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Relationship between Water Repellency and Native and Petroleum-Derived Organic Carbon in Soils

J. L. Roy*,a, W. B. McGillb, H. A. Lowenc and R. L. Johnsond

a Imperial Oil Resources, Research Centre, 3535 Research Rd. N.W., Calgary, AB, Canada T2L 2K8
b College of Science and Management, Univ. of Northern British Columbia, 3333 University Way, Prince George, BC, Canada V2N 4Z9
c Matrix Solutions Inc., 230, 319-2 Avenue S.W., Calgary, AB, Canada T2P 0C5
d Alberta Research Council, P.O. Box 4000, Vegreville, AB, Canada T9C 1T4



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  		Fig. 1. Median molarity of ethanol droplet (MED) index, dichloromethane-extractable organics (DEO) content, and total organic carbon (TOC) content for profile soil samples from test (solid) and control soil pits (hatched) (n = 119).

 


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  		Fig. 2. Median total organic carbon (TOC) content of water-repellent (molarity of ethanol droplet [MED] > 0 M, dichloromethane-extractable organics [DEO] < 30 000 mg kg-1) (solid), and control adjacent soil (MED = 0 M, DEO < 1000 mg kg-1) (hatched) (n = 103).

 


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  		Fig. 3. Median dichloromethane-extractable organics (DEO) content of water-repellent (molarity of ethanol droplet [MED] > 0 M, DEO < 30 000 mg kg-1) (solid) and control adjacent soil (MED = 0 M, DEO < 1000 mg kg-1) (hatched) (n = 316).

 


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  		Fig. 4. Relationship between total organic carbon (TOC) and dichloromethane-extractable organics (DEO) content in control adjacent soil (control soil pits, molarity of ethanol droplet [MED] = 0 M, DEO < 1000 mg kg-1) (n = 40).

 


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  		Fig. 5. Relationship between molarity of ethanol droplet (MED) index and dichloromethane-extractable organics (DEO) content in water-repellent soil (MED > 0 M) with DEO < 30 000 mg kg-1. (a) Profile samples (n = 46). (b) Grid samples (n = 94). (c) Combined profile and grid samples (n = 140).

 




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