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Extraction and preconcentration of organophosphorus pesticides in water by using a polymethacrylate-based sorbent modified with magnetic nanoparticles

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Abstract

A polymethacrylate-based sorbent modified with magnetic nanoparticles (MNPs) has been synthesized and used as sorbent for solid-phase extraction (SPE) and magnetic solid-phase extraction (MSPE) of three organophosphorus pesticides (phosmet, pirimiphos-methyl, and chlorpyrifos) in water samples followed by high-performance liquid chromatography–diode array detection. The sorbent was prepared from a glycidyl methacrylate-based polymer, modified with a silanizing agent, followed by immobilization of MNPs on the surface of the material. The sorbent was characterized by scanning electron microscopy and Fourier transform infrared spectroscopy. Comparative studies of this support were done both in conventional SPE cartridge and MSPE approach. Several extraction parameters (loading pH, elution solvent, eluting volume, and loading flow rate) were investigated in detail. Under optimal conditions, the proposed sorbent gave an excellent enrichment efficiency of analytes and detection limits between 0.01 and 0.25 μg L−1. The recoveries of organophosphorus pesticides in spiked water samples were in the range of 71–98%, and the developed sorbent showed a high reusability (up to 50 uses without losses in recovery). The proposed method was satisfactorily applied to the analysis of these pesticides in water samples from different sources.

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Acknowledgements

This work was supported by projects CTQ2014-52765-R (MINECO of Spain and FEDER) and PROMETEO/2016/145 (Consellería de Educación, Investigación, Cultura y Deporte of Generalitat Valenciana, Spain).

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Correspondence to Susana Meseguer-Lloret or José M. Herrero-Martínez.

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Meseguer-Lloret, S., Torres-Cartas, S., Catalá-Icardo, M. et al. Extraction and preconcentration of organophosphorus pesticides in water by using a polymethacrylate-based sorbent modified with magnetic nanoparticles. Anal Bioanal Chem 409, 3561–3571 (2017). https://doi.org/10.1007/s00216-017-0294-x

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  • DOI: https://doi.org/10.1007/s00216-017-0294-x

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