| Summary: | 碩士 === 國立交通大學 === 環境工程所 === 90 === Although the fate and transport of volatile organic compounds (VOCs) in soils heavily depend on their vapor-phase sorptive behavior, most studies involving the sorption of VOCs have focused only on soil moisture and nonpolar compounds. Therefore, this work presents a nevel sorption model that simultaneously considers temperature and soil moisture can be developed. To do so, the sorption experiments are carried out using a batch-equilibrium apparatus. Next, vapor-sorption of acetonitrile, toluene, trichloroethylene, and tetrachloroethylene are determined at five temperature conditions ranging from 0 to 40oC and six soil moisture conditions ranging from 0 to 11.4%. Additionally, a Hewlett Packard 5890 Series II GC-FID is employed in analysis of VOCs. Moreover, an ANOVA statistical evaluation of adsorption data for organic vapors on Hsinchu soil is conducted. In this study ,the results indicate that higher soil moisture and temperature affect the VOCs adsorption by decreasing the retention of these compounds on Hsinchu soil. Experimental results demonstrate that the proposed model predicts the partition coefficient of VOCs from vapor phase to soil surface within an accuracy of 0.955 for the relation coefficient value. Furthermore, the proposed model can accurately estimate the sorptive behavior, thus providing further insight into the transport of VOCs in the vadose zones.
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