In situ investigation of 1,2-dibromoethane sorption/desorption processes on clay mineral surfaces by diffuse reflectance infrared spectroscopy

Sorption/desorption process for 1,2-dibromoethane (EDB) at clay surfaces were investigated in situ by means of diffuse reflectance infrared spectroscopy. The spectral results indicated the presence of EDB in two conformations, anti and gauche, within a liquid phase. The relative abundance of the two...

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Published inEnvironmental science & technology Vol. 26; no. 2; pp. 329 - 335
Main Authors Aochi, Yukiko O, Farmer, Walter J, Sawhney, Brij L
Format Journal Article
LanguageEnglish
Published American Chemical Society 01.02.1992
Subjects
ANALYTICAL METHODS
CLAY MINERALS
DESORCION
DESORPTION
DIBROMOETHANE
DIBROMURO DE ETILENO
ESPECTROSCOPIA INFRARROJA
ETHYLENE DIBROMIDE
INFRARED SPECTROPHOTOMETRY
MINERAL ARGILEUX
MINERALES DE ARCILLA
POLLUTION DU SOL
POLUCION DEL SUELO
SOIL POLLUTION
SORCION
SORPTION
SPECTROSCOPIE INFRAROUGE
TECHNIQUE ANALYTIQUE
TECNICAS ANALITICAS
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Summary:Sorption/desorption process for 1,2-dibromoethane (EDB) at clay surfaces were investigated in situ by means of diffuse reflectance infrared spectroscopy. The spectral results indicated the presence of EDB in two conformations, anti and gauche, within a liquid phase. The relative abundance of the two conformers was a function of sorption or desorption time as well as the particular clay used as the sorbent. The abundance of the gauche conformer, however, was consistently higher during both phases of the experiment, indicating preferential retention of this conformer. A conceptual model of a clay as a dielectric medium is presented to explain these results.
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ISSN:0013-936X
1520-5851
DOI:10.1021/es00026a013