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Titre :
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Aircraft measurements of the concentration and flux of agrochemicals
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Auteurs :
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T. Zhu ;
R. Desjardins ;
J. Macpherson ;
AL Et
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Type de document :
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article/chapitre/communication
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Année de publication :
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1998
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Format :
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p. 1032-1038
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Langues:
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= Anglais
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Catégories :
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Environnement
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Mots-clés:
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PRODUIT AGROPHARMACEUTIQUE
;
PESTICIDE
;
INSECTICIDE
;
VOLATILISATION
;
CONCENTRATION
;
MESURE
;
POLLUTION DE L'AIR
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Résumé :
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To quantify and model the volatilization and deposition of the agrochemicals, measurements of the exchange rates between the atmosphere and different surfaces are required. An aircraft-based air sampling system using the relaxed eddy-accumulation technique for measuring concentrations and fluxes of agrochemicals was developed and tested in June 1993 and July 1994. Atrazine and metolachlor,which are used on corn and soybean crops, were detected in samples collected along flights from Ottawa to southern Ontario. Concentrations as high as 4.6 ng m(-3) for atrazine and 9.8 ng m(-3) for metolachlor were found. Fluxes ranged from -1.1 to 2.5 ng m(-2) s(-1) for atrazine and from -0.01 to 0.56 ng m(-2) s(-1) for metolachlor. These results demonstrate that the aircraft-based relaxed eddy-accumulation approach is a useful method for measuring concentrations and fluxes of agrochemicals at both local and regional scales.
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Source :
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Environmental science & technology, vol.32, n°8
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