Data/hora: 04/06/2024 03:12:53

Biblioteca(s): | Embrapa Cerrados.
Data corrente: | 15/10/1996
Data da última atualização: | 15/10/1996
Autoria: | MADEIRA, J.; BEDIDI, A.; POUGET, M.; CERVELLE, B.; FLAY, N.
Título: | Spectral (MIR) determination of kaolinite and gibbsite contents in lateritic soils.
Ano de publicação: | 1995
Fonte/Imprenta: | Comptes Rendus de l'Academie des Sciences, serie IIa, t.321, 1995.
Páginas: | p.119-128.
Idioma: | Inglês
Conteúdo: | Kaolinite and gibbsite are the fundamental components of lateritic soils, along with rion oxides and oxyhydroxides and residual quartz. The relative proportion of these two minerals are a probe of the degree of development of these soils, which explains the importance of quantitative measurement. The relative proportion is usually determined using chemical analysis or X-ray diffraction, which are time consuming and costly techniques. A new procedure, based on diffuse reflectance spectroscopy, is proposed to estimate kaolinite and gibbsite abundances in lateritic soils. For kaolinite, the analysis concerned only the content in the clay fraction of the fine residue. In addition, an index was found, that could estimate accurately the ratio Ki=SiO2/Al2O3 in lateritic soils. These measurements may be conducted directly in the dield using a portable spectrometer.
Palavras-Chave: | Caulinita; Gibsita; Radiometria.
Thesagro: | Cerrado; Latossolo; Solo.
Thesaurus Nal: | Ferralsols; gibbsite; kaolinite; meteorological instruments; soil.
Categoria do assunto: | --
Registro original: | Embrapa Cerrados (CPAC)
Exemplares: | CPAC - (8894-1) - UPC - SP - -- - CRI4012 -  - CRI4012 - DIS