Data/hora: 07/06/2024 16:08:07

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