| Abstract
| - Soil from the Ellerslie site of experimental oil contaminationin Alberta developed water repellency some years afterinitial remediation. The water-repellent soils were comparedto clean soils and contaminated but wettable soils by solid-state nuclear magnetic resonance (NMR). The effectsof extraction with CH2Cl2 (for petroleum hydrocarbons),NaOH (for natural organic matter), and 2-propanol/ammonia(IPA/NH3) on wettability were evaluated by the molarityof the ethanol droplet (MED) test. Soil extracts and wholesoils, after extraction, were examined using NMR andFourier transform infrared spectroscopy (FTIR). On the basisof the structure−MED correlations, a model of a thin-layer natural organic matter−petroleum products complexformed under strong drying conditions is proposed toaccount for the development of water repellency. Studiesof two similar soils from accidental oil spills are supportive.
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