Bibliographic Details
| Title: |
Thermodynamic studies on the interaction between some amino acids with some rare earth metal ions in aqueous solutions |
| Authors: |
Mohamed, AbdAllah A. abdelwah@hotmail.com, Bakr, Moustafa F.1, Abd El-Fattah, Khaled A.1 |
| Source: |
Thermochimica Acta. Nov2003, Vol. 405 Issue 2, p235. 19p. |
| Subjects: |
Amino acids, Glycine, Metal ions, Rare earth metals |
| Abstract: |
The interactions between the amino acids (glycine and l-threonine) with some rare earth metal ions (Pr3+, Nd3+, Eu3+, Gd3+, Dy3+, Ho3+ and Yb3+) were studied at a wide range from ionic strengths (0.07–0.32 M KNO3) and temperatures (25–45 °C) in aqueous solutions by using Bjerrum potentiometric method. The stoichiometric and thermodynamic stability constants were calculated as well as the standard thermodynamic parameters (ΔG°, ΔH° and ΔS°) for all possible reactions that occur. The degree of formation (n¯) for all studied systems was determined and discussed. The thermodynamic parameters differences (ΔΔG°, ΔΔH° and ΔΔS°) were calculated and discussed to determine the factors which control these complexation processes from the thermodynamic point of view. [Copyright &y& Elsevier] |
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| Database: |
Engineering Source |
