JEQ Journal of Natural Resources and Life Sciences Education
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Journal of Environmental Quality 31:970-978 (2002)
© 2002 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America

TECHNICAL REPORTS
Vadose Zone Processes and Chemical Transport

Sorption Kinetics of Toluene in Humin under Two Different Levels of Relative Humidity

Yang-hsin Shih* and Shian-chee Wu

Graduate Institute of Environmental Engineering, National Taiwan University, No. 71, Chou Shan Road, Taipei 106, Taiwan R.O.C

* Corresponding author (d7541007{at}ms.cc.ntu.edu.tw)

Received for publication June 11, 2001. To identify any resistant fraction for desorption of toluene from humin and to quantify the sorption–desorption rates, the time courses of toluene sorption to compressed humin disks and to a thin humin film were investigated. The apparent diffusivity of toluene with humin disks ranges from 10-8 to 10-9 cm2/s and increases with temperature, based on the weight change of humin disks mounted on a microbalance and on the results simulated by use of a diffusion model. No detectable level of residual toluene was found after desorption, as revealed either by the gravimetric analysis or by the Fourier transform infrared (FTIR) spectrum obtained at either low or high humidity. The time scale for intrinsic vapor sorption without mass transfer hindrance is less than a few minutes with the thin film. All the results indicate that the sorption of toluene to humin is reversible and mainly diffusion controlled. This finding helps to better understand the sorption kinetics associated with humin and soil organic matter.

Abbreviations: FTIR, Fourier transform infrared • IR, infrared • NMR, nuclear magnetic resonance • SEM, scanning electron microscopy • SOM, soil organic matter • VOC, volatile organic compound






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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education		 Vadose Zone Journal
Soil Science Society of America Journal Journal of Plant Registrations The Plant Genome
Copyright © 2002 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.