Abstract
Modeling and experimental approaches to study reactive transport across chemical gradients in porous media are presented. Particular emphasis is placed on a purposeful experimental setup to obtain information necessary for model calibration and verification. As example, diffusion tube experiments on the layered acidic jarosite/alkaline coal fly ash system have been carried out using radiotracers 3 H + , 22 Na + , and 59 Fe 3+ . Such radiotracer diffusion tube experiments provide modelers with reliable information incorporating some of the complexities observed in the environment such as local heterogeneities.
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