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  • 标题:Effects of pH and Temperature on the Interaction of Pb(II) with Azraq Humic Acid Studied with Schubert's Ion Exchange Method
  • 本地全文:下载
  • 作者:Baker, Hutaf ; Khalili, Fawwaz
  • 期刊名称:Annals of Environmental Science
  • 出版年度:2007
  • 卷号:1
  • 期号:1
  • 页码:8
  • 出版社:Northeastern University
  • 摘要: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.
  • 关键词:Humic acid; Schubert's method; lead; stability constant; thermodynamic parameters
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