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Development of a new automatic on-site detector of pesticides in natural waters by photo induced fluorescence, application to three phenylurea and benzoylurea herbicide

Prototypes of on-site automatic photo inducedfluorescence detectors of pesticide in natural waters are set upand applied for the determination of the benzoyl- and phenylurea pesticides, namelyfluometuron, monolinuronand diflubenzuron. As these pesticides presentnonativefluorescence the set up system use the photo conversionunder UV irradiation of these pesticides into highlyfluorescent photoproducts.Afirst system, called AUTOPIF, (evolution the commercial AQUAPOD system) is develop using a detection via adiode array spectrometer. To improve the sensitivity of the method, a second system, called AUTOPIF+, is devel-oped with a more resolute spectrometer and an intensified CCD camera detection.Analytical applications were carried out in aqueous solution and detected on line with the AUTOPIF and AUTOPIF+system. The calibration curves are linear over one order of magnitude, and the limits of detection are in the?gmL?1range. The analytical performances of these methods for the determination of the three pesticides aresatisfactory in comparison to other classical PIF methods published for the determination of phenylurea pesticidesin aqueous solutions. Our results show that the AUTOPIF and AUTOPIF+ methods are versatile, sensible and can beeasily applied as an alert system to detect pollutant residues in naturals waters over a threshold value

Auteur(s) : Jean Pierre Bakhoum, Olivier Maurice Ali Mbaye, Pape Abdoulaye Diaw, Moussa Mbaye, Lamine Cisse, Mame Diabou Gaye-Seye, Jean-Jacques Aaron, Atanasse C
Pages : 285-293
Année de publication : 2019
Revue : Specctrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
N° de volume : 214 (5)
Type : Article
Mise en ligne par : CISSE Lamine