Etude spectroscopique de purines et pyrimidines : fluorescence, phosphorescence et spectrometrie d'absorption derivee : applications analytiques

SIGLECNRS T Bordereau / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

Degradation and mineralization of the phenylurea herbicide fluometuron in aqueous media by electro-Fenton process.

International audienc

Development of a photo-induced fluorescence method for determination of anilide pesticides used in Senegal

International audienc

A spectrofluorimetric method for the determination of pindolol in natural waters using various organic and cyclodextrin media

International audienc

Development of a photo-induced fluorescence method for determination of anilide pesticides used in Senegal

International audienc

Development of a photo-induced fluorescence method for determination of anilide pesticides used in Senegal

International audienc

Photodegradation study of insecticide fenvalerate by NMR and GC-MS and the structural elucidation of its metabolites

International audienc

A NEW DIRECT LASER PHOTO-INDUCED FLUORESCENCE METHOD COUPLED ON-LINE WITH LIQUID CHROMATOGRAPHIC SEPARATION FOR THE SIMULTANEOUS DETERMINATION OF ANILIDES PESTICIDES

International audienc

Separation and mechanisms of identification of fluorescence photoproducts of fenuron and diflubenzuron by GC-MS.

International audienc

Solvolysis kinetic study and direct spectrofluorimetric analysis of the fungicide benomyl in natural waters

International audienceA direct spectrofluorimetric method for the quantitative analysis of benomyl in natural waters is described. Benomyl is an instable, fluorescent fungicide that mainly decomposes into carbendazim and n-butyl-isocyanate in organic and aqueous solutions. The kinetics of benomyl solvolysis reactions were investigated in organic solvents (methanol and acetonitrile) and in aqueous solvent systems, including β–cyclodextrin (β-CD), sodium dodecyl sulfate (SDS), dodecyltrimethylammonium chloride (DTAC), cetyltrimethylammonium chloride (CTAC), cetyltrimethylammonium hydroxide (CTAOH), Brij-700, Triton X-100 and water, at different pH and/or NaOH concentrations. The benomyl fluorescence signal was found to be quasi-completely stable in 10-2 M NaOH aqueous solution, various alkaline (10-2 M NaOH) organized media, β-CD neutral solution and Triton X-100 aqueous solutions of different pH. Based on these results, a direct spectrofluorimetric analytical method was developed for the determination of benomyl in 10-2 M NaOH aqueous solution and Triton X-100 solutions (pH7 and 10-2 M NaOH), with wide linear dynamic range (LDR) values of two to three orders of magnitude, very low limit of detection (LOD) and limit of quantification (LOQ) values of, respectively, 0.002-0.5 ng/mL and 0.007-2.0 ng/mL, and small relative standard deviation (RSD) values of 0.2-1.7 %, according to the medium. This direct spectrofluorimetric method was applied to the evaluation of benomyl residues in natural waters, with satisfactory recovery values (87-94%).</p