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Registros recuperados: 6
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Effect of temperature on dissipation of [14C] atrazine in a Brazilian soil. Repositório Alice
ANDREA, M.M. de; MATALLO, M.B.; TOMITA, R.Y.; LUCHINI, L.C..
A dissipacao do herbicida 14C-atrazina do solo foi estudada por extracoes com solventes, cromotografia em camada delgada e tecnicas radiometricas. Os resultados apresentados mostram que ela foi diretamente proporcional aos aumentos de temperatura. Quanto maior a temperatura, menos residuos extraiveis e mais residuos ligados foram detectados. Ao final dos periodos de incubacao, os extratos de solo mantidos a 10.C e a 20.C continham atrazina mas tambem seu derivado hidroxi, e a 30.C e 40.C, mais hidroxiatrazina do que atrazina. A energia de ativacao de Arrhenius calculada foi muito alta (96 kj.mol.), provando a predominancia de reacoes quimicas que favorecem a hidrolese. Analises exploratorias dos residuos ligados ao solo detectaram mais de 90% como...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Dissipacao; Degradacao quimica; Residuo; Contaminacao do solo; Dissipation; Chemical degradation; Residues; Soil contamination.
Ano: 1997 URL: http://www.alice.cnptia.embrapa.br/handle/doc/89589
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Enviromental behavior of sulfentrazone and fipronil in a Brazilian clayey latosol: field experiment and simulation Ciência e Agrotecnologia
Scorza Júnior,Rômulo Penna; Franco,André Andrade.
There has been an urgent need to assess pesticide environmental behavior under Brazilian field conditions and to evaluate the risks associated to its use in agriculture. Besides a qualitative and quantitative interpretation of field experiments to acquire understanding about pesticide environmental behaviour, field experiments are important to test pesticide fate models. Environmental behaviour of fipronil and sulfentrazone in a sugarcane area in Dourados, MS, was evaluated until 257 days after application. Moreover, the PEARL model was tested to simulate the fate of these two pesticides in the field. Soil samples for pesticide residue quantification and water content were taken at 0-10, 10-30, 30-50, 50-70 and 70-100 cm depth. There was a fast dissipation...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Leaching; Dissipation; PEARL; Risk assessment.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542014000500001
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Environmental Behaviour of Metolachlor and Diuron in a Tropical Soil in the Central Region of Brazil. Repositório Alice
DORES, E. F. G. C.; SPADOTTO, C. A.; WEBER, O. L. S.; CARBO, L.; VECCHIATO, A. B.; PINTO, A. A..
The environmental behaviour of metolachlor and diuron was studied in the Central-western region of Brazil, by means of a field study where six experimental plots were installed. The soil was classified as a Latosol, and the soil horizons were characterized. Sorption of metolachlor and diuron was evaluated in laboratory batch experiments. Metolachlor and diuron were applied to the experimental plots on uncultivated soil in October 2003. From this date to March 2004, the following processes were studied: leaching, runoff and dissipation in top soil. Koc of metolachlor varied from 179 to 264 mL g?1 in the soil horizons. Koc of diuron in the Ap horizon was 917 mL g?1, decreasing significantly in the deeper horizons. Field dissipation half-lives of metolachlor...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Sorption; Leaching; Runoff; Dissipation; Pesticides.
Ano: 2009 URL: http://www.alice.cnptia.embrapa.br/handle/doc/658650
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Environmental fate of S-Metolachlor: a review Planta Daninha
Zemolin,C.R.; Avila,L.A.; Cassol,G.V.; Massey,J.H.; Camargo,E.R..
S-metolachlor is a preemergent herbicide used for the control of annual grasses and small-seeded broadleaf weeds in more than 70 agricultural crops worldwide. Recently, Smetolachlor has been used to control imidazolinone-resistant red rice in rice-soybean rotation in lowland environments of the Southern Brazil. However, limited information concerning the environmental fate of S-metolachlor in lowland soil is available in the literature. Thus, this review was designed to describe the major transport and dissipation processes of Smetolachlor in attempting to improve weed management programs used in rice-soybean rotation and mitigate environmental contamination of lowland areas.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chloroacetamide; Degradation; Dissipation; Transport; Retention.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000300022
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Infragravity waves: from driving mechanisms to impacts ArchiMer
Bertin, Xavier; De Bakker, Anouk; Van Dongeren, Ap; Coco, Giovanni; Andre, Gael; Ardhuin, Fabrice; Bonneton, Philippe; Bouchette, Frederic; Castelle, Bruno; Crawford, Wayne C.; Davidson, Mark; Deen, Martha; Dodet, Guillaume; Guerin, Thomas; Inch, Kris; Leckler, Fabien; Mccall, Robert; Muller, Heloise; Olabarrieta, Maitane; Roelvink, Dano; Ruessink, Gerben; Sous, Damien; Stutzmann, Eleonore; Tissier, Marion.
Infragravity (hereafter IG) waves are surface ocean waves with frequencies below those of wind-generated "short waves" (typically be- low 0.04 Hz). Here we focus on the most common type of IG waves, those induced by the presence of groups in incident short waves. Three related mechanisms explain their generation: (1) the development, shoaling and release of waves bound to the short-wave group envelopes (2) the modulation by these envelopes of the location where short waves break, and (3) the merging of bores (breaking wave front, resembling to a hydraulic jump) inside the surfzone. When reaching shallow water (O(1-10 m)), IG waves can transfer part of their energy back to higher frequencies, a process which is highly dependent on beach slope. On gently...
Tipo: Text Palavras-chave: Infragravity waves; Bound wave; Dissipation; Reflection; Sediment transport; Barrier breaching; Seiche; Earth hum.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00417/52876/53800.pdf
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Swell dissipation by induced atmospheric shear stress ArchiMer
Perignon, Yves; Ardhuin, Fabrice; Cathelain, M.; Robert, M..
Observations of swell dissipation across oceans reveal a significant loss of energy that can be the result of many of processes. Among these candidate mechanisms, this paper examines the properties of the viscous air-sea boundary layer driven by swells in order to characterize the induced atmospheric flow regime and its associated viscous dissipation over swells. A series of 3-D numerical experiments is carried out with a RANS model and appropriate turbulence closure. These experiments reveal a laminar to turbulent transition in the near free-surface region for a common range of characteristic amplitudes and periods of swells under stationary conditions. At low Reynolds number, laminar conditions prevail and computed decay rates conform to the analytical...
Tipo: Text Palavras-chave: Swell; Dissipation; Shear; Turbulent.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00213/32405/30872.pdf
Registros recuperados: 6
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