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

Herbicide metolachlor (MET) and insecticide buprofezin (BUP) were determined in naturalwater sby means of a newly-developed, simple and sensitive thermochemically-induced fluorescence derivatiza- tion (TIFD) method. The TIFD approach is based on the thermolysis transformation of naturally non- fluorescent pesticide sinto fluorescent complex O-phthalaldehyde-thermoproduct(s) in water at 70 °C for MET and at 80 °C for BUP. The TIFD method was optimized with respect to the temperature, pH, complex formation kinetic and pesticides concentrations. The limit of detection (LOD¼0.8 ngmL1 for ME Tand 3.0 ngmL1 for BUP) and quantification (LOQ¼2.6 ngmL1 for METand9.5ngmL1 for BUP)values werelow,andtherelativestandarddeviation(RSD)valuesweresmall(between1.2%and1.8%),which indicates agoodanalyticalsensitivityandagreatrepeatabilityofTIFDmethod.Recoverystudieswere performed onspikedwell,seaanddrainingwaterssamplescollectedintheNiayesareabyusingthe solid phaseextraction(SPE)procedure.Satisfactoryrecoveryresults(84–118%)wereobtainedforthe determination ofMETandBUPinthesenaturalwaters.

Auteur(s) : Alphonse Mendy, Diène Diégane Thiaré, Souleymane Sambou, Abdourahmane Khonté, Atanasse Coly, Mame Diabou Gaye-Seye, François Delattre, Alphonse Tine
Pages : 202-208
Année de publication : 2016
Revue : Talanta
N° de volume : 151
Type : Article
Mise en ligne par : COLY Atanasse