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A photo-induced fluorescence method for determination of propanil herbicide residues in Senegal natural waters

Many pesticides, such as propanil, a post-emergence contact anilide herbicide, are extensively applied for protecting various crops in Senegal and other countries, resulting in the presence of pesticide residues in natural waters, with notable toxicological effects on increased with the irradiation time, towards a maximum, then, rapidly decreased, and, for some solvents, reached a plateau region (Fig. 1). The optimum irradiation times (topt = 6-15min) were shorter in organic solvents, and the PIF signals measured at topt were significantly higher in organic solutions than in water. Therefore, it was more advantageous to use organic media for improving the method rapidity and sensitivity. The excitation and emission PIF spectra presented a single peak. No significant shift of the excitation maximum was noted, whereas blue-shifts of 11-35nm of the PIF emission peak in methanol and cyclohexane relative towater occurred. Upon increasing the irradiation time, propanil did not exhibit any significant change in the shape of the PIF emission spectra, but a significant increase of PIF intensity.

Auteur(s) : O.M.A. Mbaye, M. D. Gaye Seye, J. J. Aaron, A. Coly, A. Tine, M. A. Oturan, N. Oturan
Pages : 554-555
Année de publication : 2012
Revue : Journal of Biological and Chemical Luminescence
N° de volume : 27 (6)
Type : Article
Mise en ligne par : GAYE Mame Diabou