185 
Concentrations in sediment are low in comparison with classical pollutants. At KS 11, 
for example, HCH isomers ranged from 0.01 to 0.2 pg/kg. The more lipophilic DDD 
and CB153 ranged from 1 to 5 pg/kg dw. PAHs like, e.g., BaP showed sediment 
concentrations of 40 to 240 pg/kg dw. 
6.4.1.3 Biota 
25 liver samples of three different fish species (dab (Limanda limanda), cod (Gadua 
morhua) and flounder (Platichtys flesus)) were examined, which had been collected 
during two cruises in the North Sea and western Baltic Sea in 2001 and 2002. (Table 88, 
Appendix 6.6.8) 
Chlorpyrifos-methyl was below the LOD in most samples. 
Chlorpyrifos-ethyl in most samples was found at concentrations from 0.1 to 3.4 pg/kg 
wet weight (0.3 to 13 pg/kg lipid weight), with a median of 0.6 pg/kg ww (2.77 pg/kg 
lw). The geographical distribution of the samples and their concentrations are shown in 
Figure 38. Variability of the data may be considered normal. Because of the limited data 
set presently available it is not possible to evaluate the results under the aspect of 
regional patterns, species differences, or time variability. Therefore, it is not possible 
presently to comment on the significance of the higher values found in the western 
Baltic Sea. 
The estimated “enrichment” of chlorpyrifos-ethyl in biota compared to the water phase 
is approximately 10 4 to 10 5 . 
The chlorpyrifos values observed are on the same order as classical pollutants like HCH 
and HCB; they are, however, below the levels of the very lipophilic DDT and PCB 
group. In 2000, typical HCH concentrations in the German Bight ranged from 0.2 to 0.6 
pg/kg ww; HCB had a median of 0.84 pg/kg ww, and the sum of DDTs had a median of 
3.7 pg/kg ww (BSH, 2005).