A soil-column gas chromatography (SCGC) approach to explore the thermal desorption behavior of hydrocarbons from soils

Environmental Science and Pollution Research International
Ying YuBelkacem Benadda

Abstract

A soil-column gas chromatography approach was developed to simulate the mass transfer process of hydrocarbons between gas and soil during thermally enhanced soil vapor extraction (T-SVE). Four kinds of hydrocarbons-methylbenzene, n-hexane, n-decane, and n-tetradecane-were flowed by nitrogen gas. The retention factor k' and the tailing factor T f were calculated to reflect the desorption velocities of fast and slow desorption fractions, respectively. The results clearly indicated two different mechanisms on the thermal desorption behaviors of fast and slow desorption fractions. The desorption velocity of fast desorption fraction was an exponential function of the reciprocal of soil absolute temperature and inversely correlated with hydrocarbon's boiling point, whereas the desorption velocity of slow desorption fraction was an inverse proportional function of soil absolute temperature, and inversely proportional to the log K OW value of the hydrocarbons. The higher activation energy of adsorption was found on loamy soil with higher organic content. The increase of carrier gas flow rate led to a reduction in the apparent activation energy of adsorption of slow desorption fraction, and thus desorption efficiency was significantly e...Continue Reading

References

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Aug 8, 2006·Journal of Chromatography. a·Mark Vitha, Peter W Carr
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Apr 21, 2010·Environmental Science & Technology·Haijun ZhangJiping Chen
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Mar 19, 2013·Journal of Contaminant Hydrology·Van Thinh NguyenRichard G Zytner

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Citations

Jul 21, 2021·Environmental Science and Pollution Research International·Liangliang LuZhanhuang Fan

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