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

Mendy, Alphonse; Thiaré, Diène Diégane; Sambou, Souleymane; Khonté, Abdourahmane; Coly, Atanasse; Gaye-Seye, Mame Diabou; Delattre, François; Tine, Alphonse

doi:10.1016/j.talanta.2016.01.036

Cited by 10 publications

(2 citation statements)

References 28 publications

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“…1,6 Thus, pesticide degradation can also take place by photochemistry, [7][8][9] as well as by electrodecomposition and thermal decomposition. [10][11][12] It is worthwhile to point out that, in some cases, the pesticide degradation products are more toxic than the native substances 13 and that pesticide molecules can be degraded relatively rapidly in plants and soils according to the types of treatments and agronomic practices. 14,15 Synthetic pyrethroids are like the natural pyrethrins and were widely used in agriculture and as household insecticides.…”

Section: Introductionmentioning

confidence: 99%

Photodegradation study of the fenvalerate insecticide by 1H NMR, 13C NMR, and GC-MS and structural elucidation of its transformation products

Thiaré

Diaw

Mbaye

et al. 2022

Maced. J. Chem. Chem. Eng.

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The photolysis of fenvalerate, a pyrethroid insecticide, was studied in acetonitrile by 1H nuclear magnetic resonance (NMR) and 13C NMR to identify the site of bond cleavage and gas chromatography-mass spectrometry (GC-MS) to establish the chemical structure of fenvalerate photoproducts. Ultraviolet (UV) irradiation of fenvalerate solutions was performed for 18 h with a solar light simulator, and the photolysis reaction obeyed first-order kinetics. Photolysis half-life time (t1/2) values ranged between 15.25 and 21.63 h (mean photodegradation percentage = 51.7 %) for 1H NMR and between 4.55 and 8.06 h (mean photodegradation percentage > 80 %) for 13C NMR. We observed five sites of bond cleavage, namely carbonyl-tertiary carbon, tertiary carbon-tertiary carbon, carbonyl-oxygen, carboxyl-tertiary carbon, and aromatic carbon-tertiary carbon, yielding photoproducts formation. GC-MS was associated with 1H NMR and 13C NMR to obtain a complete photodegradation mechanism. Before UV irradiation, two chromatogram peaks were obtained, due to the two fenvalerate isomers. Under irradiation, both peaks decreased, and new peaks appeared, corresponding to photoproduct formation. After a 12- to 13-h irradiation, 99.39 % of fenvalerate was degraded with a mean rate constant of 0.305 h–1. The chemical structure of the formed photoproducts was identified, either by using the National Institute of Standards and Technology (NIST) mass spectral database or by interpreting the mass spectra. Finally, a detailed mechanism was proposed for fenvalerate photodegradation.

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Section: Introductionmentioning

confidence: 99%

Photodegradation study of the fenvalerate insecticide by 1H NMR, 13C NMR, and GC-MS and structural elucidation of its transformation products

Thiaré

Diaw

Mbaye

et al. 2022

Maced. J. Chem. Chem. Eng.

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“…no. 69327-76-0), is a white crystalline, odorless powdered insecticide. , As an insecticide, buprofezin has a potent larvicide activity against coleopteran, part from homoptera, and acarina. In addition, it is widely applied to potatoes, citrus plants, cotton, and so on. − …”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Models for Determination of Solid–Liquid Equilibrium of the Buprofezin in Pure and Binary Organic Solvents

Xü

Heng

et al. 2019

J. Chem. Eng. Data

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Buprofezin is a kind of insecticide and an important chemical intermediate product. Data on solid−liquid equilibrium of buprofezin in different solvents is essential for the area of industrial applications. In this work, the solubility of buprofezin in methanol, ethanol, isopropanol, n-butanol, acetonitrile, n-hexane, ethyl acetate, N,N-dimethylformamide, and two binary solvent mixtures (methanol + ethyl acetate and acetonitrile + ethyl acetate) was measured at the temperature range of 278.15−328.15 K at atmospheric pressure by the gravimetric method. The experimental values showed that elevated temperatures increased the solubility of buprofezin in all selected solvents. The modified Apelblat model, the Buchowski− Ksiazaczak λh model, combined nearly ideal binary solvent/Redlich−Kister (CNIBS/R-K) model, Jouyban−Acree model, and an ideal model were used to describe and predict the diversification trend of solubility.

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Inclusion Complex of O-phthalaldehyde-Buprofezin with Dimethyl-β-Cyclodextrin Using Thermochemically-Induced Fluorescence Derivatization (TIFD) Method and its Analytical Application in Waters

et al. 2019

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

Cited by 10 publications

References 28 publications

Photodegradation study of the fenvalerate insecticide by 1H NMR, 13C NMR, and GC-MS and structural elucidation of its transformation products

Photodegradation study of the fenvalerate insecticide by 1H NMR, 13C NMR, and GC-MS and structural elucidation of its transformation products

Thermodynamic Models for Determination of Solid–Liquid Equilibrium of the Buprofezin in Pure and Binary Organic Solvents

Inclusion Complex of O-phthalaldehyde-Buprofezin with Dimethyl-β-Cyclodextrin Using Thermochemically-Induced Fluorescence Derivatization (TIFD) Method and its Analytical Application in Waters

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