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Type: Artigo de evento
Title: The Toxic Effect On Soil Microbial Activity Caused By The Free Or Immobilized Pesticide Diuron
Author: Prado A.G.S.
Airoldi C.
Abstract: The pesticide diuron (3-(3,4-dichlorophenyl)-1,1-dimethylurea) was anchored onto silica gel to yield a new surface. Both free and immobilized pesticide were applied on typical Brazilian agricultural soil and the toxic effects on microbial activity of this red Latosol soil was followed by microcalorimetry. The activity of the microorganisms on 1.50g of soil sample was stimulated by addition of 6.0mg of glucose plus 6.0mg of ammonium sulfate under 34.8% controlled humidity at 298.15±0.02 K. The activity was recorded through power-time curves for increasing amounts of the active principle, varying from 0 to 333.33 μgg-1. The increasing amounts of diuron, either free or immobilized, caused a decrease of the original thermal effect. The calorimetric data showed that the anchored pesticide presented a much lower toxic effect than free diuron on microbial activity. © 2002 Elsevier Science B.V. All rights reserved.
Rights: fechado
Identifier DOI: 10.1016/S0040-6031(02)00265-4
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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