Photochemical-spectrofluorimetric method for the determination of benzoylurea insecticides: applications in river water samples and in technical formulations

Gil-García, M. D.; Martínez-Galera, M.; López-López, T; Martı́nez-Vidal, José Luis; Mahedero, M. C.; Salinas, F.

doi:10.1016/s0039-9140(00)00528-2

Cited by 40 publications

(10 citation statements)

References 21 publications

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“…The experiments were performed in three replicates at room temperature, and the levels of the variables were selected to cover low, medium and high levels. The pH was not controlled in our experiments because the pH value has little effect on the extraction efficiency of benzoylureas and pyrethroids, according to previous reports [28,29]. ANOVA was used to estimate the main effects of the various parameters.…”

Section: Experimental Designsmentioning

confidence: 99%

Ultrasound‐assisted, hybrid ionic liquid, dispersive liquid–liquid microextraction for the determination of insecticides in fruit juices based on partition coefficients

Zeng

Yang

et al. 2017

J of Separation Science

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An ultrasound-assisted, hybrid ionic liquid, dispersive liquid-liquid microextraction method coupled to high-performance liquid chromatography with a variable-wavelength detector was developed to detect ten insecticides, including diflubenzuron, triflumuron, hexaflumuron, flufenoxuron, lufenuron, diafenthiuron, transfluthrin, fenpropathrin, γ-cyhalothrin and deltamethrin, in fruit juices. In this method, an appropriate extraction solvent was chosen based on the partition coefficient of the target compounds. A mixture of 1-octyl-2,3-dimethylimidazolium bis(trifluoromethylsulfonyl)imide and 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide was used as the extractant. The extraction efficiency was screened using Plackett-Burman design and optimized using central composite design. Under the optimal conditions, good linearity was obtained for all the analytes in the pure water model and the fruit juice samples. In pure water, the recoveries of the ten insecticides ranged from 85.7 to 108.9%, with relative standard deviations for one day ranging from 1.24 to 2.64%. The limits of detection were in the range of 0.19-0.69 μg/L, and the enrichment factors were in the range of 123-160. The logarithm of the n-octanol/water partition coefficient in this experiment is a useful reference to select a suitable extraction solvent, and the proposed technique was applied for the analysis of ten insecticides in fruit juice with satisfactory results.

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Section: Experimental Designsmentioning

confidence: 99%

Ultrasound‐assisted, hybrid ionic liquid, dispersive liquid–liquid microextraction for the determination of insecticides in fruit juices based on partition coefficients

Zeng

Yang

et al. 2017

J of Separation Science

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“…With the aim of obtaining information useful in LC with PIF and fluorescence detection, batch studies were carried out in previous work [27]. Thus, we established the excitation and emission spectra for these benzoylureas in different binary aqueous mixtures.…”

Section: Lc-separation and Fluorescence Detection After Photoderivatimentioning

confidence: 99%

Coupled‐column liquid chromatography method with photochemically induced derivatization for the direct determination of benzoylureas in vegetables

García

Martínez

Galera

et al. 2004

J of Separation Science

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The coupled-column (LC-LC) system, consisting of a first column packed with internal surface reversed phase (ISRP) (50x4.6 mm ID) and a Chrompack C18 (100x4.6 mm ID) as second column, allowed the simultaneous determination of five benzoylurea insecticides in dichloromethane (CH 2 Cl 2 ) extracts of vegetable samples without any clean-up step. This system was combined with a photochemically induced fluorescence (PIF) post-column derivatization in order to provide strongly fluorescent photoproducts from the non-fluorescent benzoylureas. Limits of detection ranged from 0.21 to 0.98 g L -1 of pesticide (equivalent to 0.14-0.65 g kg -1 in vegetable samples) and limits of determination ranged from 4.0 to 10.0 g L -1 (equivalent to 2.7-6.7 g kg -1 ). Linearity of the method was established between 2 and 1800 g L -1 , depending upon the compound.Validation of the total method was performed by randomly analyzing recoveries of four vegetable samples (aubergine, cucumber, green bean, and tomato) spiked at two levels of concentration (10.0 and 33.3 g kg -1 ). The combination of the LC-LC system with PIF detection provides a sensitive, selective, and rapid method for the determination of pesticides in vegetable samples at levels lower than the maximum residue levels (MRLs) established for these compounds by Spanish legislation.

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“…Many researchers have investigated the strong photochemical reactivity and fast photodegradation of benzoyl and phenylureas pesticides into a variety of photoproducts under ultraviolet (UV) light irradiation . 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 .…”

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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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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Photochemical-spectrofluorimetric method for the determination of benzoylurea insecticides: applications in river water samples and in technical formulations

Cited by 40 publications

References 21 publications

Ultrasound‐assisted, hybrid ionic liquid, dispersive liquid–liquid microextraction for the determination of insecticides in fruit juices based on partition coefficients

Ultrasound‐assisted, hybrid ionic liquid, dispersive liquid–liquid microextraction for the determination of insecticides in fruit juices based on partition coefficients

Coupled‐column liquid chromatography method with photochemically induced derivatization for the direct determination of benzoylureas in vegetables

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

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