Dissipation of Pre-Harvest Pesticides on ‘Clementine’ Mandarins after Open Field Application, and Their Persistence When Stored under Conventional Postharvest Conditions

Dublin Core

Título

Dissipation of Pre-Harvest Pesticides on ‘Clementine’ Mandarins after Open Field Application, and Their Persistence When Stored under Conventional Postharvest Conditions

Tema

PESTICIDAS
MANDARINAS
CROMATOGRAFIA LIQUIDA
ESPECTROMETRIA DE MASAS
PESTICIDAS-RESIDUOS
DEGRADACION
BIBLIOGRAFIA NACIONAL QUIMICA
2018

Abstract

The dissipation of field-applied difenoconazole, imidacloprid, pyraclostrobin and spinosad on Clementine mandarins (Citrus clementina Hort. ex Tan.) under controlled conditions throughout the citrus production chain was assessed. At harvest, 42 days after application, the dissipation of these pesticides were 80, 92, and 48% for difenoconazole, imidacloprid, pyraclostrobin, respectively, and spinosad was below the level of detectability. At day 28 after application, spinosad was no longer detected. The model equations that best describe the dissipation curves of these pesticides on Clementine mandarins showed different patterns. Their half-life on Clementine, calculated by the best-fitted experimental data, were 19.2 day (1st-order model) for difenoconazole, 4.1 day (Root Factor (RF) 1st-order model) for imidacloprid, 39.8 day (2nd-order model) for pyraclostrobin and 5.8 day (1st-order model) for spinosad. These results are the first record of pyraclostrobin persistence on mandarins, showing a longer half-life in this matrix than those reported for any other fruit. The treated fruit were harvested and submitted to the usual postharvest treatments: first, a hypochlorite drenching was performed; as a second step, imazalil and wax were applied, and then the mandarins were stored at 4 °C. After 32 days, cold storage caused no significant effects on the residue levels of the four pesticides compared with those determined on freshly harvested mandarins. All residues were below their Codex and European Union (EU) maximum residue limit (MRL) for mandarin since the spray application day.

Autor

Besil, Natalia.
Luque, Eleana
Pintos, Pedro
Rivas, Fernando.

Fuente

Horticulturae  v. 4, no. 55, 2018. -- p. 1-15

Editor

MDPI

Fecha

2018

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Formato

PDF

Idioma

Inglés

Tipo

Artículo

Identificador

DOI: 10.3390/horticulturae4040055

Document Item Type Metadata

Original Format

PDF
Fecha de agregación
April 25, 2019
Colección
Bibliografía Nacional Química
Tipo de Elemento
Document
Etiquetas
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Citación
Besil, Natalia., “Dissipation of Pre-Harvest Pesticides on ‘Clementine’ Mandarins after Open Field Application, and Their Persistence When Stored under Conventional Postharvest Conditions,” RIQUIM - Repositorio Institucional de la Facultad de Química - UdelaR, accessed November 19, 2019, http://riquim.fq.edu.uy/items/show/5738.
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