194

all  sediment  samples  from  the  German  Bight,  it  was  found  at  some  stations  in  the
western  Baltic  Sea.
Endosulfan  I  was  determined  at  concentrations  between  <10  and  200  ng/kg  dw  with  a
median  of  20.5  ng/kg.  As  about  60  %  of  the  determinations  were  <  LOD,  the  data  can
only  be  interpreted  to  a  limited  extent.
The  spatial  distribution  in  the  German  Bight  and  western  Baltic  Sea  is  shown  in  Figure
42.  In  the  German  Bight,  Endosulfan  I  was  only  detected  at  stations  having  higher  silt
levels  and  TOC  values  above  3  mg/g.  Surprisingly,  even  at  station  KS  11  which  usually
has  the  highest  contamination  levels,  the  measured  values  were  21  ng/kg  dw  or  less.  The
limited  data  set  does  not  allow  a  statistically  relevant  interpretation  of  the  geographical
distribution  with  respect  to  spatial  gradients  or  input  structures.

4  5  6  7  8  9  10  11  12  13  14  15

Figure  42:  Endosulfan  I  concentrations  [ng/kg  dw]  in  surface  sediments  (0-2  cm)

In  the  western  Baltic  Sea,  concentrations  were  higher  than  in  the  German  Bight,  and
there  were  more  locations  with  positive  findings.  Whether  this  is  due  to  the  generally
higher  TOC  values  in  the  Baltic  or  to  local/regional  input  sources  cannot  be  ascertained
on  the  basis  of  the  limited  data  available.  However,  it  is  remarkable  that  in  the  vicinity
of  stations  having  elevated  endosulfan  concentrations  in  water  (4.3.1),  endosulfan  levels