About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

Environmental Geosciences (DEG)

Abstract


AAPG Division of Environmental Geosciences Journal
Vol. 3 (1996), No. 4., Pages 176-187

Comparison of Anionic and Cationic Surfactant Mobility in an Unsaturated Previous HitSoilNext Hit

Barry Allred, Ted S. Kornecki, Glenn O. Brown

Abstract

The mobility of anionic and cationic surfactants in unsaturated Previous HitsoilNext Hit is an important consideration with respect to their potential use in removing or immobilizing contaminants located above the water table. Likewise, for situations in which surfactants are unintentionally released into the Previous HitsoilNext Hit medium, mobility characteristics also need to be addressed to gauge possible adverse environmental impacts. For these reasons, transient unsaturated horizontal leaching tests were conducted to compare anionic and cationic surfactant transport characteristics in a loamy Previous HitsoilNext Hit. These experiments utilized a computer-controlled syringe pump to inject 0.025 mol/kg surfactant solutions into the inlet of a dry Previous HitsoilNext Hit column. Five anionic and five cationic surfactants were tested. Relative to the conservative behavior of Previous HitsoilNext Hit moisture movement, adsorption mechanisms reduced surfactant transport in all cases. The mobilities of the anionic surfactants varied substantially and on average were greater than that of the cationic surfactants by a factor of five, based on the distance from the column inlet to the centroid of the concentration profile. Anionic surfactants also exhibited a far more pronounced impact on moisture distribution within the Previous HitsoilNext Hit column in comparison to cationic surfactants. The results of this study serve as a meaningful guide in assessing the behavior of anionic and cationic surfactants in the unsaturated Previous HitsoilTop environment.


Pay-Per-View Purchase Options

The article is available through a document delivery service. Explain these Purchase Options.

Protected Document: $10
Internal PDF Document: $14
Open PDF Document: $24