Evaluación de la degradación de residuos de insecticidas organofosforados en granos de maíz (Zea mays L.) almacenados

The aims of this work were to monitor the dissipation dynamics of the organophosphate insecticides applied to corn grains stored in supervised experiments, establish the dissipation dynamics and determine the minimum period post application necessary to comply with the established commercial standar...

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Detalles Bibliográficos
Autores: Strada, Julieta, Bruno, Cecilia Ines, Nassetta, Mirtha María, Balzarini, Monica Graciela, Conles, Martha Yolanda, Rojas, D., Ricca, A. P., Cristos, Diego Sebastián, Martínez, María José
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2021
País:Argentina
Institución:Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio:CONICET Digital (CONICET)
Idioma:español
OAI Identifier:oai:ri.conicet.gov.ar:11336/184917
Acceso en línea:http://hdl.handle.net/11336/184917
Access Level:acceso abierto
Palabra clave:CHLORPYRIFOS-METHYL
DEGRADATION KINETICS
DICHLORVOS
GRAINS
PIRIMIPHOS-METHYL
POSTHARVEST
RESIDUES
https://purl.org/becyt/ford/4.5
https://purl.org/becyt/ford/4
Descripción
Sumario:The aims of this work were to monitor the dissipation dynamics of the organophosphate insecticides applied to corn grains stored in supervised experiments, establish the dissipation dynamics and determine the minimum period post application necessary to comply with the established commercial standards. The insecticides dichlorvos (DDVP), chlorpyrifos-methyl+deltamethrin (CPM) and pirimiphos-methyl (PMM) were applied to maize grains, which were then stored for 120 days. The samples were processed and extracted using the QuEChERS technique and the pesticide residues were identified and quantified by gas chromatography-mass spectrometry. Deltamethrin residues were not analized. After 90 days of storage, more than 80 % of the initial residue had been degraded, and after 120 days the residues were below the detection limit (LoD). DDVP, CPM and PMM residues followed a first order degradation dynamics [Ct =C0 ×e(-kt)], with k values ​of 0.384, 0.025 and 0.020 and estimated half-lives of 1.8, 27.7 and 34.7 days, respectively. These results show that at recommended dosages, the insecticides CPM and PMM are safe for use on stored maize grains; DDVP results provide additional evidence further reasserting its prohibition, which dates back to 2018.

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