Biodegradation of petroleum in two soils; implications for PAH bioavailability

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Authors:Allan, Kathy A.; Herbert, Bruce E.; Morris, Pam J.; McDonald, Tom J.
Author Affiliations:Primary:
Texas A&M University, Department of Geology and Geophysics, College Station, TX, United States
Other:
Medical University of South Carolina, United States
Volume Title:Geological Society of America, 28th annual meeting
Source:Abstracts with Programs - Geological Society of America, 28(7), p.520; Geological Society of America, 28th annual meeting, Denver, CO, Oct. 28-31, 1996. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0016-7592
Publication Date:1996
Note:In English
Summary:The effectiveness of in situ biodegradation of petroleum-contaminated environments is controlled, in part, by the subsurface geologic characteristics through their influence on contaminant sorption and bioavailability. The objective of this study was to quantify the influence of mineral surface chemistry, organic matter content, and surface area on the rate and extent of polycyclic aromatic hydrocarbon (PAH) biodegradation in petroleum-contaminated soils. Two soils were used in this study; a Vertisol (Snook, Texas) and a sand (Aiken, South Carolina). The surface chemistry of the Vertisol is dominated by permanently-charged phyllosilicates (kaolinite and smectite) and has an organic matter content of 1.5%, and a surface area of 69.3m2/g. The sand is dominated by the pH-dependent charge of iron oxides (1.8% Fe), contains only 0.02% organic matter, and has a surface area of 10.6m2/g, Biodegradation of a light crude oil was quantified in flasks containing soil slurries that varied in soil type while controlling for soil surface area, soil-to-solution ratio, oil loading, microbial inoculation and environmental conditions. Duplicate flasks at two different surface areas (250 and 500 m2) were extracted at 0, 7, 21, 36 and 58 days and analyzed for specific PAHs, aliphatic hydrocarbons, saturate biological markers, total extractable material, gross composition of the extracted hydrocarbons (% of aliphatic, aromatic, and polar compounds) and heterotrophic plate counts. The results were compared to soil-free controls and uninoculated controls. The influence of mineral surface chemistry and surface area on the extent of PAH biodegradation in the different bioreactors was statistically quantified using ANOVA techniques.
Subjects:Aliphatic hydrocarbons; Aromatic hydrocarbons; Bioavailability; Biodegradation; Clastic sediments; Controls; Hydrocarbons; In situ; Mineral composition; Organic compounds; Pollutants; Pollution; Polycyclic aromatic hydrocarbons; Quantitative analysis; Sand; Sediments; Soils; Sorption; Statistical analysis; Vertisols; Aiken County South Carolina; Aiken South Carolina; South Carolina; Texas; United States; Organic materials; Snook Texas
Coordinates:N333400 N333400 W0814400 W0814400
Record ID:1997048241
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
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