183 
Figure 36: Chlorpyrifos-ethyl concentrations [pg/L] in surface water (5 m) in 2003 
No seasonal influence on chlorpyrifos levels was observed in the investigations. During 
two cruises in February 2004 and January 2005, median concentrations of 39 and 13 
pg/L, respectively, were found. 
6.4.1.2 Sediment 
Chlorpyrifos was determined in 30 surface sediment samples from the North Sea and 
Baltic Sea which had been collected during 6 cruises in 2003 to 2005 (Table 87,