Infrared investigation of the sequestration of toluene vapor on clay minerals
Resource
Environmental Toxicology and Chemistry 22 (9): 1956-1962
Journal
Environmental Toxicology and Chemistry
Journal Volume
22
Journal Volume
22
Journal Issue
9
Journal Issue
9
Pages
1956-1962
Start Page
1956
End Page
1962
ISSN
07307268
Date Issued
2003-09
Date
2003
Author(s)
Chang, Meei-Ling
Wu, Shian-Chee
Cheng, Shu-Chun
Abstract
The Ca-exchanged clays were used to investigate the sorption of toluene under both high and low relative humidity conditions. According to the observed rates of sorption and desorption and the Fourier transform infrared (FTIR) spectra of sorbed toluene, the sorbate molecules on clays can be divided into three categories: labile (gaslike) phase, slow sorption (liquidlike) phase, and resistant-to-desorption phase with sorption/desorption time scales of less than 30 min, several hours, and several weeks, respectively. Aging changed the spectroscopic characteristics of the sorbed sorbates and contributed to the irreversibility of the sorption under both high and low relative humidity. Irreversibly sorbed portions of the sorbates and new characteristic peaks identified with FTIR spectrometry suggest the existence of chemical transformation of sorbed species under both high and low relative humidity conditions. It is suggested that the clay minerals, acting as catalysts, may contribute to abiotic natural attenuation of volatile organic aromatic hydrocarbons in soils.
Subjects
Aging
Chemicaltransformation
Clays
Sorption/desorption
Toluene
Type
journal article
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