Composition and Structure of Agents Responsible for Development of Water Repellency in Soils following Oil Contamination

Soil from the Ellerslie site of experimental oil contamination in Alberta developed water repellency some years after initial remediation. The water-repellent soils were compared to clean soils and contaminated but wettable soils by solid-state nuclear magnetic resonance (NMR). The effects of extrac...

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Bibliographic Details
Published in:Environmental science & technology 2003-07, Vol.37 (13), p.2883-2888
Main Authors: Litvina, Marina, Todoruk, Tiona R, Langford, Cooper H
Format: Article
Language:English
Subjects:
Applied sciences
Decontamination. Miscellaneous
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Environmental Pollution - prevention & control
Exact sciences and technology
Geochemistry
Magnetic Resonance Spectroscopy
Petroleum
Pollution
Pollution, environment geology
Soil and rock geochemistry
Soil and sediments pollution
Soil Pollutants - analysis
Solubility
Spectroscopy, Fourier Transform Infrared
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Summary:Soil from the Ellerslie site of experimental oil contamination in Alberta developed water repellency some years after initial remediation. The water-repellent soils were compared to clean soils and contaminated but wettable soils by solid-state nuclear magnetic resonance (NMR). The effects of extraction with CH2Cl2 (for petroleum hydrocarbons), NaOH (for natural organic matter), and 2-propanol/ammonia (IPA/NH3) on wettability were evaluated by the molarity of the ethanol droplet (MED) test. Soil extracts and whole soils, after extraction, were examined using NMR and Fourier transform infrared spectroscopy (FTIR). On the basis of the structure−MED correlations, a model of a thin-layer natural organic matter−petroleum products complex formed under strong drying conditions is proposed to account for the development of water repellency. Studies of two similar soils from accidental oil spills are supportive.
ISSN:0013-936X
1520-5851
DOI:10.1021/es026296l