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).