Low Temperature Partitioning
Mostrando 1-12 de 23 artigos, teses e dissertações.
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1. A snapshot of the limnological features in tropical floodplain lakes: the relative influence of climate and land use
Resumo Objetivo O objetivo desse estudo foi investigar a influência relativa do clima (temperatura e precipitação) e do uso da terra nas características limnológicas de 30 lagoas da planície de inundação do Rio Araguaia, no Brasil Central, um importante rio que drena no Cerrado brasileiro. Métodos As lagoas foram amostradas em um mesmo período,
Acta Limnol. Bras.. Publicado em: 07/03/2019
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2. Pyrethroid insecticide residue in ‘Grande Naine’ banana peel and pulp during maturation
Abstract In banana farming, the bagging of bunches with bags impregnated by pyrethroid insecticide is a practice that prevents damage to fruits caused by insect pests. The aim of this study was to monitor the presence and permanence of bifenthrin residue during the maturation of ‘Grande Naine’ banana by gas chromatography coupled to mass spectrometer in
Food Sci. Technol. Publicado em: 30/07/2018
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3. OTIMIZAÇÃO DA EXTRAÇÃO SÓLIDO-LÍQUIDO COM PARTIÇÃO EM BAIXA TEMPERATURA PARA DETERMINAÇÃO DE CARBOFURANO EM Cucurbita pepo L (“ABOBRINHA”) POR CROMATOGRAFIA LÍQUIDA DE ALTA EFICIÊNCIA
According to results of the Program of Analysis of Pesticide Residues in Foods of the National Agency of Sanitary in Brazil (2013 to 2015) the zucchini, Cucurbita pepo L is one of the non-hardy vegetables, that presented higher contamination index by pesticides residues. One of these agrochemicals is carbofuran, which although not authorized for this crop, i
Quím. Nova. Publicado em: 2018-02
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4. Effect of Austenitizing Temperature on Mechanical Properties of the Mixed Bainite - Martensite Microstructure in CrMoV Steel
The effect of austenitizing temperature on mechanical properties of the mixed bainite - martensite microstructure in CrMoV steel was studied in the present work. The result showed that at low austenitizing temperature (910°C - 1000°C), the mixed microstructures containing 12-28% volume fraction of lower bainite showed higher yield and tensile strength than
Mat. Res.. Publicado em: 27/11/2017
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5. 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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6. A simple and efficient method employing solid-liquid extraction with low-temperature partitioning for the determination/monitoring of pesticide residues in strawberries by GC/ECD
O uso indiscriminado de agrotóxicos em morangos pode torná-los impróprios para consumo. Neste estudo, o método extração sólido-líquido com partição em baixa temperatura (SLE/LTP) acoplado a cromatografia gasosa com detector por captura de elétrons (GC/ECD) foi otimizado. O método proposto foi validado pela análise de amostras fortificadas do bra
J. Braz. Chem. Soc.. Publicado em: 2014-08
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7. Desenvolvimento do método de extração sólido-líquido com partição em baixa temperatura para determinação de inseticidas em grãos de milho ozonizados
The objective of this study was to optimize and validate a solid-liquid extraction method with low-temperature partitioning (SLE/LTP) for the analysis of pesticides. This method was coupled with gas chromatography (GC/ECD) and used to evaluate the degradation of bifenthrin and pirimiphos-methyl in maize grains on exposure to ozone. The optimized SLE/LTP-GC/E
Quím. Nova. Publicado em: 2014-04
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8. Determination of chlorpyrifos and thiamethoxam in potato tuber (Solanum tuberosum L.) and soil of Brazil using solid-liquid extraction with low temperature partitioning (SLE/LTP)
O principal objetivo deste trabalho foi avaliar a presença de resíduos de clorpirifós e tiametoxam em amostras de batata e solo em diferentes circunstâncias, após a otimização e validação da técnica de extração sólido-líquido e partição em baixa temperatura. Porcentagens de recuperação entre 93% e 105% foram obtidas para os pesticidas nas a
J. Braz. Chem. Soc.. Publicado em: 2013-12
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9. Determination of carbamates in beverages by liquid-liquid extraction with low temperature partitioning and liquid chromatography
Carbamatos são os pesticidas mais frequentemente encontrados em alimentos e bebidas de coloração escura em casos de intoxicação acidental ou intencional. Neste trabalho, extração líquido-líquido com partição em baixa temperatura (LLE-LTP) foi otimizada e validada para determinação dos carbamatos aldicarb, carbofuran e carbaril em bebidas de suco
Journal of the Brazilian Chemical Society. Publicado em: 2012-06
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10. Otimização e validação de metodologia para determinação de aldicarbe e carbofurano em amostras de café bebida / Optimization and validation of methodology for determination of aldicarb and carbofuran in coffee samples
Domestic use of aldicarb and carbofuran has resulted in accidental or even intentional poisonings, making it a severe public health problem. A mixture of "chumbinho" (aldicarb) in coffee is frequently a poisoning agent due to strong odor and color of coffee which hide the presende of "chumbinho". Thus, the objective of this study was to adapt, optimize and v
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/02/2010
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11. Cerrado assemblages of reptiles and amphibians along the drainage of Rio Tocantins and the impact of hydroelectric power plants on their conservation / Assembléias de répteis e anfíbios do Cerrado ao longo da bacia do rio Tocantins e o impacto do aproveitamento hidrelétrico da região na sua conservação
The Cerrado herpetofauna was studied along the basin of the Tocantins river using three distinct and complementary approaches. First, a fast sampling scheme, covering all the studied area, was conducted in 11 sites between the Central Plateau, in the state of Goiás, and the northern portion of the Tocantins depression, at the border of the states of Tocanti
Publicado em: 2007
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12. The "quenching and partitioning" process: background and recent progress
A new process concept, "quenching and partitioning" (Q&P) has been proposed recently for creating steel microstructures with retained austenite. The process involves quenching austenite below the martensite-start temperature, followed by a partitioning treatment to enrich the remaining austenite with carbon, thereby stabilizing it to room temperature. The pr
Materials Research. Publicado em: 2005-12