The unresolved complex mixture (UCM) was quantified using planimetry 

 according to published procedures of Boehm and Quinn (1978) and Farrington 

 and Quinn (1973), and relating its area to that of the internal standard 

 through an integration unit to planimeter unit conversion factor. 



Combined glass capillary gas chromatography/mass spectrometry was 

 performed on a Hewlett-Packard 5985 GC/MS/computer system for peak 

 identifications and quantifications, using selected ion monitoring. 

 GC/MS was used primarily as a tool for investigating aromatic (f~) 

 hydrocarbon fraction contents of a selected set of tissue and sediment 

 trap samples. 



Quantitative GC/MS was performed on selected aromatic hydrocarbon 

 samples, GC/MS response factors were computed by examining the instru- 

 mental response of a given amount of aromatic standard relative to that 

 for the internal standard (hexaethyl benzene). Response factors for 

 components for which no authentic standards were available (e.g. C^ 

 phenanthrene, C and C fluorenes, C and C dibenzothiophenes) were 

 computed by extrapolation from the factors for parent and monomethylated 

 compounds. Total ion currents for parent (M ) peaks were obtained for 

 each component of interest, relative response factors applied, and 

 converted to concentration units by comparison to the internal standard 

 amount . 



11.3 Results 



11.3.1 Mytilus edulis 



All of the stations in the littoral zone were sampled from the time 

 of the spill event through early May 1978. In addition, two of the 

 stations C and D, along the eastern shoreline, and one near the spill 

 off Fifong Island (G) were sampled prior to landfall of the oil (base- 

 line samples) and through October of 1978. Results of these analyses 

 are presented in Tables 11.1 through 11.4. 



11.3.1.1 Aliphatic Hydrocarbons 



The data in Table 11.1 document a very rapid uptake of Tsesis oil 

 by the littoral bivalve Mytilus . Aliphatic hydrocarbon concentrations 



225 



