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http://dx.doi.org/10.4491/KSEE.2013.35.1.070

Relationship between Interfacial Tension and Solubility of Diesel Fuel in Surfactant Solutions  

Jeong, Seung-Woo (Department of Environmental Engineering, Kunsan National University)
Hur, Jeong-Hyun (Department of Environmental Engineering, Kunsan National University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.35, no.1, 2013 , pp. 70-73 More about this Journal
Abstract
Solubility of oil contaminants in surfactant solutions plays an important role in selecting a suitable surfactant type for soil remediation. Solubility measurement procedures consist of making an equilibrium between surfactant solution and oil, solvent extraction using dichloromethane, and condensation for gas chromatography analysis. Solubility measurement requires time consumption and lots of materials. Interfacial tension is the contracting force between two immiscible liquids, surfactant solution and oil, and also closely related to solubility of oil. This study established a relationship between the interfacial tension and solubility of diesel fuel in surfactant solution and suggested a quick method to estimate solubility of oil in a surfactant solution by measuring its interfacial tension. The results of this study showed that the solubility of diesel fuel in surfactant solution was exponentially increased by decreasing the interfacial tension between two immiscible liquids. The solubility of diesel fuel was significantly increased under the interfacial tension conditions below 1 dyne/cm, while the solubility change was not apparent under the interfacial tension conditions beyond 5 dyne/cm. Interfacial tension measurements may allow us to quickly select an efficient surfactant and its concentration for soil remediation.
Keywords
Surfactant; Soil Flushing; Solubility; Diesel Fuel; Interfacial Tension;
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