| ADSORPTION BEHAVIOUR OF THIOPHENE DERIVATIVES ON SOIL MATERIALS |
| Chang Gyun Kim† |
| Regional Research Center for Coastal Environments of Yellow Sea, Inha University, Inchon 402-751, Korea |
Corresponding Author:
Chang Gyun Kim ,Tel: + 82-32-860-7715, Fax: +82-32-872-7734 , Email: cgk@inha.ac.kr
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Received: May 15, 2002; Accepted: September 14, 2002. |
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| ABSTRACT |
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A laboratory batch test was conducted to determine the mechanisms by which sulfolane and thiolane adsorb on soil materials obtained from an alluvium/weathered rock aquifer. The site is a former Sulflnol waste sludge disposal site near Brisbane, Australia. Groundwater samples directly beneath a waste disposal site have been shown to contain higher concentration of sulfolane and relatively low concentration of thiolane from all of monitoring wells in the study area. The sulfolane is a source compound of thiolane, a reduced form of sulfolane. Thiolane is a non-polar heterocyclic organic molecule whereas sulfolane is a weakly acidic dipolar solvent.
The effect of pH on adsorption showed that adsorption was affected by the surface charge of the clay related to the polarity of sulfolane and thiolane. Higher temperatures increased the chemical potential of the solutes, which would normally act to decrease the level of adsorption. Remainder of the organic fraction of the soil following heating was associated with physical adsorption of uncharged solutes. Since these compounds were present together in the aquifer, competition might be possible in this system. Competitive adsorption on clay, which indicated the extent to which the solutes competed for the same adsorption sites as adsorption of sulfolane was comparatively suppressed by predominant adsorption of thiolane.
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| Keywords:
adsorption | contaminated soil | desorption | sulfolane | thiolane |
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