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Model-Based Measurements of Diffusion of Sulfuric Acid into Water Using Raman Spectroscopy

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Abstract:

The diffusion of molecular species within a sulfuric acid–water system has been monitored by Raman spectroscopy, a thermodynamic-chemical model of the mass transport properties of the species has been established, and its parameters optimized. It has been shown that the non-ideality of this multicomponent system plays a crucial role in its mass transport properties, which have been explained in terms of a diffusion model for the molecular species. The individual effective diffusion coefficients are not constant (characteristic of ideal systems) but are a function of the concentration of the species in solution. The model has been conceived in such a way that it can be adapted to any multicomponent mixture when the equilibriums among the ions are known. Raman spectroscopy provides the means to derive the speciation and concentration of species in multicomponent systems, and we have shown that the model-based measurement of the diffusion properties using Raman is a robust and accurate technique that allows for measuring the individual diffusion coefficients of the species in the mentioned system.

Keywords: ACID MINE DRAINAGE; BISULFATE; DIFFUSION; MULTICOMPONENT MIXTURES; RAMAN SPECTROSCOPY; SULFATE; SULFURIC ACID

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370209790108932

Affiliations: 1: Unidad Asociada Universidad de Valladolid CSIC a través del Centro de Astrobiología, Cristalografía y Mineralogía, Facultad de Ciencias, Paseo Prado de la Magdalena s/n, 47011 Valladolid, Spain; Department of Earth and Planetary Sciences and McDonnell Center for Space Sciences, Washington University, St. Louis, Missouri 63130, USA. psobron@levee.wustl.edu 2: Unidad Asociada Universidad de Valladolid CSIC a través del Centro de Astrobiología, Cristalografía y Mineralogía, Facultad de Ciencias, Paseo Prado de la Magdalena s/n, 47011 Valladolid, Spain 3: Department of Chemistry, University of Oslo, P.O. Box 1033 Blindern, N-0372 Oslo Norway

Publication date: December 1, 2009

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