Abstract
Sorption of organic chemicals in soils is considered here as an equilibrium of environmental chemicals in three phases: dissolved, sorbed to dissolved macromolecules, and sorbed to the bulk soil matrix. In the present study we demonstrate the binding of organic chemicals to water-soluble soil organic matter using an experimental acidic herbicide as an example. Sorption isotherms are determined for the sorption of organic chemicals to bulk soil materials (Ap horizons) and to water-soluble organic matter. From these data an effective equilibrium sorption isotherm to bulk soil can be calculated which takes into account the sorption of organic chemicals to dissolved organic carbon. This is compared to a more traditional two-phase model of the same type, where the mobile sorbent is ignored.
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