Document Detail

Aerial short-range dispersion of volatilized pesticides from an area source.
MedLine Citation:
PMID:  12194005     Owner:  NLM     Status:  MEDLINE    
Owing to legal provisions, pesticides have to be applied in such a way that there is no unacceptable influence on human health and the environment at nearby non-target areas. In order to quantify their concentration over and downwind of agricultural target plots of 0.5-1 ha, covered by winter wheat and winter barely, the pesticides lindane, parathion and pirimicarb were applied. Over these plots the post-application volatilization rates of the pesticides were estimated indirectly from vertical concentration, wind and temperature profile measurements using the aerodynamic gradient technique. Philip's advection model was applied to take non-favourable fetch conditions into account. In addition, at a height of 1.6 m downwind of the area source, measurements of the horizontal concentration profile were made up to a distance of about 250 m at roughly 50-m intervals. The monitoring started immediately after spraying in the morning and continued for about 8-10 h, thus providing a worst-case situation because volatilization, and therefore pesticide concentration in the atmospheric surface layer, is then strongest. The concentration of the airborne pesticides over the downwind non-target area was also calculated by Philip's advection model. By using the Nash-Sutcliffe relative-difference measure between observed and calculated concentrations, a goodness-of-fit of 0.97 was obtained over the downwind non-target area, indicating that the Philip model is well suited for dispersion estimates in the near-field range.
K-P Wittich; J Siebers
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Publication Detail:
Type:  Journal Article     Date:  2002-03-27
Journal Detail:
Title:  International journal of biometeorology     Volume:  46     ISSN:  0020-7128     ISO Abbreviation:  Int J Biometeorol     Publication Date:  2002 Aug 
Date Detail:
Created Date:  2002-08-23     Completed Date:  2002-12-04     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0374716     Medline TA:  Int J Biometeorol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  126-35     Citation Subset:  IM    
Deutscher Wetterdienst, Agrarmeteorologische Forschung, Bundesallee 50, 38116 Braunschweig, Germany.
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MeSH Terms
Air Pollution / prevention & control
Environmental Health
Meteorological Concepts
Models, Theoretical
Pesticides / adverse effects,  analysis*
Reg. No./Substance:

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