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Int J Environ Res Public Health. 2019 Aug 15;16(16). pii: E2922. doi: 10.3390/ijerph16162922.

Dissipation Behavior of Three Pesticides in Prickly Pear (Opuntia ficus-indica (L.) Mill.) Pads in Morelos, Mexico.

Author information

1
Posgrado en Ciencias Agropecuarias y Desarrollo Rural, Facultad de Ciencias Agropecuarias, Universidad Autónoma del Estado de Morelos (UAEM), Av. Universidad 1001, Col. Chamilpa, Cuernavaca, Morelos 62209, México.
2
Centro de Investigaciones Químicas, Instituto de Ciencias Básicas y Aplicadas (UAEM), Av. Universidad 1001, Col. Chamilpa, Cuernavaca 62209, Mexico.
3
Universidad de Sonora, Departamento de Agricultura y Ganadería, Carretera Bahía de Kino km 21. Hermosillo, Sonora 83000, México.
4
Posgrado en Ciencias Agropecuarias y Desarrollo Rural, Facultad de Ciencias Agropecuarias, Universidad Autónoma del Estado de Morelos (UAEM), Av. Universidad 1001, Col. Chamilpa, Cuernavaca, Morelos 62209, México. victor.lopez@uaem.mx.

Abstract

The dissipation of three field-applied pesticides (chlorothalonil, chlorpyrifos, and malathion), on cultivated prickly pear (Opuntia ficus-indica (L.) Mill.) pads was studied. The extraction of pesticides was carried out using the European quick, easy, cheap, effective, rugged, and safe (QuEChERS) extraction technique and detection was carried out using tandem liquid chromatography with mass spectrometry. At harvest, 15 days after application, pesticide dissipation was below the level of detectability. Dissipation curves for prickly pear pads fit to a first-order kinetic equation. Two initial concentration levels were used for each pesticide. The approximate dissipation time for all pesticides studied was similar (10 days) and the half-life time was around six days. Final concentrations for the three pesticides were below the reference maximum residue level (MRL) (0.01 mg/kg), which suggests that these products can be applied safely in the commercial production of prickly pear pads at the established concentrations.

KEYWORDS:

QuEChERS; dissipation; food-safety; pesticide residues

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