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Résumé :
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Five different crude oils, two residual fuel oils and one distillate fuel oil were subjected to simulated weathering in the laboratory. Samples were weathered for 10 and 21 days at 55 and 80° F, under high and low salt water washing rates. "Weathered" and "unweathered" oil samples were analyzed by low voltage mass spectroscopy (polynuclear aromatics), high voltage mass spectroscopy (naphthenes), gas chromatograph (n-paraffins), emission spectroscopy (nickel, vanadium), X-ray total sulfur and Kje1dah1 total nitrogen techniques. Several compound indices were adequately stable toward simulated weathering to discriminate between like and unlike pairs of oils. Discriminant function analysis was used to select the best compound indices for the oils used. Using these indices, weathered and unweathered samples were correctly paired with high statistical confidence.
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