24 
point to old sources and no recent chlordane exposure. The two chlordane compounds 
MC5 and MC7 were hardly or not detectable (limit of detection ca. 0.1 pg/g). 
2.1.10 Clordanes in sediments from the Baltic and North Seas and 
additional sites in Europe 
/ran.v-Nonachlor was most dominant in the majority of sediments. cis/lrans-'Nonachlor 
concentrations were about ten times higher in the Baltic Sea (0.12-0.46 ng/g dw) than in 
the North Sea (0.001-0.34 ng/g dw). cis/tran ,y - C h 1 o r danc levels were partly higher in 
the North Sea than in the Baltic Sea, when compared on a wet weight basis. It was vice 
versa expressed on TOC content. Concentrations of cis-and of trans-chlordane were 
comparable. 
Very little information about chlordane concentrations in sediments is available in the 
literature. Overall, chlordane concentrations in the sediments analysed in this project 
were within the same order of magnitude as those published. /ran.s-Nonachlor was most 
dominant in the majority of sediments. cis/lrans-'Nonach 1 or concentrations were about 
ten times higher in the Baltic Sea (0.12-0.46 ng/g dw) than in the North Sea (0.001- 
0.34 ng/g dw). cis/tran ,y - C h 1 ordanc levels were partly higher in the North Sea than in the 
Baltic Sea, when compared on a wet weight basis. It was vice versa expressed on TOC 
content. Concentrations of cis-and of trans-chlordane were comparable.