Spectrophotometric Determination of Methomyl Residues in Selected Vegetables, Crains, and Soil

Rangaswamy, J. R.; Prakash, Shimoga R.; Vijayashankar, Y. N.

doi:10.1093/jaoac/60.5.1093

Cited by 3 publications

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“…Thus, it is very necessary to nd simple and efficient analytical approaches for monitoring methomyl in aquatic environment. 1 Several complicated methods have been developed for methomyl monitoring in different matrices: thin layer chromatography (TLC), 2 gas chromatography (GC) using the alkali-ame ionization detector, 3 gas liquid chromatography (GLC) aer the hydrolysis of methomyl to the corresponding oxime(methyl-N-hydroxythioacetimidate), 4 GC-mass spectrometry (MS), 5 colorimetry aer hydrolysis, 6 high-performance liquid chromatography (HPLC), 7 counter-current chromatographytandem mass spectrometry (CCC-MS/MS), 8 capillary electrophoresis. 9 However, these methods have several limitations such as: extensive pre-treatment steps using toxic organic solvents, long analysis time, strong, advanced and expensive instrumentation which make these analytical methods unsuitable for real-time on-site analysis of this pollutant.…”

Section: Introductionmentioning

confidence: 99%

Development and validation of a new sensor for methomyl detection

Bouznit

Azzouz

2013

Anal. Methods

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Award Number: N00014-14-1-0425 https://www.sfos.uaf.edu LONG-TERM GOALS To promote the use of endocrine techniques to advance our knowledge of the physiology of cetaceans and their responses to change in their environment. OBJECTIVES Two objectives are being nested under the overall goal of developing techniques that can be used for the detection of stress and pregnancy in large whales. 1)The first objective is to develop and conduct analytical and preliminary biological validations of pregnancy and stress hormones for large whales (humpback whales, blue whales, and possibly insular false killer whales). 2) The second objective is to complete the biological validation using archived samples from whales with known life history or behaviors. APPROACH The project has a two year approach in which the first year will serve as the proof of concept and the second year will complete the validation and add in life history and behavior data. Details of each year's activities are separated below. Year 1-Commercially available radioimmunoassays (RIA) previously validated in other marine mammal species will be validated for corticosterone or cortisol and progesterone in humpback whale blubber. The validation will follow two forms, analytical and biological, described below. Analytical Validation: The analytical validation will be conducted using standard methods of parallelism, accuracy and metabolite identification using high-pressure liquid chromatography (HPLC). Briefly, pooled blubber extract from animals of known gender will be serially diluted 1:2 and run as samples, in duplicate, in the assay to determine displacement by the pool. Accuracy of the assay will be determined by spiking the pool at the appropriate dilution with known amounts of hormone then performing the assays. Mass of the pool will be calculated and subtracted from the mass measured

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Section: Introductionmentioning

confidence: 99%

Development and validation of a new sensor for methomyl detection

Bouznit

Azzouz

2013

Anal. Methods

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“…The efficiency of dimethoate against pests which include various sucking pests and its persistence on different plants was studied by several authors [l-51. The second pesticide, methomyl, is considered a nonphytotoxic systemic carbamate pesticide and is applicable to a wide range of crops [6]. Degradation of methomyl was studied on several crops [7-121. The object of the present study is to follow up the decline of both dimethoate and methomyl residues on tomato and cabbage plants in relation to their effect on some quality properties such as ascorbic acid content, total acidity, pH value, total soluble solids, and mineral contents.…”

Section: Introductionmentioning

confidence: 99%

Residues of dimethioate and methomyl on tomato and cabbage in relation to their effect on quality‐related properties

Othman

Antonįous

Khattab

et al. 1987

Enviro Toxic and Chemistry

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Dimethoate EC 40% and methomyl 90% WSP were applied under field conditions to follow up the decline of their residues on tomato and cabbage plants. The results indicate that the level of dimethoate and methomyl residues were found to be below tolerance level after 7 and 3 d from application, respectively. Dimethoate and methomyl residues also had significant effects on ascorbic acid contents in tomato fruits after 1 and 7 d for dimethoate, while the effect was after 3 and 10 d for methomyl. Dimethoate also showed significant effects on total soluble solids in tomato fruits presented until 14 d after pesticide application. Both dimethoate and methomyl had significant effect on both iron and magnesium content in tomato fruits and leaves and cabbage leaves during the 14 d.

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Analysis for N-Methylcarbamate Pesticides by High Performance Liquid Chromatography in Environmental Samples

Okamoto

Wijekoon

Esperanza

et al. 1991

Waste Testing and Quality Assurance: Third Volume

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This method was developed for the routine analysis of ten N-methylcarbamate pesticides in environmental aqueous and soil samples. Aqueous samples are extracted with dichloromethane, while soils are extracted with acetonitrile. The extracts are solvent exchanged to methanol prior to analysis. Analysis entails a high pressure liquid chromatographic separation on a C18 reverse phase column, post column derivatization and monitoring the resulting fluorophore by fluorescence detection. The standard derivatization procedure is based on alkaline hydrolysis of the N-methylcarbamate to yield methylamine, which in turn is reacted with o-phthalaldehyde (OPA) and 2-mercaptoethanol to form 1-(2-hydroxyethylthio)-2-N-methylisoindole. For routine quantitation the product is excited at 340 nm and the fluorescence emission detected through a 418 nm cut-off filter. Initial laboratory data indicate that method detection limits, precision and accuracy should be reasonable for routine environmental samples. The detection limits for clean water samples are estimated to be in the 1 to 10 ug/L range, while soil samples are estimated to be in the 10 to 50 ug/Kg range.

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Spectrophotometric Determination of Methomyl Residues in Selected Vegetables, Crains, and Soil

Cited by 3 publications

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Development and validation of a new sensor for methomyl detection

Development and validation of a new sensor for methomyl detection

Residues of dimethioate and methomyl on tomato and cabbage in relation to their effect on quality‐related properties

Analysis for N-Methylcarbamate Pesticides by High Performance Liquid Chromatography in Environmental Samples

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