| Description |
x, 59 leaves : illustrations ; 28 cm. |
| Summary |
"Recent discoveries regarding volatile organic compounds-' (VOCs) fate in phytoremediation have confirmed that diffusion and subsequent volatilization from trees comprise a fundamental transport process. Diffusion of VOCs through woody plant tissues has direct impact on contaminant fate in phytoremediation. Diffusion studies experiments were conducted to investigate the transport rates of VOCs in wood tissues. Compounds investigated were chlorinated compounds such as trichloroethylene (TCE), perchloroethene (PCE), and tetrachloroethane (TeCA), and aromatic hydrocarbons such as benzene, toluene, and methyl tert-butyl ether (MTBE). Direct measurement of diffusion rates was carried out on hybrid poplar tree cores (P delotoides X P nigra, close DN34). Diffusivities were determined by modeling the diffusive transport using one dimensional diffusive flux with appropriate initial and boundary conditions. Diffusivities found to be inversely related to molecular weight of the compounds. The determined diffusivities compare favorably with theory-based predictions, considering wood as a three phase media"--Abstract, leaf iv. |
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