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Chemosphere

Title:		Column study of the influence of air humidity on the retention of hydrocarbons on soil
Author(s):		Garcia-Herruzo F; Rodriguez-Maroto JM; Garcia-Delgado RA; Gomez-Lahoz C; Vereda-Alonso C;
Address:		"Departmento de Ingenieria Quimica, Facultad de Ciencias, Universidad de Malaga, Spain. Herruzo@uma.es"
Journal Title:		Chemosphere
Year:		2000
Volume:		41
Issue:		8
Page Number:		1167 - 1172
DOI:		10.1016/s0045-6535(00)00012-6
ISSN/ISBN:		0045-6535 (Print) 0045-6535 (Linking)
Abstract:		"Inverse gas chromatography (IGC) is used for the analysis of the influence of air relative humidity on the retention of hexane, benzene, toluene and p-xylene in a sandy soil under experimental conditions similar to those typical of soil vapor extraction (SVE). The advantages of IGC over other techniques, are (a) an efficient use of lab resources, (b) a high sensitivity to low partitioning coefficients and (c) a closer reproduction of field conditions. In our procedure, experiments with only two samples of different mass are necessary to establish if linear isotherms can be used to describe the retention of the contaminants. This approach gives information necessary for analyzing the feasibility and design of remediation technologies with a laboratory effort significantly smaller than the adsorption/desorption cycle for isotherm determination. The retention coefficients of the contaminants decrease as humidity increases in a similar fashion for all of them, probably because the reduction in the number of the adsorption sites available for the organic compounds due to the presence of water is quite similar for all the contaminants studied. These retention coefficients may be related to those obtained for dry air conditions for all the contaminants through (R - 1)RH% = A(R - 1)dry air(B), where the parameter B is found to remain approximately constant (0.90), while the parameter A decreases linearly with the relative moisture"
Keywords:		"Adsorption Chromatography, Gas/methods Humidity Hydrocarbons/*pharmacokinetics Soil Pollutants/*pharmacokinetics Volatilization;"
Notes:		"MedlineGarcia-Herruzo, F Rodriguez-Maroto, J M Garcia-Delgado, R A Gomez-Lahoz, C Vereda-Alonso, C eng Research Support, Non-U.S. Gov't England 2000/07/20 Chemosphere. 2000 Oct; 41(8):1167-72. doi: 10.1016/s0045-6535(00)00012-6"