Photochemically-induced fluorescence determination

of Etofenprox in natural waters by using Micellar media

 

R. Adamou1*, A. Coly2, A. Abdoulaye1, M. Soumaila1, I. Moussa1, K. Ikhiri1, A. Tine2

1Département de Chimie, Faculté des Sciences, Université Abdou Moumouni, BP 10662, Niamey-Niger.

2Faculté des Sciences et Techniques (FST), Université Cheikh Anta Diop (UCAD), BP 5005, Dakar-FANN, Sénégal.

* Corresponding author: E-mail: arabani@refer.ne

Received: 05 November 2009; revised version accepted: 22 December 2010

 

Abstract

     An analytical method based on the use of UV-irradiation to produce fluorescent derivatives from non-fluorescent pyrethroid insecticide (Etofenprox) is described. The impact of CetylTrimethylAmmonium Chloride (CTAC) micellar media on the Etofenprox photochemically-induced fluorescence (PIF) is reported. Parameters influencing the sensitivity of the PIF method have been optimized. The alkaline medium (NaOH 6x10-2 M) + CTAC micellar molecules (3.84 mg/ml) in acetonitrile is found to be very suitable for Etofenprox 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 waters.

 

Keywords: Pyrethroid insecticide; Etofenprox; PIF; Micellar media; Natural waters; Analytical method.


 

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