Interfacial Tension of Toluene + Water + Sodium Dodecyl Sulfate from (20 to 50) °C and pH between 4 and 9

• Published in: Journal of chemical and engineering data Vol. 51; no. 5; pp. 1832 - 1835
• Main Authors: Saien, Javad, Akbari, Somayeh
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 14.09.2006
• Subjects: Chemistry; Exact sciences and technology; General and physical chemistry; Solutions; Water; Anionic surfactant; Hydrocarbon; Medium effect; Ternary mixture; Toluene; Concentration effect; Surface properties; pH; Surface tension
• ISSN: 0021-9568; 1520-5134
• DOI: 10.1021/je060204g

Interfacial tension of toluene + water + sodium dodecyl sulfate is reported over the aqueous surfactant concentration range of (0 to 34.68 × 10-5) mol·L-1, the temperature range of (20 to 50) °C, and the pH range of 4 to 9. This system is frequently used as a high interfacial tension system for liquid−liquid extraction investigations. The measurements were made by the drop-weight method, and interfacial tension values ranged from (23.1 to 38.1) mN·m-1. The data show a nonlinear decrease with increasing surfactant concentration and temperature; however, there is almost a linear decrease with increasing pH. The interfacial pressure is also derived. The obtained data were correlated by empirical equations.