Molar absorptivities of 2,4-D, cymoxanil, fenpropidin, isoproturon and pyrimethanil in aqueous solution in the near-UV

Feigenbrugel, Valérie; Calvé, Stéphane Le; Mirabel, Philippe

doi:10.1016/j.saa.2005.04.040

Cited by 12 publications

(6 citation statements)

References 18 publications

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“…Most of the previous studies devoted to pyrimethanil photolysis used solar irradiation, a neon lamp or a xenon lamp with cutoff of irradiation under 290 nm . Thus, based on the UV–visible spectra of pyrimethanil (maximum absorption between 260 and 280 nm), negligible photodegradation was expected. In the present study, the light has not been filtered, thus explaining why phototransformation products were observed.…”

Section: Resultsmentioning

confidence: 99%

“…Photolysis experiments were carried out in a self‐made reactor equipped with a high‐pressure mercury lamp (HPL‐N 125 W/542 E27 SC; Phillips, Ivry‐sur‐Seine, France) delivering radiation at wavelengths ranging from 200 nm to 650 nm. The absorbance spectrum of pyrimethanil shows an absorption maximum between 260 and 280 nm . According to manufacturer data, the incident radiation flux was 6200 lm.…”

Section: Methodsmentioning

confidence: 99%

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Structural characterization of photoproducts of pyrimethanil

Kinani

Rifai²,

Bourcier

et al. 2013

J. Mass. Spectrom.

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International audiencePyrimethanil is an anilino-pyrimidine fungicide particularly active against gray mold (Botrytis cinerea) and pear scab (Venturia inaequalis and Venturia pirina) on grapes, strawberries, tomatoes, fruits, vegetables and ornamental plants in greenhouses and open field situation.[1-5] According to the European Food Safety Authority, pyrimethanil has no evident mutagenic, genotoxic or carcinogenic potential, but a short-term toxicity study on rats and mice has shown an increase in liver weight accompanied by changes in the histopathology of the liver and thyroid.[6] To avoid these side effects, the concentration of pyrimethanil has been limited by legislation. The European Commission set the Maximum Residue Level of pyrimethanil at 10 mg/l in citrus fruits, 5 mg/l in pome fruits, strawberries, table and wine grapes and 0.05 mg/l in tree nuts (EC/600/2010).[7] It is thus important to increase our knowledge regarding the concentration of pyrimethanil in environmental matrices, its degradability and the factors affecting it. One of these factors is the photo alteration by sunlight, which is known to play a significant role in the degradation of this compound, due to the prolonged half-life (77 days approximately) of pyrimethanil in the environment.[8] Previous studies on the degradation of pyrimethanil were carried out mainly in a waste water treatment context and focused on the photo catalytic degradation using various salts as catalysts. Agüera et al.[9] used TiO2, Vanni et al.[10] and Anfossi et al.[11] added iron III, Navarro et al.[12] added ZnO and Gomis et al.[13] used thiopyrylium. Irradiation was carried out using a mercury or xenon lamp or direct sunlight. These studies have showed that a long irradiation time (between 150 and 1400 min, depending on the conditions and catalyst) is required for total disappearance of pyrimethanil. Degradation of pyrimethanil in water using the technique of photo-Fenton was investigated by Sirtori et al. They reported that the addition of sodium chloride accelerated the reaction and characterized four chlorinated photo-Fenton by-products.[14] The aim of the present study was the identification of UV-visible photo transformation products of pyrimethanil in water. Liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS) and gas chromatography coupled with multi stage mass spectrometry (GC-MSn) were used for analysis, with the aim of covering a large range of polarities for the detection of the potential transformation products. Elucidation of the structures of photoproducts was carried out performing high-resolution measurements and collision-induced dissociation (CID) experiments. Photolysis mechanisms have also been proposed to explain the formation of photo products of pyrimethanil in water

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Structural characterization of photoproducts of pyrimethanil

Kinani

Rifai²,

Bourcier

et al. 2013

J. Mass. Spectrom.

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“…The procedure for determining the pH ZCP consisted of adding 1 g L −1 [Co–Al–Cl] LDH in 0.1 mol L −1 NaCl aqueous solution (increasing ionic strength) in different conditions of starting pH, from 2 to 12, (Regalbuto and Robles, 2004). The solutions were filtered and the final pH of the solution has been determined after 24 h of equilibration at 25 °C (Feigenbrugel et al., 2006). The pH ZCP correspond to the range in which the final pH is kept constant regardless of the initial pH.…”

