The Experts below are selected from a list of 39 Experts worldwide ranked by ideXlab platform
Damia Barcelo - One of the best experts on this subject based on the ideXlab platform.
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a rapid and sensitive analytical method for the determination of 14 pyrethroids in water samples
Journal of Chromatography A, 2010Co-Authors: Maria Luisa Feo, Ethel Eljarrat, Damia BarceloAbstract:Abstract A simple, efficient and environmentally friendly analytical methodology is proposed for extracting and preconcentrating pyrethroids from water samples prior to gas chromatography-negative ion chemical ionization mass spectrometry (GC-NCI-MS) analysis. Fourteen pyrethroids were selected for this work: bifenthrin, cyfluthrin, λ-cyhalothrin, cypermethrin, deltamethrin, esfenvalerate, fenvalerate, fenpropathrin, τ-fluvalinate, permethrin, phenothrin, resmethrin, tetramethrin and Tralomethrin. The method is based on ultrasound-assisted emulsification-extraction (UAEE) of a water-immiscible solvent in an aqueous medium. Chloroform was used as extraction solvent in the UAEE technique. Target analytes were quantitatively extracted achieving an enrichment factor of 200 when 20 mL aliquot of pure water spiked with pyrethroid standards was extracted. The method was also evaluated with tap water and river water samples. Method detection limits (MDLs) ranged from 0.03 to 35.8 ng L −1 with RSDs values ≤3–25% ( n = 5). The coefficients of estimation of the calibration curves obtained following the proposed methodology were ≥0.998. Recovery values were in the range of 45–106%, showing satisfactory robustness of the method for analyzing pyrethroids in water samples. The proposed methodology was applied for the analysis of river water samples. Cypermethrin was detected at concentration levels ranging from 4.94 to 30.5 ng L −1 .
Givan, William D. - One of the best experts on this subject based on the ideXlab platform.
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AN ECONOMIC EVALUATION OF SOYBEAN STINK BUG CONTROL ALTERNATIVES FOR THE SOUTHEASTERN UNITED STATES
'Morgan & Claypool Publishers LLC', 2017Co-Authors: Chyen David, Wetzstein, Michael E., Mcpherson, Robert M., Givan, William D.Abstract:Methyl parathion or Penncap M (an encapsulated methyl parathion) are used extensively throughout the United States for controlling stink bug pests in soybeans, Glycine Max (L.) Merrill. However, this insecticide is highly toxic to mammals, birds, and non-target arthropods, and thus is less environmentally sound than other insecticides. For environmental and human health considerations, investigating alternative insecticides for control is desired. For this investigation, research based on field experimental data from Florida, Georgia, and Louisiana during the 1988 and 1989 growing seasons were employed. Results indicate that alternative, currently available, and less toxic insecticides may reduce producer costs, increase yield, and improve soybean quality. These alternative insecticides include Scout (Tralomethrin), Karate (lambda-cyhalothrin), Orthene (acephate), and Baythroid (cyfluthrin). In terms of improved profits these alternative insecticides may dominate methyl parathion or encapsulated methyl parathion
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AN ECONOMIC EVALUATION OF SOYBEAN STINK BUG CONTROL ALTERNATIVES FOR THE SOUTHEASTERN UNITED STATES
2026Co-Authors: Chyen David, Wetzstein, Michael E., Mcpherson, Robert M., Givan, William D.Abstract:Methyl parathion or Penncap M (an encapsulated methyl parathion) are used extensively throughout the United States for controlling stink bug pests in soybeans, Glycine Max (L.) Merrill. However, this insecticide is highly toxic to mammals, birds, and non-target arthropods, and thus is less environmentally sound than other insecticides. For environmental and human health considerations, investigating alternative insecticides for control is desired. For this investigation, research based on field experimental data from Florida, Georgia, and Louisiana during the 1988 and 1989 growing seasons were employed. Results indicate that alternative, currently available, and less toxic insecticides may reduce producer costs, increase yield, and improve soybean quality. These alternative insecticides include Scout (Tralomethrin), Karate (lambda-cyhalothrin), Orthene (acephate), and Baythroid (cyfluthrin). In terms of improved profits these alternative insecticides may dominate methyl parathion or encapsulated methyl parathion.Crop Production/Industries,
Mushtaq Ahmad - One of the best experts on this subject based on the ideXlab platform.
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potentiation between pyrethroid and organophosphate insecticides in resistant field populations of cotton bollworm helicoverpa armigera lepidoptera noctuidae in pakistan
Pesticide Biochemistry and Physiology, 2008Co-Authors: Mushtaq AhmadAbstract:The combined action of pyrethroids plus organophosphates was assessed on putatively resistant field populations of Helicoverpa armigera from Pakistan by using a leaf-dip bioassay. Ethion showed a good potentiation with bifenthrin, lambdacyhalothrin, cyfluthrin, betacyfluthrin, fenpropathrin, esfenvalerate, fluvalenate and Tralomethrin. Profenofos was potentiating with bifenthrin but additive with lambdacyhalothrin. Methyl parathion also exhibited potentiation with bifenthrin. Contrarily, quinalphos produced an antagonism with bifenthrin. Chlorpyrifos potentiated lambdacyhalothrin in one population but had an additive effect in the other. A strong potentiation of pyrethroids by ethion in some populations indicates that esteratic detoxification is a key mechanism involved in imparting resistance to pyrethroids in Pakistani H. armigera.
