Ion association studies in aqueous NiSO4 solutions by positron lifetime spectroscopy |
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Authors: | G Duplâtre A Haessler A Marques Netto |
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Institution: | (1) Laboratoire de Chimie Nucléaire, Centre de Recherches Nucléaires et Université Louis Pasteur, B.P. 20, 67037 Strasbourg Cedex, (France);(2) Present address: Universidade Federal de Minas Gerais, Belo Horizonte, Brazil |
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Abstract: | 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. |
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Keywords: | |
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