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Spectrophotometric Studies For The Effect Of Pb+2 Ion On Some Chelators | ||
| Journals kufa for chamical | ||
| Article 1, Volume 2, Issue 1, 2016, Pages 76-86 | ||
| Authors | ||
| Elham. M. Al-Rufaie; Fahad D. Fahad | ||
| Abstract | ||
| Lead is one of the toxic heavy metal when presented in a high level over it allowable limit. To detoxify this heavy metal a chelators were used as in a chelation therapy. This work studies the complexation of some chelators (EDTA and genistein) with Pb II ion. A spectrophotometric technique was applied in water and water-ethanol mixture as a solvent, at four different temperatures. A shift in it max and decrease in absorbance indicating the complex formation. The stoichiometry of these complexes were determined by a method of the continuous variation (Job's) method, it was found that Pb-EDTA were (1:2), Pb-gensitein (1:1). These chelator's have a high tendency to complex with Pb II ion which were reflected by its high values of their equilibrium constants. Thermodynamic parameters indicate a spontaneous interaction (negative free energy change G), and the enthalpy changer for Pb-gensitein complex were positive and Pb-EDTA have negative H which depends on type of the interaction and the structures of the complexes. The kinetic calculations shows a second order interaction. | ||
| Keywords | ||
| Chelating agents; EDTA; genistein; kinetic parameters; thermodynamic parameters and complexation | ||
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