| Co-Investigator(Kenkyū-buntansha) |
MOLDRUP Per. University of Aalborg, 土木工学科, 助教授
ROLSTON D.E. Univ. of California,Davis, 環境工学科, 教授
ITO Sotaro. Hiroshima University, 工学部, 教授 (90034404)
ROLSTON Dennis E. University of California, Davis
P.MOLDRUP Univ. of Aalborg, 土木工学科, 助教授
D.E.ROLSTON Univ. of California, Davis・環境工学科, 教授
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| Budget Amount *help |
¥5,600,000 (Direct Cost: ¥5,600,000)
Fiscal Year 1993: ¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 1992: ¥2,800,000 (Direct Cost: ¥2,800,000)
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| Research Abstract |
During the one-year period, the joint research effort in all of the three laboratories has mainly focused one two areas, namely (I) analysis of the movement and retardation of toxic organic compounds (VOCs) in soils and (II) modeling and measuring the effects of intra particle pore space and of immobile water on chemical movement in soils. With respect to (I), an improved micro-column gas-cromatograph-based method for measuring the retardation of VOCs in soils was developed. Tests showed the method to be promising for rapid, direct and accurate determination of the retardation factor for a number of VOCs. By using the soil micro-column, the effect of pore-water velocity, temperature, soil grain size, and organic matter content on retardation of VOCs was studied. Concerning the multicomponent of VOCs in soil, the presence of multicomponent flux densities was confirmed by the steady-state model simulation and its related experimental measurements. Furtheremore, a transient transport model using Fick's law for diffusion and multicomponent non-linear adsorption isotherm predicted measured VOCs concentrations accurately. With respect to(II), long-term experiments for transport of a tracer solute (chloride) in micro-porous media columns were carried out and results were in close agreement with a new transport model that we developed. The model partitions the water into mobile, film, and micro-pore water. The research was presented at the Soil Science Society of America meetings in Cincinnati, USA in November, 1993. Also, a screening model (CRIOCATS) to evaluate the effect of 18 kinds of VOCs to the environment was proposed. Thus, within both research areas (I and II), important new findings appropriate for publication in international journals were achieved.
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