Methyl Parathion
Mostrando 1-12 de 45 artigos, teses e dissertações.
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1. Chemically-Activated Biochar from Ricinus communis L. Cake and Their Potential Applications for the Voltammetric Assessment of Some Relevant Environmental Pollutants
Biochar is a rich-carbon material highly functionalized, which allows the use as electrodes modifier for preconcentration and voltammetric determination of several species. This work describes a castor cake biochar production and chemical activation with different reaction conditions using HNO3 and/or H2O2. Biochar samples were characterized using scanning e
J. Braz. Chem. Soc.. Publicado em: 2020-05
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2. Are Imidazoles Versatile or Promiscuous in Reactions with Organophosphates? Insights from the Case of Parathion
Is the broad mechanistic versatility of imidazole towards organophosphates (OPs), that has inspired many catalysts and sensors, beneficial? Herein, a thorough analysis is given seeking to unravel this puzzle. For OPs from the P=O family, imidazole attacks the phosphorus atom exclusively (N-phosphorylates). With the P=S family which are less reactive, an unus
J. Braz. Chem. Soc.. Publicado em: 21/10/2019
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3. EXTRAÇÃO EM FASE SÓLIDA DE RESÍDUOS DE AGROTÓXICOS DE ÁGUA SUPERFICIAL, EMPREGANDO UM SORVENTE DE MENOR RETENÇÃO
Solid phase extraction (SPE) is one of the main sample preparation techniques. However, the cost of cartridges and the strong retention of hydrophobic compounds in traditional solid phases are limiting factors for their use. This paper describes the application of lab-made SPE cartridges with low retention material as solid phase, Si(PDAS) - poly(dimethyl-co
Quím. Nova. Publicado em: 2018-06
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4. ORGANOCLORATED AND ORGANOPHOSPHORUS PESTICIDES IN THE PELOTAS RIVER SEDIMENT
ABSTRACT Aquatic sediments are widely used for the evaluation of anthropogenic contamination due to their ability to adsorb particles and contaminants, making them historical environmental archives. Therefore, the objective was to evaluate the contamination of the Pelotas River sediments, at the border between the states of Santa Catarina and Rio Grande do S
Eng. Agríc.. Publicado em: 2018-01
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5. DLLME-GC/ECD Method for the Residual Analysis of Parathion-Methyl and its Application in the Study of the UV-Photodegradation Process
A new method has been developed to determine trace levels of organophosphorus pesticide parathion-methyl in water samples by using dispersive liquid-liquid microextraction (DLLME), followed by gas chromatograph coupled with electron capture detector (GC/ECD) analysis. The optimized and validated method showed high extraction recovery (101.1%), high enrichmen
J. Braz. Chem. Soc.. Publicado em: 2017-11
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6. Strategy for Correction of Matrix Effect on the Determination of Pesticides in Water Bodies Using SPME-GC-FID
This paper investigates a strategy as a quality control parameter, using standard surrogate and determination of a relation factor for determination of parathion-methyl, chlorpyriphos and cypermethrin pesticides in environmental aqueous matrices with distinct characteristics (river water, estuarine, seawater and weir water), using the technique of solid phas
J. Braz. Chem. Soc.. Publicado em: 2017-06
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7. Evaluation of the Effects of Hofmeister Series on Salting Out in the Determination of Organophosphorous Pesticides and Pyrethroids by LDS/DLLME
Various greener microextraction procedures have been proposed with low limits of detection to control of pesticides present in the environment, including the low-density solvent dispersive liquid‑liquid microextraction (LDS/DLLME) technique. The addition of electrolytes is important in order to induce the salting-out effect. Thus, it is possible to use the
J. Braz. Chem. Soc.. Publicado em: 2015-09
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8. Determination of Pesticides in Soil Using a Hyphenated Extraction Technique
A new method for the extraction of pesticide residues from soil was developed, optimized, validated and applied to real samples. The technique consisted of combining single-drop microextraction and solid-liquid extraction with low temperature partitioning (SLE/LTP-SDME) followed by analysis using gas chromatography with electron capture detection (GC/ECD). T
J. Braz. Chem. Soc.. Publicado em: 2015-09
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9. Flow Injection Analysis System for Screening Organophosphorus Pesticides by their Inhibitory Effect on the Enzyme Acethylcholinesterase
A flow-injection spectrophotometric procedure was developed for screening organophosphorus pesticides. The method is based on the inhibition of acetylcholinesterase immobilized on controlled porous glass beads with acetylcholine chloride as the substrate. Methyl parathion, chlorpyrifos, malathion and dichlorvos have been tested. The analytical peak height fo
J. Braz. Chem. Soc.. Publicado em: 2015-03
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10. Compatibility of conventional agrochemicals used in rice crops with the entomopathogenic fungus Metarhizium anisopliae
The toxicological impact of chemical pesticides on fungal entomopathogens and their use in tank-mixing can be directly measured through in vitro compatibility tests. This study reports the in vitro toxicity of eight insecticides, four fungicides and five herbicides in the conidial germination, vegetative growth and conidiation of Metarhizium anisopliae (stra
Sci. agric. (Piracicaba, Braz.). Publicado em: 2013-06
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11. Avaliação da exposição ocupacional a praguicidas organofosforados em estufas de flores na região do Alto Tietê - São Paulo / Evaluation of occupational exposure to organophosphate pesticides in greenhouses of flower in the Alto Tietê region, state of S. Paulo, Brazil
The state of São Paulo - Brazil, accounts for 70% of domestic production of flowers and ornamental plants. Currently, these crops occupy 7.5 thousand hectares and over 50% of this area is cultivated in greenhouses. This market has an average of 8.000 producers and generates around 200.000 jobs. Greenhouses are microcosms designed to provide environmental co
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/09/2011
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12. Fatores que afetam a germinacao do grao de polen do maracuja: meios de cultura e tipos de agrotoxicos.
Foram conduzidos estudos para selecao de temperatura, meio de cultura e tempo de incubacao ideais para germinacao de graos de polen do maracuja-amarelo (Passiflora edulis f.flavicarpa), com a finalidade de adequar o metodo de avaliacao da interferencia de agrotoxicos. A temperatura de 28+ou- 0,5 graus C. e o meio com 50 g/L de sacarose; 0,2 g/L de acido bori
Pesquisa Agropecuaria Brasileira. Publicado em: 2011