102 
is a further confirmation that chlordane pollution in Europe is mainly a problem 
in cold remote areas of the Arctic due to long range transport and condensation. 
The chlordane concentrations in Arctic cod livers (Table 32) are comparable to 
those for PCB or even higher (see e.g. Table 28). 
• trans-Nonachlor contributed most to the sum concentrations (37 ± 6 %) as 
typical for most studies (see e.g. Table 31). /ran.s-Nonachlor is most persistent of the 
analysed representatives (Dearth and Hites, 1991b). Moreover, /ran.s-nonachlor has 
a higher Henry constant and is therefore more globally dispersible by atmospheric 
long range transport (Falandysz et al., 2000). 
• cis-Chlordane dominates in fish recently exposed to technical chlordane 
(Strandberg et al., 1998). Therefore, any trans-nonaclor/czs-chlordane ratio >1 
indicate long range transport from old source areas (Strandberg et al., 1998). The 
cod livers of this study had a mean ratio of 1.8 ± 0.6, which point to old sources 
and no recent chlordane input. 
• Two further chlordane compounds (MC5 and MC7) were also determined. 
They are usually not included in chlordane quantification. MC5 has similar 
concentrations as /ran.s-chlordanc and is abundant in Arctic regions (Karlsson et al., 
2000). MC5 was not detectable in any sample (limit of detection ca.2 pg/g), and 
MC7 was just above the limit of detection (ca. 1 pg/g).