Data/hora: 11/06/2024 23:42:12

Biblioteca(s): 	Embrapa Solos.	
Data corrente: 	22/11/2002	
Data da última atualização: 	22/04/2024	
Autoria: 	PEREZ, D. V.; SALDANHA, M. F. C.; MOREIRA, J. C.; VAITSMAN, D. S.	
Afiliação: 	DANIEL VIDAL PEREZ, CNPS; MARCELO FRANCISCO COSTA SALDANHA, CNPS.	
Título: 	Evaluation of uranium, thorium and niobium concentrations in some Brazilian soils.	
Ano de publicação: 	1996	
Fonte/Imprenta: 	In: INTERNATIONAL COLLOQUIUM ON PROCESS RELATED TO ANALYTICAL CHEMISTRY IN ENVIRONMENTAL INVESTIGATIONS, 5., 1996, Gramado. Abstracts... Gramado: UFRGS, 1996. p. 27.	
Idioma: 	Inglês	
Conteúdo: 	Samples from superficial (A) and subsuperficial (B) diagnostic horizons of 15 Brazilian soils were analysed to determine the content of uranium, thorium and niobium (on a dry weight basis) by inductively coupled plasma - mass spectrocopy (ELAN 5000, Perkin-Elmer) following digestion with "aqua regia". A rande of 1.69 to 2.018 ug/kg for uranium were obtained for the superficial (A) horizons. A range of 0.47 to 937.6 ug/kg for niobium, 3.36 to 38.080 ug/kg for thorium and 1.28 to 2.298 ug/kg for uranium were obtained for the subsuperficial (B) horizons. In general except for Nb, soil samples of the B horizon showed higher contents of Th and U than those collected from the A horizon. The Pearson correlation, coefficients (all positives) were found in the A horizons between U and Fe (P<0.001), U and Th (P<0.01) Th and Fe (P<0.01), Nb and Fe (P<0.05). In the B horizons, only the correlation between U and Fe was significant (P<0.001).	
Palavras-Chave: 	Nióbio; Tório.	
Thesagro: 	Solo; Urânio.	
Categoria do assunto: 	P Recursos Naturais, Ciências Ambientais e da Terra	
Registro original: 	Embrapa Solos (CNPS)	
Exemplares: 	CNPS - (4798-1) - UPC - RA - PP - S 235 -  - 1998.00001 - DIS