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Sorption and desorption rate comparisons for 1,2‐dichlorobenzene to a peat soil

The rates of sorption and desorption were quantified for 1,2‐dichlorobenzene to and from a peat soil using a batch methodology. Solute—sorbent contact times of 2, 7, 14, 49, and 99 d were studied for the desorption rate experiments. The experimental data were simulated using a distributed rate parameter model. The optimal model fitting parameters and their 95% confidence intervals were computed. The rates of desorption were significantly slower than the rate of uptake for solute–sorbent contact times greater than 2 d. For contact times greater than 2 d, a significant fraction of the 1,2‐dichlorobenzene seemed to be irreversibly sorbed. However, the rate of desorption and the magnitude of the irreversible fraction were independent of contact time for contact times greater than 2 d. The rate observations for this study were consistent with an intraorganic matter diffusion mechanism.