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RISS 인기검색어
- 검색키워드
- 저자 : David Lockington (검색결과 3 건)
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김창균,William Paul Clarke,David Lockington 한국지하수토양환경학회 1999 지하수토양환경 Vol.4 No.2
The unknown amount of thiolane retained on different soil matrix was characterized by employing an uniquely designed glass vessel, which was forced to purge the prepared slurry sample so that thiolane may diffuse into Tenax/charcoal tube. Thiolane can be recovered ranging from approximately 89% at 1 ppm regardless of soil types, which was not consequently affected by potential biodegradation during sample preparation. For 5ppm, thiolane is more recoverable up to 92% for sand, whereas it was poorly recovered as low as 85% for clay. It strongly suggests that controls should be considered when soil types varied in a concerned area. The technique was eventually capable of determination of thiolane for the samples taken from the site which led to be taken into consideration for proper site remediation.
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COMPETITIVE ADSORPTION OF SULFOLANE AND THIOLANE ON CLAY MATERIALS
Kim, Chang Gyun,Clarke, William P .,Lockington, David 한국화학공학회 1999 Korean Journal of Chemical Engineering Vol.16 No.2
Groundwater samples directly beneath a waste disposal site have been shown to contain a higher concentration of sulfolane and a relatively low concentration of thiolane. The sulfolane is a source compound of thiolane, a reduced form of sulfolane. In subsequent analyses of groundwater samples, these compounds have been detected from all of the monitoring wells in the study area. Since these compounds are present together in an aquifer, a possible competition, that can happen in such a system, has been investigated. Thiolane is a nonpolar heterocyclic organic compound whereas sulfolane is a weakly acidic dipolar solvent. As expected, thiolane adsorbs more strongly onto clay than sulfolane in a single solute system. For regression of bisolute system using Matlab to obtain Q (maximum number of moles of solute adsorbed per unit weight of adsorbent), k₁ (constants related to the energy of adsorption for sulfolane), and k₂ (constants related to the energy of adsorption for thiolane), the k₁ value (sulfolane) is smaller than the k₂ value (thiolane) which reflects that thiolane is more strongly adsorbed than sulfolane. This is strongly consistent with the result obtained from single solute system. The Q for the sulfolane and combined data is the same that indicates that the sulfolane data is dominantly fitted because the concentrations of sulfolane are much greater than those of thiolane in the experiments. In combined data regression, the suppression of sulfolane adsorption on clay was also observed by the presence of thiolane.
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