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New method for the determination of metolachlor and buprofezin in natural water using orthophthalaldéhyde by thermochemically-induced fluorescence dérivatisation (TIFD)

Herbicide metolachlor (MET) and insecticide buprofezin (BUP) were determined in various types of natural waters from Senegal by means of a newly-developed, simple and sensitive thermochemically-induced fluorescence derivatization (TIFD) method. The TIFD method is based on the thermolysis transformation of naturally non-fluorescent pesticides into fluorescent complex o-phthalaldehyde-thermoproduct(s) in water at 50°C for MET and at 60°C for BUP. The TIFD method was optimized with respect to the temperature, pH, complex formation kinetic and pesticides concentrations. The limit of detection (LOD = 0.8 ng mL-1 for MET and 3.0 ng mL-1 for BUP) and quantification (LOQ = 2.6 ng mL-1 for MET and 9.5 ng mL-1 for BUP) values were low, and the relative standard deviation (RSD) values were small (between 1.2 and 1.8 %), which indicates a good analytical sensitivity and a great repeatability of TIFD. In addition, recovery studies were performed on spiked well water, sea water and draining water samples collected in the Niayes area (Senegal) by using the solid phase extraction (SPE) procedure. Satisfactory recovery results (84.2-118%) were obtained for the determination of MET and BUP in spiked natural waters.

Auteur(s) : A. Mendy, D.D,Thiaré, S. Sambou, A. Khonté, A. Coly, M.D. Gaye-Seye, F. Delattre, A. Tine
Pages : 202-208
Année de publication : 2016
Revue : Talanta
N° de volume : 151
Type : Article
Mise en ligne par : THIARE Diène Diégane