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Solvolyis kinetic study and direct spectrofluorometric analysis of fungicide benomyl in natural water

A direct spectrofluorimetric method for the quantitative analysis of benomyl in natural waters is described here. Benomyl is an unstable, 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, includ-ing ?-cyclodextrin (?-CD), sodium dodecyl sulphate (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 fluores-cence signal was found to be quasi-completely stable in 10–2 M NaOH aqueous solution, various alkaline (10–2 M NaOH) organised media, ?-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 determi-nation 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 0.002–0.5 ng/ml and 0.007–2.0 ng/ml, re-spectively, 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 wa-ters, with satisfactory recovery values recorded (87–94%).

Auteur(s) : D.D. Thiaré, A. Konté, D. Sarr , C. Diop , M.D. Gaye-Seye , A. Coly , F. Delattre , A. Tine, J-J. Aaron
Pages : 237-248
Année de publication : 2014
Revue : Macedonian Journal of Chemistry and Chemical Engineering
N° de volume : 33(2)
Type : Article
Mise en ligne par : THIARE Diène Diégane