Abstract
Decrease of an organophosphorus insecticide, Fenitrothion, dispersed by a helicopter was determined daily in paddy fields and a surrounding river by using reversed phase adsorption liquid chromatography. Fenitrothion was found to be at a level of 554 ppb in a paddy field immediately after the dispersion, and then decreased exponentially with time. The level reduced to 5 ppb after 3 days of the dispersion. By dispersing Fenitrothion, a crustacean Moina sp. prevalent in paddy fields was noticed to disappear immediately, but its population density was regained within 10 days after the dispersion. Planktonic algal growth was stimulated by the Fenitrothion dispersion.
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