Numerical simulation of PAHs sorption/desorption on soil with the influence of Tween80

Article type: Research Article

Authors: CHEN, Jing | WANG, Xue-jun | HU, Jun-dong | XU, Fu-liu | TAO, Shu

Affiliations: College of Environmental Science, MOE Laboratory of Earth Surface Process, Peking University, Beijing 100871, China

Note: [] Corresponding author. E-mail: [email protected]

Abstract: In this paper, the influences of inionic surfactant Tween80 on polycyclic aromatic hydrocarbons (PAHs) sorption/desorption on artificially contaminated soil were studied, and γ model was applied to simulate the influences. Results showed that, with the use of Tween 80, the sorption behaviors of PAHs on soil altered significantly. Adsorbed Tween 80 increased the sorption amount of PAHs while the dissolved Tween80 increased the apparent solubility of PAHs. These two processes exert influences on the sorption coefficient of PAHs in soil-water system, which can be depicted by apparent sorption coefficient. The partition coefficients (the soil/water partition coefficient of PAHs and surfactants obtained from sorption experiments) and statistical parameters used in the amended γ model were obtained in independent experiments. With these parameters, the γ model could provide a satisfactory independent prediction of PAHs release from soil to aqueous phase at two surfactant concentrations.

Keywords: Tween80, PAHs, soil, sorption/desorption, γ model

Journal: Journal of Environmental Sciences, vol. 18, no. 4, pp. 716-720, 2006