Abstract
This chapter sets out the developing theoretical basis for the use of diffusive gradients in thin-films (DGT) in soils and sediments and appraises the key applications that have advanced understanding of chemical interactions occurring in these complex media. When DGT is deployed in soils or sediments, a steady-state condition is never truly reached. Thus, time-dependent models are required to quantify the contribution of diffusional supply and release from the solid-phase to the accumulated mass of solute. The DGT-induced fluxes in soils and sediments (DIFS) model provides a numerical simulation of the interaction between the DGT device and its deployment medium. The model assumes that all pore spaces are filled with solution, which restricts its use to sediments and soils with moisture content at or above field capacity. Initial calculations, based on a finite difference approach, considered two-dimensional diffusion and release processes in the soil perpendicular to the plane of the DGT device.
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