Jong APJM de ,
Berg S van den ,
Liem AKD ,
Berg R van den ,
Klooster HA van 't
English Abstract This report describes the results of the analysis of
dioxins in soil samples from five pasturs in the Lickebaert-area and of two
pastures as reference locations in Bergambacht, The Netherlands. Samples
consisted of a great number os subsamples of the layers 0-1, 1-2 and 2-10 cm
below the surface. In addition, of two fields the layer of 10-25 cm below
the surface has been examined. The main results and conclusions are: 1.
Dioxin levels based on dry matter of the toplayer of 0-10 cm of five
pastures in the Lickebaert-area varied between 18+-3 and 51+-9 with a mean
of 27+-13 ng TEQ/kg of dry soil. Corrected for organic carbon content of
the soil, the level in four pastures B, C, D and H were in good agreement.
The mean level was 220+-20 ng TEQ/kg of organic carbon. At point K this
level was significatnly lower (130+-30) and also for the reference locations
(mean for R and S 44+-30 ng TEQ/kg organic carbon) 2. Dioxins appeared to
be uniformly distributed over the upper layer of 0-2 cm contained various
amount of dioxins on the basis dry soil. The mean level was approximately
half of that of the upper layer. When corrected for the organic carbon
content of the soil, levels in this layer were not significantly different.
The layer of 10-25 cm contained dioxins at a level below 1 ng TEQ/kg dry
soil. 3. the dioxin level in the surface layer of one field (H, 51 ng
TEQ/g dry soil) was approximately twice that of the other four fields
investigated. However, on the basis of organic carbon, this level was close
to that of B, C and D. 4. There is as yet no clear relation found between
the dioxin level in soil and the dioxin level in cow's milk from the same
dairy farm. However, the lowest level in soil fits with the lowest level in
milk for dairy farm K and the references R and S.