Monitoring of Organophosphorus Pesticide Residues in Vegetables of Agricultural Area in Venezuela

The purpose of this study was to determine the residues of seven pesticides organophosphorus (methamidophos, diazinon, chlorpyriphos, parathion-methyl, dimethoate, malathion and tetrachlorvinphos), in some vegetables like: potato, lettuce, tomato, onion, red pepper and green onion cultivated in Jose Maria Vargas County in Tachira State, Venezuela. The research permitted to detect that 48.0% of the samples were contaminated with some of the pesticides studied. Methamidophos was founded in the vegetables in the rank of 6.3%–65.5%. The results show that 16.7% of the samples tested have residues higher than the maximum limits permitted.