Persistence of diazinon, malathion, and parathion in coriander (Coriamdrum sativum L.), cultivated in barbacoas

摘要

Three organophosophorus pesticides were evaluated to determine their persistence in coriander (Coriamdrum sativum L.), an aromatic vegetable that is consumed both fresh and cooked in the Venezuelan diet. In the municipality of San Francisco, Zul ia, Venezuela, the indiscriminate use of malathion, parathion, and diazinon was confirmed. These were used to control several pests that attack coriander plants, thus resulting in the presence of pesticide residue in crops. These residues constitute a health hazard to consumers. The residue concentration was monitored over time, beginning the day of application (Day zero) up to Day 20. The three pesticides followed a first-order kinetic pattern, with half-lives (t(1/2)) of 2.16 for diazinon, 2.09 for malathion, and 2.04 for parathion. At Day 18, residue concentration was below the Maximum Residue Limits (MRLs). Significant differences (P < 0.05) were found between pesticide concentration and its dissipation time in coriander crops.