Enhanced Trichloroethene Desorption from Long-Term Contaminated Soil Using Triton X-100 and pH Increasesby Dipak Sahoo,
James A. Smith,
Thomas E. Imbrigiotta,
Heather M. McLellan,
Abstract: Laboratory experiments were conducted to study the effect of Triton X-100 and pH changes on trichloroethene (TCE) desorption from field-contaminated soil to water. In laboratory batch experiments, Triton X-100 solutions (at near critical micelle concentrations) and pH increases enhanced desorption in early time-periods. An extended desorption curve demonstrated that desorption is a non-equilibrium process for long-term contaminated soil. Two kinetic desorption models —a two-site model and a multi-compartment model with a gamma distribution of rate constants—were used to interpret the data and determine the mass-transfer coefficients. The multi-compartment model performed better than the two-site model in modeling desorption of TCE from field contaminated soil.
Subject Headings: Soil pollution | Desorption | Data processing | pH | Laboratory tests | TCE | Soil water | Water pollution
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