Mass Transfer Between Organic and Aqueous Phases: Investigations Using aContinuously Stirred Flow Cell

摘要

Contaminant partitioning between organic and aqueous phases in porous mediaincludes nonaqueous phase liquid (NAPL) dissolution and sorption by soil organic matter. Mass transport in the aqueous phase is governed by advection, but partitioning is a diffusion-controlled process. Since diffusion is usually slower than advective transport, dissolution and sorption are often subject to mass transfer (rate) limitations. Mass transfer is often modeled using a first-order, two-site model. Deficiencies of the two-site model include model parameters that are dependent on pore water velocity and an inability to predict slow, long-term desorption (tailing).