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Gas chromatograms of oil sampled off Santa Barbara revealed individual compounds in the oil (the red peaks). Chromatograms from the surface slick oil (top) and the seafloor sediments (middle) show nearly an exact match of compounds, confirming that the oil in the sediments comes from natural oil seeps. The bottom chromatogram is of oil from the Exxon Valdez spill. It is clearly identifiable because it does not contain a compound called bisnorhopane (BNH).
(Chromatograms by Bob Nelson, Woods Hole Oceanographic Institution)
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Posted: May 14, 2009
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