Ion association studies in aqueous NiSO4 solutions by positron lifetime spectroscopy

  • G. Duplâtre
  • A. Haessler
  • A. Marques Netto


Ion association has been studied by positron lifetime spectroscopy in aqueous solutions containing the Ni2+ and SO 4 2− ions at 294 K with the double aim of assessing the reliability of the method for quantitative determination of complex formation constants and of probing the validity of various expressions to calculate single-ion activity coefficients at high ionic strength. The existence of two complexes, identified as NiSO4 and Ni2SO 4 2+ , is shown by the data analysis. Considering the formation constant of the former, KI=(196±10)M−1, determined in previous works leads to discarding several of the expressions commonly used for activity corrections. Two possible values are retained for KI, (193±20)M−1 and (179±20)M−1, while KII related to Ni2SO 4 2+ is better defined, as (2.57±0.14)M−1.


Aqueous Solution Inorganic Chemistry Ionic Strength Complex Formation Association Study 
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Copyright information

© Akadémiai Kiadó 1984

Authors and Affiliations

  • G. Duplâtre
    • 1
  • A. Haessler
    • 1
  • A. Marques Netto
    • 1
  1. 1.Laboratoire de Chimie NucléaireCentre de Recherches Nucléaires et Université Louis PasteurStrasbourg Cedex(France)

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