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

机译:基于模型的拉曼光谱法测量硫酸向水中的扩散

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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.
机译:用拉曼光谱法监测了分子物质在硫酸-水系统中的扩散,建立了该物质的传质特性的热力学化学模型,并对其参数进行了优化。已经表明,该多组分系统的非理想性在其传质中起着至关重要的作用,这已经根据分子种类的扩散模型进行了解释。各个有效扩散系数不是恒定的(理想系统的特性),而是溶液中物质浓度的函数。该模型的构想是,当已知离子之间的平衡时,它可以适用于任何多组分混合物。拉曼光谱法提供了推导多组分系统中物种形态和浓度的方法,并且我们已经表明,使用拉曼模型基于模型的扩散特性测量是一种鲁棒且准确的技术,可以测量物种的各个扩散系数在上述系统中。

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    《Applied Spectroscopy》 |2009年第12期|1382-1388|共7页
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