Determination of phenylurea pesticides by direct laser photo-induced fluorescence

Diaw, Pape Abdoulaye; Maroto, Alicia; Mbaye, O.M.A.; Gaye-Seye, Mame Diabou; Stephan, Ludovic; Coly, Atanasse; Deschamps, Laure; Tine, Alphonse; Aaron, Jean‐Jacques; Giamarchi, Philippe

doi:10.1016/j.talanta.2013.07.014

Cited by 24 publications

(8 citation statements)

References 14 publications

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“…Our PIF studies revealed the formation of only one fluorescent photoproduct for DFB and FEN, with fluorescence spectra located, respectively, at λ ex /λ em = 331/405 nm and at 282/343 nm, when applying the classical PIF method. By contrast, the DL‐PIF method showed the formation of two fluorescent photoproducts for DFB, found at λ ex /λ em = 230/342 nm and 220/422 nm, and of three fluorescent photoproducts for FEN, occurring at λ ex /λ em = 225/308 nm, 280/342 nm and 295/420 nm . To identify the formed fluorescent photoproducts, we used standard compounds, including p‐ hydroxyaniline and phenol, considered as playing an important role in the photodegradation pathways of benzoyl‐ and phenylurea pesticides.…”

Section: Resultsmentioning

confidence: 99%

“…Several studies have reported the quantitative analysis of these pesticides in various matrices with detection limits in the ng ml −1 range . Recently, we developed photoinduced fluorescence (PIF) methods, based either on UV irradiation (classical PIF) or on laser irradiation (direct laser PIF, DL‐PIF), for the determination of diflubenzuron (DFB) and fenuron (FEN) in Senegal natural waters . The PIF and UV–VIS absorption spectral properties of DFB and FEN photoproducts, and their photolysis kinetics were also investigated.…”

Section: Introductionmentioning

confidence: 99%

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Combination of photoinduced fluorescence and GC–MS for elucidating the photodegradation mechanisms of diflubenzuron and fenuron pesticides

et al. 2019

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Diflubenzuron (DFB) and fenuron (FEN) are benzoylurea and phenylurea pesticides, widely used in Senegal, that do not exhibit any natural fluorescence, but can be determined by means of photoinduced fluorescence (PIF) methods. Photodegradation of DFB and FEN yielded a number of fluorescent and non-fluorescent photoproducts. For both pesticides, at least 10 photoproducts were detected and identified by gas chromatography-mass spectrometry (GC/MS). To identify the formed fluorescent DFB and FEN photoproducts, their fluorescence spectra were compared with those of standard compounds, including phenol and p-hydroxyaniline. KEYWORDS diflubenzuron and fenuron pesticides, fluorescent photoproducts, gas chromatography-mass spectrometry (GC-MS), photoinduced fluorescence (PIF)

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Combination of photoinduced fluorescence and GC–MS for elucidating the photodegradation mechanisms of diflubenzuron and fenuron pesticides

et al. 2019

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“…Herbicides have been extensively used for decades and have substantially improved the food production. However, the unregulated and indiscriminate applications have generated an increased presence of residues in crops, soils and surface waters, affecting ground water and disrupting water treatment plants [1]. Their persistence is an important topic of concern due to adverse effects produced in human health, in different life forms and to the ecosystems in general [2].…”

Section: Introductionmentioning

confidence: 99%

Metsulfuron-methyl determination in environmental samples by solid surface fluorescence

Alesso

Almeida

Talio

et al. 2018

Microchemical Journal

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A new environmental friendly methodology for metsulfuron-methyl quantification based on the fluorescent signal enhancement of rhodamine B dye has been developed. A cationic surfactant (cetyltrimethylammonium bromide, CTAB) and an anionic one (sodium dodecylsulfate) were employed to preconcentrate the herbicide using a coacervation phenomenon, in sodium borate buffer medium (pH 9.2). The coacervate phase was collected on a nylon membrane (0.45 μm) and the solid surface fluorescence signal was determined (λexc = 515 nm, λem = 565 nm). Experimental variables that influence on preconcentration step and fluorimetric sensitivity have been studied and optimized using response surface methodology. Under optimal working conditions, a LOD of 0.17 μg L -1 and a LOQ 0.53 μg L -1 was obtained. The zero th order regression calibration was linear from 0.53 to 5.00 μg L -1 . The method showed adequate sensitivity and selectivity, and was applied to the determination of trace amounts of metsulfuron-methyl in environmental water samples. The proposed methodology implies an alternative to traditional techniques for metsulfuron-methyl monitoring using an accessible instrument in control laboratories, Correspondence author

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“…Some authors have reported an ultra-performance liquid chromatography coupled with tandem mass spectrometry (UPLC-MS/MS) for DFB determination [24][25][26][27]. A direct Laser Photo-Induced Fluorescence (DL-PIF) method has been developed for the determination of DFB in sea and river water [28]. Floated organic drop microextraction (FDME) -high performance liquid chromatography (HPLC) has been developed for extraction and determination of benzoylurea insecticide residues from peach juice drink samples [29].…”

Section: Introductionmentioning

confidence: 99%

Development of a kinetic spectrophotometric method for insecticide diflubenzuron determination in water and baby food samples

Pecev‐Marinković

Grahovac

Pavlović

et al. 2018

Hem Ind

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A kinetic spectrophotometric method for determining residues of insecticide diflubenzuron 1(4-chlorphenyl)-3-(2,6-diflubenzoyl)urea (DFB) has been developed and validated. Kinetic method was based on the inhibitory effect of DFB on the oxidation reaction of sulfanilic acid (SA) by hydrogen peroxide in the presence of Co 2+ ions in a phosphate buffer, which was monitored at 370 nm. DFB can be measured in the concentration interval 0.102-3.40 μg mL-1 and 3.40-23.80 μg mL-1. The detection and quantification limits of the method were calculated according to the 3σ criteria and found to be 0.077 μg mL-1 and 0.254 μg Ml-1 , respectively. The relative standard deviations for five replicate determinations of 0.102, 1.70 and 3.40 μg mL-1 DFB were 2.08, 1.22 and 1.21 %, respectively, for the first concentration interval, and the recovery percentage values were from 94.12 to 97.35 %. HPLC method was used as a parallel method to verify results of the kinetic method. The kinetic method was successfully applied to determine diflubenzuron concentrations in spiked water and baby food samples after solid phase extraction of the samples. The F and t values at 95% confidence level are lower than the theoretical ones, confirming agreement of the developed and the HPLC method.

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Determination of phenylurea pesticides by direct laser photo-induced fluorescence

Cited by 24 publications

References 14 publications

Combination of photoinduced fluorescence and GC–MS for elucidating the photodegradation mechanisms of diflubenzuron and fenuron pesticides

Combination of photoinduced fluorescence and GC–MS for elucidating the photodegradation mechanisms of diflubenzuron and fenuron pesticides

Metsulfuron-methyl determination in environmental samples by solid surface fluorescence

Development of a kinetic spectrophotometric method for insecticide diflubenzuron determination in water and baby food samples

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