Industrial Research

Section

Articles