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Usefulness of cyclodextrin media for the determination of ?-cypermethrin by photochemically induced fluorescence: analytical applications to natural waters

The photochemically induced fluorescence (PIF) spectral properties of ?-cypermethrin in organic solvents (hexane, dichloromethane, acetonitrile, ethanol) and in cyclodextrin aqueous solutions (?-CD and 2-hydroxypropyl-?-CD, 2-HP-?-CD) were investigated. The photolysis kinetics of ?-cypermethrin were evaluated in the various media. The PIF signal was found to be significantly enhanced in the CD media relative to the organic solvents. The stoichiometry and the formation constants of the ?-cypermethrin inclusion complexes formed with the CDs were determined. The analytical performances of the PIF method were improved in the presence of HP-?-CD relative to the other media, and a CD-enhanced PIF analytical method was developed. The limits of detection and limits of quantification ranged, respectively, between 6 and 98 ng/mL and between 24 and 343 ng/mL, depending on the medium. Application to the analysis of tap water and Senegal natural water samples collected close to agricultural areas and spiked with ?-cypermethrin yielded satisfactory recoveries going from about 77% to 98%. An interference study of foreign species, including pesticides and inorganic ions likely to be present in natural waters, was also carried out.

Auteur(s) : Moussa Mbaye, Mame Diabou Gaye-Seye , Atanasse Coly, Alphonse Tine, Jean-Jacques Aaron
Pages : 1089-1098
Année de publication : 2009
Revue : Analytical and Bioanalytical Chemistry
N° de volume : 394 (4)
Type : Article
Mise en ligne par : COLY Atanasse