Determination of imidacloprid in water samples via photochemically
induced fluorescence and second-order multivariate calibration
Author
dc.contributor.author
Fuentes, Edwar
Author
dc.contributor.author
Cid, Camila
Author
dc.contributor.author
Báez, María E.
Admission date
dc.date.accessioned
2015-08-05T15:11:32Z
Available date
dc.date.available
2015-08-05T15:11:32Z
Publication date
dc.date.issued
2015
Cita de ítem
dc.identifier.citation
Talanta 134 (2015) 8–15
en_US
Identifier
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DOI: 10.1016/j.talanta.2014.11.017
Identifier
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https://repositorio.uchile.cl/handle/2250/132412
General note
dc.description
Artículo de publicación ISI
en_US
Abstract
dc.description.abstract
This paper presents a new method for the determination of imidacloprid in water samples; one of the most widely used neonicotinoid pesticides in the farming industry. The method is based on the measurement of excitation-emission spectra of photo-induced fluorescence (PIF-EEMs) associated with second-order multivariate calibration with a parallel factor analysis (PARAFAC) and unfolded partial least squares coupled to residual bilinearization (U-PLS/RBL). The second order advantage permitted the determination of imidacloprid in the presence of potential interferences, which also shows photoinduced fluorescence (other pesticides and/or unexpected compounds of the real samples). The photoreaction was performed in 100-mu l disposable micropipettes. As a preliminary step, solid phase extraction on C18 (SPE-C18) was applied to concentrate the analyte and diminish the limit of detection. The LOD was approximately 1 ng mL(-1), which is suitable for detecting imidacloprid in water according to the guidelines established in North America and Europe. The PIF-EEMs coupled to PARAFAC or U-PLS/RBL was successfully applied for the determination of imidacloprid in different real water samples, with an average recovery of 101 +/- 10%.