. Ecological study of the Amoco Cadiz oil spill : report of the NOAA-CNEXO Joint Scientific Commission . SULFATE REDUCTION RATE (pmoles S04=' mf'-day"1* Figure 8. Depth profiles for rates of sulfate reduction in oiled and control sediments. Bars indicate one standard deviation. To more directly observe the effect of oiling on microbial activi- ties in sediments, AMOCO CADIZ mousse was added to lie Grande sedi- ments, and activities compared between mousse-treated and untreated sediments. Gas chromatograms of the saturate and aromatic fractions of this mousse are shown in Figures 9 and 10,
. Ecological study of the Amoco Cadiz oil spill : report of the NOAA-CNEXO Joint Scientific Commission . SULFATE REDUCTION RATE (pmoles S04=' mf'-day"1* Figure 8. Depth profiles for rates of sulfate reduction in oiled and control sediments. Bars indicate one standard deviation. To more directly observe the effect of oiling on microbial activi- ties in sediments, AMOCO CADIZ mousse was added to lie Grande sedi- ments, and activities compared between mousse-treated and untreated sediments. Gas chromatograms of the saturate and aromatic fractions of this mousse are shown in Figures 9 and 10, respectively. These tracings can be compared to fresh light Arabian Crude in Figures 9 and 10. In the saturate fraction of the mousse, no hydrocarbons below C-12 were detected. In the aromatic fraction all predominant compounds were gone and only a UCM remained. Thus, extensive weathering of the low mole- cular weight compounds in the mousse had occured before collection. Extensive biodegradation of aliphatic compounds was not suggested as evidenced by the dominance of normal compared to isoprenoid alkanes. 177
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