Maria Luisa Feo - One of the best experts on this subject based on the ideXlab platform.
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a rapid and sensitive analytical method for the determination of 14 pyrethroids in water samples
Journal of Chromatography A, 2010Co-Authors: Maria Luisa Feo, Ethel Eljarrat, Damia BarceloAbstract:Abstract A simple, efficient and environmentally friendly analytical methodology is proposed for extracting and preconcentrating pyrethroids from water samples prior to gas chromatography-negative ion chemical ionization mass spectrometry (GC-NCI-MS) analysis. Fourteen pyrethroids were selected for this work: bifenthrin, cyfluthrin, λ-cyhalothrin, cypermethrin, deltamethrin, esfenvalerate, fenvalerate, fenpropathrin, τ-fluvalinate, permethrin, phenothrin, resmethrin, tetramethrin and Tralomethrin. The method is based on ultrasound-assisted emulsification-extraction (UAEE) of a water-immiscible solvent in an aqueous medium. Chloroform was used as extraction solvent in the UAEE technique. Target analytes were quantitatively extracted achieving an enrichment factor of 200 when 20 mL aliquot of pure water spiked with pyrethroid standards was extracted. The method was also evaluated with tap water and river water samples. Method detection limits (MDLs) ranged from 0.03 to 35.8 ng L −1 with RSDs values ≤3–25% ( n = 5). The coefficients of estimation of the calibration curves obtained following the proposed methodology were ≥0.998. Recovery values were in the range of 45–106%, showing satisfactory robustness of the method for analyzing pyrethroids in water samples. The proposed methodology was applied for the analysis of river water samples. Cypermethrin was detected at concentration levels ranging from 4.94 to 30.5 ng L −1 .
Alfonso Di Muccio - One of the best experts on this subject based on the ideXlab platform.
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determination of pyrethroid pesticide residues in fatty materials by solid matrix dispersion partition followed by mini column size exclusion chromatography
Journal of Chromatography A, 1999Co-Authors: Alfonso Di Muccio, Danilo Attard Barbini, Tiziana Generali, Patrizia Pelosi, Silvana Girolimetti, Patrizia Stefanelli, Antonio Leonelli, Graziella Amendola, Luciano Vergori, Estefania Viana FresquetAbstract:Abstract The method studied uses a combination of a solid-matrix dispersion partition (SMDP) followed by high-performance size-exclusion chromatography on a minicolumn (HPmSEC) of 7.8 mm I.D. for the separation of pyrethroid (PYR) residues from fatty material. The solid-matrix dispersion extraction is carried out by absorbing a fat solution onto an Extrelut-3 cartridge (filled with a macroporous diatomaceous material) and extracting the PYR residues with acetonitrile. Up to 1 g of fatty material can be extracted with 15 ml acetonitrile. The small amount (mean±S.D.=12.4±5.9 mg) of fatty material which is eluted into the acetonitrile is further removed by HPmSEC. PYR pesticide residues are collected in a 2-ml fraction between 7 and 9 ml, the column being washed up to 24 ml. The two techniques used in series allow a better removal of fat, a greater input of sample and a lower consumption of solvent compared to the sole SEC on macrocolumns, and a lower limit of determination compared to the sole SEC on minicolumns. Recoveries of 9 PYR out of the 14 investigated residues from soya oil were in the range 66–83% at spiking levels ranging 0.49–2.57 mg/kg, while for 6 PYR residues tested at spiking levels in the range 0.13–0.53 mg/kg the recoveries were in the range 80–111%. Recovery of fluvalinate and permethrin could not be calculated due to interferences from soya oil, while λ-cyhalothrin, esfenvalerate and Tralomethrin gave low recovery. The final extract contains small amount (mean±S.D.=2.4±0.9 mg) of lipid residue and is not completely free from interferences.
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clean up of aqueous acetone vegetable extracts by solid matrix partition for pyrethroid residue determination by gas chromatography electron capture detection
Journal of Chromatography A, 1997Co-Authors: Alfonso Di Muccio, Danilo Attard Barbini, Tiziana Generali, Patrizia Pelosi, Antonella Ausili, Fabio Vergori, I CamoniAbstract:Disposable, ready-to-use cartridges filled with macroporous diatomaceous material are used to carry out a partition clean-up that, in a single step, is capable of transferring pesticide residues from aqueous acetone extracts into light petroleum-dichloromethane (75:25, v/v). This procedure takes the place of some functions (such as separatory-funnel partition, drying over anhydrous sodium sulphate and partial adsorption clean-up) usually performed by separate steps in classical schemes. Fourteen pyrethroid pesticides, including tefluthrin, tetramethrin, cyphenothrin, cyfluthrin, flucythrinate, τ-fluvalinate, deltamethrin, bioallethrin, fenpropathrin, λ-cyhalothrin, permethrin, α-cypermethrin, esfenvalerate and Tralomethrin were determined using the described procedure with satisfactory recoveries for most of them, at spiking levels ranging from 0.08 to 0.82 mg/kg for the different compounds. Crops subjected to the described procedure included strawberry, apple, and orange gave extracts containing a mass of co-extractives that was between 5 and 30 mg. Compared with classical schemes, the described procedure is simple, less labour intensive, allows parallel handling of several extracts and does not require the preparation and maintenance of equipment. Troublesome emulsions such as those frequently observed in separation funnel partitioning do not occur.