Relationship between pelagic tar,fluorescence and biological markers in the South Atlantic Ocean |
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Authors: | Mahlon C Kennicutt James M Brooks |
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Institution: | Department of Oceanography, Texas A&M University, College Station, TX 77843, USA |
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Abstract: | Surface pelagic tar concentrations in the equatorial South Atlantic Ocean were low (< 0.001 to 14.6 mg m?2). With one exception, concentrations were less than 0.5 mg m?2. The tars were characterized by gravimetry, carbon isotopic composition, molecular compositions (gas chromatographically), sulphur content, total fluorescence spectra, and biological marker fingerprints. Most tars exhibited significant amounts of degradation. A total fluorescence technique was used to group the tars into two basic types. One type occurred at low concentrations and appeared to be due to chronic long-term oil pollution in the South Atlantic Ocean. The second group occurred at much higher concentrations and was associated with more coastal-influenced waters. Biological marker (triterpanes and steranes) fingerprints confirmed the fluorescence groupings. Carbon isotopic composition and pristane/phytane ratios exhibited few geographical trends. |
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