English Abstract Since april 1988 wet-only samplers are operational in
the Netherlands Precipitation Chemistry Network. During 1988 and 1989 on 4
(out of 14) locations of the network both wet-only and bulk samplers were
used for comparison purposes. In the course of 1988 it became clear that
the wet-only samplers used in the network could contaminate precipitation
samplers with respect to zinc. An evaluation of the results made clear that
zinc contamination took place during the first 6 months of the
investigations ; probably also contamination effect diminished in time and
could not be detected anymore after the periods given above. The source of
contamination is the material used in the production process of the funnels.
Figures for the wet deposition of cadmium in the Netherlands in 1988 were
estimated 25% too high at the utmost. Figures for the zinc deposition in
1988 have not been published, because suggestions for contamination were
obtained already during 1988.
