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Volatilization of the pesticides chlorpyrifos and fenpropimorph from a potato crop

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Author: Leistra, M. · Smelt, J.H. · Hilbrand Weststrate, J. · Berg, F. van den · Aalderink, R.
Institution: TNO Bouw en Ondergrond
Source:Environmental Science and Technology, 1, 40, 96-102
Identifier: 239084
Keywords: Geosciences · Aerodynamics · Energy utilization · Meteorology · Pesticides · Vaporization · Daylight · Plume dispersion · Potato crops · Crops · chlorpyrifos · fenpropimorph · pesticide · pesticide · volatilization · aerodynamic profile · air analysis · article · bioaccumulation · crop · energy balance · field experiment · meteorology · nonhuman · pesticide spraying · plant leaf · plume dispersion · potato · relaxed eddy accumulation · sunlight · volatilization · Agriculture · Air Pollutants · Chlorpyrifos · Environmental Monitoring · Morpholines · Pesticides · Plant Leaves · Solanum tuberosum · Sunlight · Time Factors · Volatilization · Farm Crops · Pest Control · Solanum tuberosum


Volatilization of pesticides from crops in the field can be an important emission pathway. In a field experiment with characterization of meteorological conditions, the pesticides chlorpyrifos and fenpropimorph were sprayed onto a potato crop, after which concentrations in the air and on/in the plants were measured. Rates of volatilization were estimated with the aerodynamic profile (ADP), energy balance (EB), relaxed eddy accumulation (REA), and plume dispersion (PD) methods. The volatilization rates obtained with the ADP and EB methods were similar, while some rates obtained with the REA and PD methods in the initial period were lower. Cumulative volatilization of chlorpyrifos during daylight hours (ADP and EB methods) was estimated to be about 65% of the dosage. By far the majority of this volatilization occurred in the first few days. Competing processes at the plant surface had a considerable effect on the dissipation of fenpropimorph, so cumulative volatilization during daylight hours was estimated to be only 7% of the dosage. Plant surface residues were higher than would correspond with the volatilization rate, indicating that penetration into the leaves had occurred. © 2006 American Chemical Society.