Environmental Water Samples Analysis of Pesticides by Means of Chemometrics Combined with Fluorimetric Multioptosensing |
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Authors: | Ana Domínguez-Vidal Pilar Ortega-Barrales Antonio Molina-Díaz |
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Institution: | (1) Department of Physical and Analytical Chemistry, Faculty of Experimental Sciences, University of Jaén, Campus Las Lagunillas, E-23071 Jaén, Spain |
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Abstract: | A single flow-through optosensor spectrofluorimetric system is proposed for the resolution of mixtures of three pesticides,
α-naphthol, o-phenylphenol and thiabendazole, at μg l−1 levels using a partial least-squares (PLS) calibration approach. The sensor was developed in conjunction with a monochannel
flow-injection analysis system with fluorimetric detection using C18 silicagel as an active sorbent substrate in the flow cell. By using 20% methanol-water (v:v) solution as carrier solution,
the multisensor responds linearly in the measuring range without requiring additional reagents or derivatization. First derivative
emission spectra of the corresponding analytes recorded during the process of retention-elution were used to provide multivariate
data. The different kinetic on the retention process of the analytes on the sensing zone allows the selection of a time matrix
for each analyte providing best results in the PLS approach. Accurate prediction results were obtained for the three analytes
with RMSEP values of 1.86%, 3.34% and 0.50% were obtained for α-naphtol, o-phenylphenol and thiabendazole respectively. In
the analysis of environmental waters samples, a mean recovery of 103% was obtained. |
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Keywords: | Pesticide FIA Multisensing PLS α -naphthol O-phenylphenol Thiabendazole |
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