| Abstrakt: |
The objective of this work was to study the dermal exposure of workers to residues of the deltamethrin, applied in cotton. After 3 minutes of application four people dressed a group with cotton clothes (pants, shirt and gloves), entered and stayed in the treated area by 30 minutes, simulating a sampling. The procedure was repeated after 60 and 300 minutes and 1, 3, and 7 days after the application. The clothes were cut and put in plastic bags, and stored cold at -18°C (-0.4°F) until analyses was performed. The analytical method consisted on the extraction of deltamethrin residues with ethyl acetate and the quantitative determination was done by gas chromatography. Exposure was extrapolated to a workday of 8 hours. To evaluate safety's conditions at work was estimated the Working Condition Unsafe (margin of safety - MOS <1), Poisonous Dose (%PD/day), Dermal Dose Tolerable and the estimate of Safe Work Duration (SWD). The corresponding group for the forearms/arms/hands concentrated 61.27% of present residues in the clothes. The residues found on the clothes, chest, legs, thighs and back, were 13.40, 9.33, 9.32, and 6.65%, respectively. Results of deltamethrin amounts trapped on cotton clothes showed that 24h as a re-entry interval for Decis 25 EC is overestimated in Brazil. [ABSTRACT FROM AUTHOR] |
