14 

 TABLE 5. Recovery of C following long term incubation with sediment 



collected at Aber Wrac'h, March 1979 



14 

 1- C-Heptadecene 



(9.7) 

 (5.1) 



Unpurified Radioisotope 

 Repurified Radioisotope 



chamber sealed under a H„ + CO atmosphere. As shown in Table 6 these 

 incubatioiL conditions did not prevent the slow, albeit variable, gener- 

 ation of CO.. 



Effects of Oiling on Anaerobic Process 



Evidence for effects due to AMOCO CADIZ oiling was first sought by 

 comparing anaerobic processes at sites oiled or not oiled by this 

 spill. Sulfate reduction dominated methane production at all sites 

 (the ratio of sulfate reduction rate to the sum of sulfate reduction 

 and methane production rate ranged from 0.951-0.998, even though me- 

 thane production may have been overestimated). Thus, major changes in 

 the type of terminal process were not evident during the period of our 

 experimentation. The potential use of acetate by either of these two 



175 



