【Note】
Estimation of Amounts of Volatile Chlorinated Organic Compounds Adsorbed to Soil at Any Water Content Level
Takeshi Kobayashi*, Yuko Shimizu** and Kohei Urano**
* Faculty of Engineering, Yokohama National University
** Graduate School of Environment and Information Sciences, Yokohama National University
† Correspondence should be addressed to Takeshi Kobayashi:
Faculty of Engineering, Yokohama National University
（79-5 Tokiwadai Hodogayaku, Yokohama, 240-8501 Japan）

Abstract
The adsorption characteristics of volatile chlorinated organic compounds in soil must be clarified to understand the extent of contamination and to determine effective cleanup conditions for soil vapor extraction. In this study, an adsorption equilibrium model for soil with any water content and an estimation method for adsorbed amounts were developed. This model was developed with consideration of the different adsorption rates of dry and wet pores, the adsorption to organic soil matter and the dissolution in water. The adsorption equilibrium relation of every kind of soil and every substance can be expressed well using the dry pore adsorption ratio γ. γ can also be expressed related to the water content. The predicted amounts agreed well with the measured data.

Key words: volatile chlorinated organic compound, soil contamination, adsorption equilibrium, water content, dry pore adsorption ratio