Gas-chromatographic studies of sorptive interactions of normal and halogenated hydrocarbons with water-modified soil, silica, and Chromosorb W

Abstract

Gas chromatography with wetted soil columns has been used to determine the retention mechanism of pesticides and halogenated methanes (used as soil fumigants). The principal modes of interaction with the wetted soils include adsorption on the water surface and absorption by the water layer. The equilibrium

Adsorption of a Diverse Set of Organic Vapors on Quartz, CaCO3, and α-Al2O3 at Different Relative Humidities

“…At relative humidity above 90% absorption into the adsorbed water film may also become important depending on the polarity of the sorbing compound (2). This is also corroborated by the work of others (4,5).…”

“…For many practical purposes, Eq. [4] with the fitted surface parameters describes the compound variability in the adsorption constants sufficiently well. However, the quality of the fits is significantly poorer than that in linear free energy relationships that have been used for absorptive partitioning (28)(29)(30)(31)(32).…”

“…Hence, Eq. [4], which is the general form of Eq. [3], should hold for the adsorption of any organic compound on any other surface at 15…”

“…[4] was validated with literature data for compounds and surfaces that interact only by van der Waals forces. Here, we have fitted Eq.…”

Pollutant Removal from Wood and Coal Flue Gases by Soil Treatment

“…The specific retention volume, as a first approximation, equals the partition coefficient 14 and is an index of the soil's ability to adsorb gases. The partition coefficient decreases with soil moisture content 15 but, even if the partition coefficient decreased thousandfold from dry to field moisture contents, passage through 10 cm of soil would remove more than 99% of the benzene content of air. The first 20 cm of travel would remove more than 99.9% of the benzene.…”