ABSTRACT
Pesticide residues, especially in fruit and vegetsble production, raise worries about the consumers' health and the workers who need to return to the treated crops with these pesticides. The objective of this work was to study the occurence and behavior of dislodgeable residues of deltamethrin pyrethroid inseticide, applied in different types of formulations on leaves of a staked cucumber crop as a starting point for occupation exposure studies. The treatments were: (a)control; (b)three applications of 30 mL Decis 25 EC.100 L-1 water; (d) three applications of 3.75 mL Decis 200 CS.100 L-1 water. All decis treatments consisted of 0.75 g a.i deltamethrin 100L-1 water. Samples were taken (-1); zero; 1; 3; 5; 7 and 14 days after the last application. The analytical method consisted of the extraction of deltamethrin residues with Sur-ten solution, clean-up of the extracts by gel permeation chromatography (GPC), with elution made with a mixture of ethyl acetate/cyclohexane. The quantitative determination was done by gas chromatograph, using electron capture detector. The dislodgeable residues of deltamethrin were righerin CS as compared to the both EC's (4-20 times), with hal-life values of 2.8; 3.8 and 32.2 days, respectively for the formulation ma pose higher danger to workers, it is emphazide the need of the proper use of individual protection equipament when applying thse chemicals or returning to treated areas to perform other crop tasks...