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The precision and accuracy of acidification followed by Soxhlet extraction with trichlorotrifluoroethane to estimate the oil and grease content of oil-contaminated soils was determined. The amounts of oil and grease were determined gravimetrically after solvent extraction. Stock oil-soil mixtures prepared with vegetable oil, No. 2 fuel oil, No. 6 fuel oil, motor oil, and an oily waste were analyzed. The coefficient of variation for all oil-soil mixtures analyzed never exceeded 4%. The percentage of recovery varied from 68% for No. 2 fuel oil to 102% for motor oil. The results indicate that this method is precise and results in reasonable recoveries when used to measure the oils tested.
oil and grease, soil, Soxhlet extraction, trichlorotrifluoroethane, precision, accuracy, hazardous wastes
Research associate, Cornell University, Ithaca, NY
Professor of civil engineering, University of Texas, Austin, TX