Section: Methodsmentioning

confidence: 99%

“…The supernatants were recovered to measure the residual concentration of the herbicide which was determined by UV-Vis spectroscopy. The absorbance was measured at 230 nm (Feigenbrugel et al., 2006) in a Shimadzu UV-1650DC (UV-Visible Spectrophotometer). The experimental data were processed using the Statistica® software, the performance factors and the interactions between them were evaluated on the results obtained by the Pareto graph.…”

Section: Methodsmentioning

confidence: 99%

Adsorption kinetic and thermodynamic studies of the 2, 4 – dichlorophenoxyacetate (2,4-D) by the [Co–Al–Cl] layered double hydroxide

Calisto

Pacheco

Freitas

et al. 2019

Heliyon

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[Co–Al–Cl] layered double hydroxide (LDH) obtained by co-precipitation at constant pH 8 presented a single phase in a hexagonal unit cell parameters similar to the hydrotalcite (JCPDS 14-191) belonging to the rhombohedral crystal system and space group R(-3)m. The adsorption kinetics of 2,4-D onto [Co–Al–Cl] LDH was better described by the Pseudo Second-Order (best adjust R2 = 0.9998 for 60 mg L−1 2,4-D adsorption). Intra-particle diffusion model was not the sole rate-controlling factor, indicating the adsorption of 2,4-D by the [Co–Al–Cl] LDH is a complex process for the experimental conditions performed, involving both boundary layer and intra-particle diffusion. The adsorption isotherm adjusted better to the Freundlich model (R2 = 0.9845) and the ΔH° value of - 51.18 kJ mol−1 indicated the predominance of the physical adsorption. The FT-IR spectrum of LDH after adsorption presented 2,4-D bands together with those of LDH and XRD showed an increase in the interlamellar distance (d003) due to the intercalation of 2,4-D in the interlayer structure of the [Co–Al–Cl] LDH, corroborating inter and intra-particle adsorption data. Thus, [Co–Al–Cl] LDH, commonly used as electrodes in supercapacitors, can be effectively used as an adsorbent for the removal of 2,4-D from contaminated waters.

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“…Η χρήση, εποµένως, ενός φασµατοφωτόµετρου µπορούσε να αξιοποιηθεί για ποσοτικό προσδιορισµό των παραπάνω ζιζανιοκτόνων. Η αδυναµία, α isoproturon στα 245nm[235]…”

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Μελέτη Απομάκρυνσης Παρασιτοκτόνων Από Πόσιμο Νερό Με Διεργασίες Μεμβρανών

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Plakas²

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2.4.3. Αντίστροφη ώσµωση (RO) και Νανοδιήθηση (NF)………………………………… 2.4.4. Μηχανισµοί διαχωρισµού………………………………………………………………… 2.4.5. Φαινόµενα πόλωσης συγκέντρωσης και ρύπανσης µεµβρανών NF/RO………... 2.5. Αποµάκρυνση γεωργικών φαρµάκων από το νερό µε χρήση µεµβρανών NF/RO……….. 2.5.1. Ο ρόλος των µεµβρανών………………………………………………………………….. 2.5.2. Επίδραση των φυσικοχηµικών ιδιοτήτων των γεωργικών φαρµάκων…………... 2.5.3. Ο ρόλος των φυσικοχηµικών ιδιοτήτων του διαλύµατος τροφοδοσίας…………. 2.5.4. Επίδραση των λειτουργικών παραµέτρων ενός συστήµατος µεµβρανών………. xi 3.

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Molar absorptivities of 2,4-D, cymoxanil, fenpropidin, isoproturon and pyrimethanil in aqueous solution in the near-UV

Cited by 12 publications

References 18 publications

Structural characterization of photoproducts of pyrimethanil

Structural characterization of photoproducts of pyrimethanil

Adsorption kinetic and thermodynamic studies of the 2, 4 – dichlorophenoxyacetate (2,4-D) by the [Co–Al–Cl] layered double hydroxide

Μελέτη Απομάκρυνσης Παρασιτοκτόνων Από Πόσιμο Νερό Με Διεργασίες Μεμβρανών

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