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- W2082567997 abstract "On-line Fourier transform infrared (FT-IR) spectroscopy was applied to monitor the concentration of halogenated volatile organic compounds in a sample-preparation process that simulates long-term, slow accumulation of contaminants in soils (i.e., aging). Artificial aging is conducted by circulating a supercritical fluid solution containing the contaminant(s) of interest through a packed soil column. Mid-infrared spectra of several volatile halocarbons were measured in supercritical Xe and CO 2 to evaluate possible interferences from the strong absorption of CO 2 . Although some of the C–X bands were partially masked in supercritical CO 2 , all of the compounds studied had distinct spectral features in the region 1400–700 cm −1 and could be monitored in either solvent. Quantitative measurements of halogenated volatile organics in supercritical CO 2 were demonstrated with CCl 4 . Excellent results were obtained over the range 7–280 mM. Representative artificial aging experiments were conducted on two test soils using CCl 4 as the contaminant. On-line (FT-IR) estimates of the aged soil concentrations were 1.3–4.4 times higher than off-line concentrations obtained by gas chromatography/mass spectrometry. The discrepancies were primarily ascribed to post-aging losses that occurred during depressurization and subsequent sample handling. FT-IR spectroscopy is shown to be a powerful tool for monitoring soil loading behavior and for developing artificial aging protocols." @default.
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- W2082567997 date "2006-08-01" @default.
- W2082567997 modified "2023-09-26" @default.
- W2082567997 title "Quantification of Volatile Organics in Soil Aging Experiments Using Fourier Transform Infrared Spectroscopy" @default.
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- W2082567997 doi "https://doi.org/10.1366/000370206778062156" @default.
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