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J Hazard Mater

Title:		Effects of surfactants and salt on Henry's constant of n-hexane
Author(s):		Yang C; Chen F; Luo S; Xie G; Zeng G; Fan C;
Address:		"College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China. chunpingyang@gmail.com"
Journal Title:		J Hazard Mater
Year:		2010
Volume:		20091003
Issue:		1-Mar
Page Number:		187 - 192
DOI:		10.1016/j.jhazmat.2009.09.147
ISSN/ISBN:		1873-3336 (Electronic) 0304-3894 (Linking)
Abstract:		"n-Hexane biological removal is intrinsically limited by its hydrophobic nature and low bioavailability. The addition of surfactants could enhance the transport of volatile organic compounds (VOCs) and change the gas-liquid equilibrium of VOCs. In this paper, the effects of four surfactants, sodium dodecyl sulfate (SDS), cetyltrimethylammonium bromide (CTAB), tert-octylphenoxypoly-ethoxyethanol (Triton X-100), polyoxyethylene (20) sorbitan monooleate (Tween 80), and sodium nitrate on apparent Henry's constant of n-hexane in surfactant solutions were investigated. The apparent Henry's constants were significantly reduced when surfactants concentrations exceeded their critical micelle concentrations (cmc's). On a cmc basis, the anionic surfactant SDS was found to have the greatest effect on the apparent Henry's constant with CTAB succeeding, then followed by Triton X-100 and Tween 80. However, the apparent Henry's constant of n-hexane decreased even more rapidly when Triton X-100, a nonionic surfactant, was added than when the ionic surfactant of SDS or CTAB was applied under identical mass concentration and other conditions. These results suggest that Triton X-100 have the biggest solubilization of n-hexane among the four surfactants. Sodium nitrate slightly decreased the apparent Henry's constant of n-hexane in surfactant solutions, and could be considered as a cosolvent in the surfactant-(n-hexane) solution. In addition, the relationship between apparent Henry's constant and surfactant concentration was further developed"
Keywords:		"Anions Biological Availability Chemistry, Physical/methods Gases Hexanes/*chemistry Ions Micelles Nitrates/chemistry Octoxynol/pharmacology Organic Chemicals/chemistry/isolation & purification Polysorbates/pharmacology Salts/*chemistry Surface-Active Agen;"
Notes:		"MedlineYang, Chunping Chen, Fayuan Luo, Shenglian Xie, Gengxin Zeng, Guangming Fan, Changzheng eng Research Support, Non-U.S. Gov't Netherlands 2009/10/30 J Hazard Mater. 2010 Mar 15; 175(1-3):187-92. doi: 10.1016/j.jhazmat.2009.09.147. Epub 2009 Oct 3"