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Titolo:
Effect of water saturation on retardation of groundwater contaminants
Autore:
Maraqa, MA; Wallace, RB; Voice, TC;
Indirizzi:
Michigan State Univ, Dept Civil & Environm Engn, E Lansing, MI 48824 USA Michigan State Univ E Lansing MI USA 48824 Engn, E Lansing, MI 48824 USA United Arab Emirates Univ, Dept Civil Engn, Al Ain, U Arab Emirates UnitedArab Emirates Univ Al Ain U Arab Emirates l Ain, U Arab Emirates
Titolo Testata:
JOURNAL OF ENVIRONMENTAL ENGINEERING-ASCE
fascicolo: 8, volume: 125, anno: 1999,
pagine: 697 - 704
SICI:
0733-9372(199908)125:8<697:EOWSOR>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
ORGANIC-CHEMICALS; NONEQUILIBRIUM TRANSPORT; SORPTION; SOILS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Engineering, Computing & Technology
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Maraqa, MA United Arab Emirates Univ, Dept Civil Engn, Al Ain, U Arab Emirates United Arab Emirates Univ Al Ain U Arab Emirates ab Emirates
Citazione:
M.A. Maraqa et al., "Effect of water saturation on retardation of groundwater contaminants", J ENV ENG, 125(8), 1999, pp. 697-704

Abstract

This study is the first to report the effect of water saturation on the retardation of nonionic organic compounds under dynamic conditions. Three nonaggregated sandy soil samples, that varied in their organic carbon content but had similar grain size distributions, were utilized. Two nonionic organic compounds were used: (1) dimethylphthalate, which served as a nonvolatile compound; and (2) benzene, which was volatile. Results showed that retardation coefficients for unsaturated soils are higher than those determined when the soil is saturated. The extent of deviation in retardation between the saturated and unsaturated soils generally increased as the degree of water saturation was reduced. No functional relationship between the extent ofdeviation in the retardation coefficient and the amount of organic carbon on the soil was found. When normalized to the saturated solid-to-water ratio, retardation coefficients for dimethylphthalate determined at different degrees of saturation were similar, leading to the conclusion that the distribution coefficient did not increase as the media was desaturated. Volatilization did not significantly affect the retardation of benzene under the employed range of saturation. Theoretical analysis showed that the impact would be significant for volatile compounds with higher Henry's coefficients and in aquifers with low organic matter content. Diffusive transport in the air phase had a significant impact on the spreading of benzene. Previously developed empirical relations reasonably predicted this impact.

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Documento generato il 10/04/20 alle ore 01:42:02