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Water Res

Title:		Effects of organic solutes properties on the volatilization processes from water solutions
Author(s):		Lee CK; Chao HP; Lee JF;
Address:		"Department of Environmental Engineering, Van-Nung Institute of Technology, Chung-Li 320, Taiwan, ROC. anthony@cc.vit.edu.tw"
Journal Title:		Water Res
Year:		2004
Volume:		38
Issue:		2
Page Number:		365 - 374
DOI:		10.1016/j.watres.2003.10.009
ISSN/ISBN:		0043-1354 (Print) 0043-1354 (Linking)
Abstract:		"Effects of organic solutes properties, including Henry's law constant (H), molecular weight (M), molar volume at normal boiling point (Vb), and solubility (S), on the usefulness of rate estimation by reference to a reference substance (i.e., reference substance concept) and on the evaporation rate were investigated by measuring the volatilization rate constant of organic solutes under different environmental conditions, including mixing and surfactants. It was found that if benzene was used as a reference substance, the ratio of the solute rate to that of benzene (F) becomes insensitive to water mixing, whether the solute possessed high or low Henry's law constant. In the presence of surfactants, however, the F value changes sharply as the solute solubility decreases. For benzene, toluene, ethylbenzene, and xylenes (BTEX), the F values are essentially constant irrespective of the presence of other chemicals (including organic compounds, surfactants, and salinity) and of the variation in temperature. On the other hand, the volatilization rates are closely related to molecular weight (solubility) in the existence of mixing (surfactants). Three different approaches, i.e., mass-transport theory, modified Knudsen equation, and reaction rate concept, were used to evaluate the dependence of solute volatilization rates on solute properties. It was concluded that the interaction between solute properties and environmental parameters might play a key role in the volatilization process of organic solutes under different environmental conditions"
Keywords:		"Molecular Weight Organic Chemicals Reference Values Solubility Volatilization *Waste Disposal, Fluid *Water Pollutants, Chemical;"
Notes:		"MedlineLee, Chung-Kung Chao, Huan-Ping Lee, Jiunn-Fwu eng England 2003/12/17 Water Res. 2004 Jan; 38(2):365-74. doi: 10.1016/j.watres.2003.10.009"