Data/hora: 14/06/2024 11:57:17

Biblioteca(s): 	Embrapa Instrumentação.	
Data corrente: 	22/12/1999	
Data da última atualização: 	02/03/2010	
Autoria: 	CRUVINEL, P. E.; NIELSEN, D. R.; CRESTANA, S.; FLOCCHINI, R. G.; MORALES, J. R.; MIRANDA, J.; KUSKO, B.	
Afiliação: 	EMBRAPA-CNPDIA; University of California; Universidad de Chile; Universidad Nacional de Mexico.	
Título: 	Studying the influence of the aggregate sizes on the trace elements of an ione oxisol with PIXE.	
Ano de publicação: 	1991	
Fonte/Imprenta: 	In: CONGRESSO BRASILEIRO DE CIENCIA DO SOLO, 23., jul. 1991, Porto Alegre, RS. Programa e resumos... Porto Alegre: Sociedade Brasileira de Ciencia do Solo, 1991.	
Páginas: 	p.62.	
Idioma: 	Inglês	
Notas: 	Ref.018.	
Conteúdo: 	The retention of certain trace elements through a saturated aggregated oxisol was studied under different aggregate sizes using the proton induced X-ray emission (PIXE) technique. This analytical technique is based on the ionization of the soil sample atoms by the incidence of a proton beam, and the subsequent emission of X-rays characteristic of the elements present in the sample. The number of X-rays photons of a given element provides information on the amount of this element, up to one part in 10E9. The results obtained show that an increase in aggregate size from < 0,5mm to 1,0 -4,7mm affected significatively the relative amounts of Cl,K, and Ca. The presence of Cl and Ca was greatest in the small aggregate fractions. The presence of K was greatest in the large aggregate fractions. These results, in particular for Cl and Ca, are indeed applicable and related to those obtained by Nkedi-Kizza. His miscible displacement techniques revealed that the transport and retention of Cl and Ca through a saturated aggregate oxisol were influenced by the size of the aggregates within the particular soil column studied.	
Palavras-Chave: 	Aggregate; Influence; Ione; PIXE; Size.	
Thesagro: 	Oxisol.	
Thesaurus Nal: 	trace elements.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Instrumentação (CNPDIA)	
Exemplares: 	CNPDIA - (5254-1) - UPC - SP - -- - PROCI-91.00024 -  - 1991.00024 - DIS