In laboratory studies, sorption of hexachlorobenzene (HCB) in wetland soil and floodwater was strongly influenced by high levels of naturally-occurring dissolved organic carbon (DOC). Organic matter-dominated wetlands (e.g., marshes) containing high concentrations of DOC demonstrated no advantage over mineral-dominated wetlands (e.g., bottomland hardwood forests) for sorption of HCB due to partitioning in this DOC phase. Sorption of HCB was described adequately using a three-phase model that included the DOC phase. However, partition coefficients in the bottomland hardwood soil were time-dependent. This time-dependent phenomena was not observed in the freshwater marsh soil. Sorptive assimilation of organic compounds in wetlands appears to be dependent on the unique hydrological conditions that promote sediment-water exchange and accretion rather than any enhanced sorptive ability of wetland soils themselves.
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Pardue et al. (1993) studied this question.