The aim of this work was to develop a quantitative description of the ion exchange equilibria of arsenic on a strong anionic resin, in the presence of nitrates and sulphates. First, the ion exchange equilibrium data of As(V) and NO3− on a strong anionic resin in chloride form were obtained and described with a model based on the mass action law. Namely, assuming ideal behaviour for both solution and resin phase, the thermodynamic constant of the As(V)/Cl− and NO3−/Cl− ion exchange equilibria were estimated by fitting of experimental data. Then, these equilibrium constants were used to predict the ion exchange behaviour of the ternary system As(V)/NO3−/Cl−, providing a rather good agreement with experimental results. The ion exchange equilibria involving sulphate ions were also studied, showing a very high affinity to the resin phase. This behaviour did not allow a quantitative robust modelling of the equilibrium pattern. The results discussed in this paper represent a first step toward the development of a comprehensive modelling of the ion exchange process for the removal of As(V) from surface and groundwater in the presence of competitive, naturally occurring anions.
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Research Article| December 01 2005
Ion exchange equilibria of arsenic in the presence of high sulphate and nitrate concentrations
Water Supply (2005) 5 (5): 67–74.
R. Baciocchi, A. Chiavola, R. Gavasci; Ion exchange equilibria of arsenic in the presence of high sulphate and nitrate concentrations. Water Supply 1 December 2005; 5 (5): 67–74. doi: https://doi.org/10.2166/ws.2005.0040
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