Analytical Sciences

Analysis of Oxadiazon Herbicide in Natural Water Samples by a Micellar-enhanced Photo-induced Fluorescence

Jean Pierre BAKHOUM,* Olivier M. A. MBAYE,* Pape A. DIAW,** Lamine CISSE,* Moussa MBAYE,* Mame D. GAYE-SEYE,* Atanasse COLY,* Bernard LE JEUNE,*** and Philippe GIAMARCHI***

*Lab. Photochimie et d’Analyse, Univ. C. A. Diop, Dakar, Sénégal
**Lab. Matériaux, Electrochimie et Photochimie Analytique, Univ. A. Diop, Bambey, Sénégal
***OPTIMAG Lab., Brest Univ., 6 Av. Victor Le Gorgeu, 29285 Brest Cedex, France

A micellar-enhanced photo-induced fluorescence (ME-PIF) method was developed to analyze, for the first time, oxadiazole herbicide (namely oxadiazon) in natural water samples. Photo-conversion under UV irradiation of the herbicide into strongly fluorescent photoproducts was performed in aqueous solution and in the presence of two surfactants, cetyltrimethylammonium chloride (CTAC) or Tween 20, at micellar concentrations. The ME-PIF parameters were optimized. The ME-PIF method gave very good results with satisfactory analytical performance for the determination of a selected pesticide with concentration linear dynamic ranges of over one to two orders of magnitude. It yielded good reproducibility (RSD values of between 3.6 and 9.6%) in tap, river and sea water spiked samples, and the limits of detection were in the ng mL⁻¹ range.

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