Modeling Contaminant Transport in Plants
نویسنده
چکیده
In order to predict the fate of contaminant transport in plants, experiments were conducted and simple models were used to simulate the processes. Diffusion experiments were carried out to estimate contaminant diffusivity within plant roots, while adsorption experiments were used to investigate the adsorption of contaminant in plant stems. We found that plants can enhance the removal of trichloroethylene (TCE) by adsorbing it on the plant biomass and by transporting it upward into the vadose zone where it may diffuse into soil and escape to the atmosphere. The measured diffusivity of TCE in plant roots is in the range of 10 cm/sec. to 10 cm/sec. The adsorption coefficient for TCE is in the range of 20 to 35; for 1,1,1-trichloroethane (TCA), it is about 15. Experiments show that there is little or no adsorption of methyl-tert-butyl ether (MTBE) in plant stems.
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