| Popis: |
Detmolin (dichlorvos) residues in the air after fogging were studied in Brandenburg, Germany during 1999-2001. The level of active substance contained in the air of the store, at the store's windows and ventilation points, and at 5, 10, 20 and 50 m downwind of the building at a height of 1.6 m was measured using adsorption tubes. With an application of 6 litre Detmolin F/1000 m3, the maximum concentration of the active substance found in the six trials was 95 mg/m3 in the stores. The maximum concentration at windows and doors was measured when these were opened 4 or 6 hours after treatment. Depending on wind speed and temperature, concentrations fluctuated between 100 and 550 µg/m3. Pesticide concentrations in nontarget areas clearly decreased both with increasing time after treatment and with increasing distance from the treated store. Deposition was measured both in model standard waters (steel tubs) and on filter paper. Maximum concentrations of the active substance in water were found in four trials, in the water samples drawn 5 m from the store 24 h after application. These concentrations ranged from 5 to 50 µg/litre. |
