Exposure of Workers to Fenpropathrin during and after Application in Grape Orchard.
10.2185/jjrm.44.663
- VernacularTitle:ブドウ園におけるフェンプロパトリンの散布時と散布後の作業者の曝露評価
- Author:
Yoshihiro KUWABARA
;
Shigeko UEDA
- Publication Type:Journal Article
- From:Journal of the Japanese Association of Rural Medicine
1996;44(5):663-669
- CountryJapan
- Language:Japanese
-
Abstract:
Exposure levels of workers to fenpropathrin were studied during or after the application of the insecticide in a grape orchard. One farmer applied 25 g of the pesticide as an active ingredient to the 30-are orchard for 15 min with an airblast sprayer. The operator was most exposed on his legs, back and head. Consequently, his dermal exposure level was estimated at 783 μg (=12 μg/kg of b. w.), corresponding to 0.003% of the total amount of fenpropathrin sprayed. Another worker entered the orchard for 20 min at reular intervals during the period of 9 days after application. Upon entering 1 hr after application, the farmer was exposed predominantly on his head and to a lesser extent on his arms and back, and his estimated exposure level was 272 μg (=4.7μg/kg). At the subsequent reentries, his exposure level was reduced gradually, and no trace of exposure was recognized at the 9th day. Foliar residues were worked out at about 130ng/cm2 1 to 6 hrs after application, and thereafter decreased to 14ng/cm2 at the 9th day. The dissipation of foliar residues of fenpropathrin was expressed in the following regression equation: Y (ng/cm2) =116-0.5 X (hrs). Thus, the half-life of fenpropathrin was estimated at 100 hrs on grape-leaf surfaces. Also, the dermal exposure levels of the reentering worker were correlated with the foliar residues, and when the residues on the leaves were reduced to less than 27 ng/cm2, it was suggested that contact with leaves do not cause dermal exposure.
