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Photochemically-Induced Fluorescence Dosage of Non-Fluorescent Pyrethroid (Etofenprox) in Natural Water Using a Cationic Micellar Medium.

An analytical method based on the use of UVirradiation to produce fluorescent derivatives from Etofenprox a non-fluorescent pyrethroid insecticide is described. The impact of cetyltrimethylammonium chloride (CTAC) micellar medium on the Etofenprox photochemically-induced fluorescence (PIF) is reported. Parameters influencing the sensitivity and repeatability of the PIF method have been optimized. The alkaline medium (NaOH 6×10?2 M) + CTAC surfactant molecules (3.84 mg/ml) in acetonitrile is found to be very suitable for this pyrethroid insecticide analysis in environment matrices. Linear dynamic range is established over more than two orders of magnitude. The limit of detection is lower than 5 ng/ml. The method seems to be suitable for environmental matrices quality control. Application to the analysis of spiked natural waters gave recoveries rate ranged from 94 to 104% and 107 to 115% respectively for river and pound water.

Auteur(s) : Rabani Adamou, Atanasse Coly, Alassane Abdoulaye, Maimouna Soumaila, Idrissa Moussa, Khalid Ikhiri and Alphonse Tine
Pages : 1409-1415
Année de publication : 2011
Revue : Journal of Fluorescence
N° de volume : 21
Type : Article
Mise en ligne par : COLY Atanasse