Abstract
A simple, sensitive, and efficient method has been developed for the determination of the seven neonicotinoid insecticides commercially available (imidacloprid, thiacloprid, clothianidin, thiamethoxam, acetamiprid, nitenpyram, and dinotefuran) and the main metabolite 6-chloronicotinic acid. Micellar electrokinetic chromatography (MEKC) mode was applied, using 48.5 cm of total length capillary (50 μm i.d.) with an extended light-path capillary (150 μm). The running electrolyte consisted of 25 mM sodium tetraborate buffer (pH 9.2) containing 120 mM of sodium dodecyl sulfate and 15% of methanol (v/v). A voltage of 27 kV and a temperature of 25 °C were applied. Samples dissolved in deionized water were hydrodynamically injected at 50 mbar for 12 s, achieving the analysis in less than 12 min. Diode array detection (DAD) was performed at 220, 254, and 270 nm, depending on the analyte. Two different methodologies as sample treatments were developed; for water samples, solid-phase extraction was checked using different cartridges (C18, Oasis® HLB, Oasis® HLB Prime, and Strata-X), being the best option Oasis® HLB for preconcentration and cleanup. In the case of soil samples, a simple solid–liquid extraction was applied using a mixture of 1:3 (v/v) acetonitrile/dichloromethane. Satisfactory linearity, trueness, and precision were achieved, with detection limits in the range of 0.1–0.4 μg L−1 for river water and 1.0–2.9 μg kg−1 for soil samples. Recoveries in the range of 80–107% for all of the assayed neonicotinoids in water samples of different origin and 73–92% for soil samples were achieved.
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11 October 2021
A Correction to this paper has been published: https://doi.org/10.1007/s00216-021-03661-5
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Acknowledgments
LCR thanks the Youth Employment Operational Program co-funded by the Ministry of Science, Innovation and Universities of the Junta de Andalucía and the European Social Fund (ESF).
Funding
The authors received financial support from the Spanish Ministry of Economy and Competitiveness (project ref: AGL2015-70708-R). FJL received personal funding from the Special Research Program of the University of Granada.
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Analytes: NTP, nitenpyram; DNT, dinotefuran; CLT, clothianidin; THT, thiamethoxam; ACT, acetamiprid; IMD, imidacloprid; TCP, thiacloprid; 6-CNA, 6-chloronicotinic acid
CPE, cloud point extraction; DLLME, dispersive liquid–liquid microextraction; DSPE, dispersive solid-phase extraction; MSPD, matrix solid-phase dispersion; QuEChERS, quick, easy, cheap, effective, rugged, and safe; RTIL-LPME, ringer tablet-based ionic liquid-phase microextraction; SLE, solid–liquid extraction; VA-d-μ-SPE, vortex-assisted dispersive microsolid-phase extraction; VSLLME-SFO, vortex-assisted surfactant-enhanced emulsification liquid–liquid microextraction with solidification of floating organic droplet
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Carbonell-Rozas, L., Lara, F.J., del Olmo Iruela, M. et al. Micellar electrokinetic chromatography as efficient alternative for the multiresidue determination of seven neonicotinoids and 6-chloronicotinic acid in environmental samples. Anal Bioanal Chem 412, 6231–6240 (2020). https://doi.org/10.1007/s00216-019-02233-y
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DOI: https://doi.org/10.1007/s00216-019-02233-y