Data/hora: 03/06/2024 02:51:54

Provedor de dados: 	87	
País: 	Brazil	
Título: 	Atrazine and picloram adsorption in organic horizon forest samples under laboratory conditions	
Autores: 	Pinho,A.P.; Matos,A.T.; Morris,L.A.; Costa,L.M.	
Data: 	2007-03-01	
Ano: 	2007	
Palavras-chave: 	Herbicide retention; Litter layer; Sorption; Surface runoff; Solute transport.	
Resumo: 	Adsorption of two herbicides, atrazine and picloram, displaying different sorption characteristics, were evaluated for O (organic) horizon samples collected from SMZs (streamside management zones) in Piedmont (Ultisol) of Georgia, USA. Samples were randomly collected from within 5 SMZs selected for a study of surface flow in field trials. The five SMZs represented five different slope classes, 2, 5, 10, 15 and 20%. Results indicate that 0 horizons have the potential for sorbing atrazine from surface water moving through forested SMZs. Atrazine adsorption was nearly linear over a 24-hour period. Equilibrium adsorption, determined through 24-hour laboratory tests, resulted in a Freundlich coefficient of 67.5 for atrazine. For picloram, negative adsorption was observed in laboratory experiments. This seemed to be due to interference with ELISA analyses; however, this was not confirmed. The adsorption coefficient (Kd) obtained for atrazine in 0 horizons was greater than it would have been expected for mineral soil (from 1 to 4). Picloram was not sorbed in 0 horizons at any significant degree. Although there is a significant potential for the direct adsorption of soluble forms of herbicides in SMZs, the actual value of this adsorption for protecting water is likely to be limited even for relatively strongly sorbed chemicals, such as atrazine, due to relatively slow uptake kinetics.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582007000100013	
Editor: 	Sociedade Brasileira da Ciência das Plantas Daninhas	
Relação: 	10.1590/S0100-83582007000100013	
Formato: 	text/html	
Fonte: 	Planta Daninha  v.25 n.1 2007	
Fonte: 	info:eu-repo/semantics/openAccess