Effects of pH and Temperature on the Interaction of Pb(II) with Azraq Humic Acid Studied with Schubert's Ion Exchange Method

Authors

  • Hutaf Baker Al al-Bayt University, Mafraq, Jordan
  • Fawwaz Khalili University of Jordan, Amman, Jordan

Keywords:

humic acid, Schubert's method, lead, stability constant, thermodynamic parameters

Abstract

The binding of Pb(II) to humic acid extracted from the Azraq Oasis was studied. The influence of temperature and pH was investigated at a constant ionic strength of 0.1. This analysis was done using Schubert's ion-exchange equilibrium method and its modified version. The data showed temperature and pH dependence. The derived conditional stability constants (log βn) for 1:1 and 1:2 lead-humate complexes were determined. It was noticed that the conditional stability constant (log β1) increased with increasing pH and temperature. The derived constants and their temperature dependences were used to calculate the corresponding thermodynamic parameters ΔG, ΔH and ΔS. The results indicate that the stability of these complexes derives from a very favorable entropy increase.

Permanent URL: http://hdl.handle.net/2047/d10006126

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Published

2007-03-07

How to Cite

Baker, H., & Khalili, F. (2007). Effects of pH and Temperature on the Interaction of Pb(II) with Azraq Humic Acid Studied with Schubert’s Ion Exchange Method. Annals of Environmental Science, 1. Retrieved from https://openjournals.library.northeastern.edu/aes/journal/article/view/v1art5

Issue

Vol. 1 (2007)

Section

Articles