Persistence of carbaryl and its risk assessment through consumption of treated grapes

Abstract

The average initial deposits of carbaryl were observed to be 1.4 and 3.1 mg kg−1, respectively, following four applications of the insecticide at 4.95 and 9.9 kg active ingredient per hectare. Residues of carbaryl dissipated below its limit of quantification of 50 µg kg−1 after 7 and 10 days at single and double the application dosage, respectively. The half-life values (t 1/2) of carbaryl were worked out to be 1.3 and 0.7 days, respectively, at single and double dosages. The acceptable daily intake (ADI) for carbaryl has been fixed at 8 µg kg−1 body weight per day. Keeping in view the residues of carbaryl observed one day after the last application, a child of 10 kg and an adult of 60 kg will have an intake of 77 and 154 µg carbaryl after consumption of 100 and 200 g grapes, in comparison to its ADI of 80 and 480 µg; thus, no health risk is to be expected. Therefore, a waiting period of 1 day has been suggested for the safe consumption of carbaryl-treated grapes to avoid any health hazards.