Ecological study of the Amoco Ecological study of the Amoco Cadiz oil spill : report of the NOAA-CNEXO Joint Scientific Commission ecologicalstudyo00noaa Year: 1982 14 99) from New England Nuclear; n-[l- C]-hexadecane, 54 mCi/mmole (97- 99), [1(4, 5, 8)- C]-naphthalene, 5 mCi/mmole (97-98), [U- C]-ben- zene, 101 mCi/mmole (98-59), [7, 10- C]-benzo(a]pyrene, mCi/m mole, (99), and [methyl- C]-toluene, 30 mCi/mmole (96-99) from Awer- sham Corp.; n-[l- C]-heptadecane, 16 mCi/mmole (>99), and [1- C]- heptadecene, mCi/mmole (97) from ICN. AMOCO CADIZ mousse was obtained from the NOAA N
Ecological study of the Amoco Ecological study of the Amoco Cadiz oil spill : report of the NOAA-CNEXO Joint Scientific Commission ecologicalstudyo00noaa Year: 1982 14 99) from New England Nuclear; n-[l- C]-hexadecane, 54 mCi/mmole (97- 99), [1(4, 5, 8)- C]-naphthalene, 5 mCi/mmole (97-98), [U- C]-ben- zene, 101 mCi/mmole (98-59), [7, 10- C]-benzo(a]pyrene, mCi/m mole, (99), and [methyl- C]-toluene, 30 mCi/mmole (96-99) from Awer- sham Corp.; n-[l- C]-heptadecane, 16 mCi/mmole (>99), and [1- C]- heptadecene, mCi/mmole (97) from ICN. AMOCO CADIZ mousse was obtained from the NOAA National Analytical Facility and was collected at Ploumanach on April 30, 1978 (44 days after the spill). Light Arabian crude oil (SX//0308) was obtained from Exxon Corp., Baytown, Texas. The crude oil was weathered by evapora- tion at 25 C for 8 and 48 h. All oil samples were stored at 4 C until used. RESULTS Physical-Chemical Comparison of Sites Beach cores consisted of medium grained sand, while estuary and marsh cores consisted of fine grained silt and clay. It was possible to determine Eh profile for muddy sediments (Fig. 3). In all sediments Eh (mv) + IOO + 200 +300 -100 SALT MARSH MUDFLATS + 100 +200 +300 -1- -£r-' ' / \ « VAW A AI / / \ ABER MUDFLATS Figure 3. Eh profiles in muddy sediments. Bars indicate the range of measurements on duplicate cores. pH increased with depth from to in He Grande, from to in Aber lldut, from to in Aber Wrac'h and from to in the lie Grande oiled site. conditions became more reducing with depth. The steepest Eh profile was observed in the He Grande oil site where a brown layer approxi- mately 2 mm thick covered black sediment. Marsh mudflat sediments 166
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