Long-term measurements of gamma-HCH in precipitation inthe Netherlands
2003
The results of 20 years of measuring gamma-HCH in precipitation in the
Netherlands are presented here. Analysis has revealed a systematic
seasonal behaviour, with enhanced levels of gamma-HCH in precipitation
from April through June. Evidence was found for a statistically
significant change in concentrations during the last 20 years.
Measurement results from the last three years (1999-2001) showed a clear
downward trend, suggesting a decline in lindane emissions. An evaluation
of measurement results from north-west Europe confirms the large-scale
distribution of gamma-HCH in precipitation in north-west Europe. Given
the large uncertainties in emission estimates and in modelling of
atmospheric transport and deposition, measurements are concluded to form
a better tool for monitoring the changes in environmental quality and
emissions.
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