23 
81 % of C^-constituents. The content of C\e chains length was maximum 12% in 
mPCAs. 
Differences were found between marine and river sediments as well as suspended 
particulate matter (SPM). The chlorine content of sPCAs was lower in marine sediments 
(51-59 %) than in river sediments/SPM (58-63 %). Main compounds in all sediment 
types were Cn and Cn chains with 7-8 Cl. However, the fraction of Cn compounds 
was somewhat lower in marine sediments (19-34%) than in river sediments/SPM (24- 
43 %). Moreover, the chlorine content of mPCAs and their composition was comparable 
for both sea and river sediments as well as SPM. 
2.1.8 PCA in sea water 
Only two sea water samples were analysed due to the expected very low concentrations. 
Samples of 100 1 were taken and extracted. No PCAs could be detected by EI-MS/MS at 
a detection limit of 0.4 ng/1 water, which corresponds to an absolute detection limit of 
0.2 ng for the most abundant fragmentation. 
2.1.9 Chlordanes in biota from the Baltic and North Seas and the 
northern North Atlantic 
Sum concentrations (Echlordane) on lipid weight basis (11-47 ng/g lw) were 
comparable to other studies of fish from the Baltic and North Sea. No significant 
concentration difference (t-test) was observed between the Baltic (Echlordane 11.3 ±5.1 
ng/g ww) and the North Sea (10.4 ± 6.0 ng/g ww) or between the two measuring 
campaigns. However, compared to cod liver from the Lofot Islands, the chlordane 
compound level in the North and Baltic Sea was about one order of magnitude lower. 
/ran.v-Nonachlor contributed most to the sum concentrations (37 ± 6 %) as it is typical 
for most studies. cis-Chlordane dominates in fish recently exposed to technical 
chlordane. Therefore, any trans-nonachlor/cis-chlordane ratio >1 indicate no new and 
recent chlordane input. The cod livers of this study had a mean ratio of 1.8 ± 0.6, which