Residues of organophosphorus pesticides on soils of José María Vargas municipality, Táchira-Venezuela.
DOI:
https://doi.org/10.15649/2346030X.411Keywords:
Soil, organophosphorus pesticides, gas chromatography.Abstract
Undoubtedly the importance and need phytosanitary protection products to maintain levels of food production that demands the world's population; but, the constant and inappropriate use of these products could incorporate pesticide residues in soil. This paper addresses the multiple determinations of organophosphorus pesticide residues in soils Township José María Vargas. The developed method was applied for the determination of seven pesticides: Methamidophos, Diazinon, Dimethoate, Chlorpyrifos, Malathion, Methyl parathion, Tetrachlorvinphos in soil samples were identified based on their retention times (tr) by comparison with patterns. Mechanical extraction and ultrasonic tested in the optimization of the method, resulting in the extraction with mechanical agitation a reliable method for the determination of pesticides. You can say that 6 of the 7 studied pesticides were detected in 8 locations. Of all plots (75) studied the 65.33% (49 plots) had residues SPOs. Chlorpyrifos is present in all the villages studied, in terms of this Malathion was not detected. This would suggest that contamination with these pesticides may be due to large amounts applied and high frequency applications. Note that in Venezuela there is no legislation governing the concentration limits of pesticides in the soil so it cannot be said that there is a contamination as such, which is why studies like this can be taken as reference for the development of rules governing the management of soils.
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