An investigation of the Lead(II)-hydroxide system

W. Nimal Perera, G. Hefter, P. M. Sipos

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Abstract

A detailed investigation of the Pb(II)/OH- system has been made in NaClO4 media at 25 °C. Combined UV-vis spectrophotometric-potentiometric titrations at [Pb(II)]T ≤ 10 μM using a long path length cell detected only four mononuclear hydroxide complexes. The values of log *β1q, for the equilibria Pb2+(aq) + qH2O ↔ Pb(OH)q(2-q)+(aq) + qH+(aq), were -7.2, -16.1, -26.5, and -38.0 for q = 1-4, respectively, at ionic strength I = 1 M (NaClO4). Similar results were obtained at I = 5 M (NaClO4). No evidence was found for higher order complexes (q > 4) even at very high [OH-]/[Pb(II)] ratios, nor for polynuclear species at [Pb(II)]T ≤ 10 μM. Measurements using 207Pb-NMR and Raman spectroscopies and differential pulse polarography (DPP) provided only semiquantitative confirmation. The mononuclear Pb(OH)q(2-q)+(aq) complexes are the only hydrolyzed species likely to be significant under typical environmental and biological conditions.

Original languageEnglish
Pages (from-to)3974-3978
Number of pages5
JournalInorganic Chemistry
Volume40
Issue number16
DOIs
Publication statusPublished - Jul 30 2001

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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