Abstract
The sorption of rhodamine WT (RWT), a semipolar ionizable fluorescent dye, from methanoljnvater and acetone/water mixtures was investigated using batch and column studies with two natural subsurface media. The utilities of cosolvency, solubility, and sorption theories were evaluated. The effect of cosolvents on sorption of RWT showed significant deviations from the log-linear cosolvency model. The observed cosolvency effects on sorption are qualitatively consistent with that expected for semipolar solutes or for organic acids. However, the quantitative application of either the semipolar cosolvency model or the cosolvency model with speciation could not adequately describe the observed behavior. The magnitude of the cosolvency effect differed for the two subsurface media
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