Miniaturized QuEChERS based methodology for multiresidue determination of pesticides in odonate nymphs as ecosystem biomonitors

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Título

Miniaturized QuEChERS based methodology for multiresidue determination of pesticides in odonate nymphs as ecosystem biomonitors

Tema

PESTICIDAS
RESIDUO DE PESTICIDAS
ANALISIS DE PESTICIDAS
METODO QUECHERS
BIBLIOGRAFIA NACIONAL QUIMICA
2018

Abstract

The impacts of the modern, agrochemicals based agriculture that threatens the overall systems sustainability, need to be monitored and evaluated. Seeking for agroecosystems monitors, the present article focus in the occurrence and abundance of aquatic macroinvertebrates, that have been frequently used as bioindicators of water quality due to their relationship with land use. Some of these organisms are on the top of the food chain, where bioaccumulation and biomagnification processes can be observed, and they can turn into secondary pollution sources of systems and terrestrial organisms as well. Odonate nymphs, which belong to the functional group of predators, were selected for this study. A methodology to determine 73 pesticide residues in odonate nymphs by LC-MS/MS and GC-MS/MS was developed. A QuEChERS sample preparation strategy was adapted. As it is complex to obtain samples especially in disturbed ecosystems, the method was minimized to a sample size of 200 mg of fresh nymphs. The method was validated and good recoveries (71–120%) with RSDs below 20% for the majority of the studied pesticides at least at two of the assayed levels 1, 10 and 50 µg kg−1 were obtained. For 32 analytes the limit of quantitation was 1 µg kg−1 and 10 µg kg−1 for the others. The lineal range was observed between 1–100 µg kg−1 in matrix-matched and solvent calibration curves for most of the assessed pesticides. LC-MS/MS matrix effects were evaluated, 40% of the analytes presented low or no signal suppression. Only flufenoxuron presented high matrix effects. The obtained methodology is adequate for pesticide multiresidue analysis in aquatic macroinvertebrates (odonates) aiming to contribute to the ecological state evaluation of freshwater ecosystems.

Autor

Jesús, Florencia
Hladki, Ricardo
Gérez, Natalia
Besil, Natalia.
Niell, Silvina
Fernández, Grisel
Cesio, María Verónica.

Fuente

Talanta  v. 178, 2018. -- p. 410-418

Editor

Elsevier

Fecha

2018

Derechos

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PDF

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Ingles

Tipo

Artículo

Identificador

DOI: 10.1016/j.talanta.2017.09.014

Document Item Type Metadata

Original Format

PDF
Fecha de agregación
November 28, 2018
Colección
Bibliografía Nacional Química
Tipo de Elemento
Document
Etiquetas
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Citación
Jesús, Florencia, “Miniaturized QuEChERS based methodology for multiresidue determination of pesticides in odonate nymphs as ecosystem biomonitors,” RIQUIM - Repositorio Institucional de la Facultad de Química - UdelaR, accessed May 31, 2020, http://riquim.fq.edu.uy/items/show/5462.
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