Enhancement of Aqueous Solubility of Organochlorine Pesticides by Ethanol
Publication: Journal of Environmental Engineering
Volume 143, Issue 9
Abstract
Cosolvents, such as short-chain alcohols used in oxygenated fuels, have the potential to increase the aqueous solubility of hydrophobic organic chemicals. Most of the attention has been focused on compound classes such as polynuclear aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs), with comparatively little attention directed to organochlorine pesticides, despite their environmental significance. The work reported here shows increases in the aqueous solubility of dieldrin and lindane of approximately 7.5 and 3.3 orders of magnitude, respectively, as the ethanol mass fraction, , increases from 0.0 to 1.0. The relationship between the aqueous solubility of these compounds and the ethanol mass fraction differs from that of other hydrophobic compounds, requiring a two-part log-linear model, with the breakpoint occurring at for the pesticides examined. The solubility relationship is heavily influenced by cosolvent–solvent interactions, with the breakpoint occurring due to a shift in these interactions, and consequently in the solubilization mechanism.
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Acknowledgments
The authors gratefully acknowledge the support provided by Thomas Yavaraski, Laboratory Supervisor in the Department of Civil and Environmental Engineering (University of Michigan), for developing the analytical method for the GC-ECD analysis. Financial support was provided by the National Science Foundation (NSF) (CBET 1335878). The first author was supported by a NSF Graduate Research Fellowship Program (DGE 0718128). This paper has not been subject to review by the agency; it therefore does not necessarily reflect the agency’s views, and no official endorsement should be inferred.
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Published In
Journal of Environmental Engineering
Volume 143 • Issue 9 • September 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Nov 14, 2016
Accepted: Jan 26, 2017
Published online: May 12, 2017
Published in print: Sep 1, 2017
Discussion open until: Oct 12, 2017
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