Produção Nacional
Revisado por pares
Mineralogical analysis of ferralitic soils in Madagascar using NIR spectroscopy
2017; Elsevier BV; Volume: 168; Linguagem: Inglês
10.1016/j.catena.2017.07.016
ISSN1872-6887
AutoresVolaniaina H. Ramaroson, Thierry Becquer, Sandra Oliveira Sá, Hery Razafimahatratra, Jean Larvy Delarivière, Didier Blavet, Pedro Rodolfo Siqueira Vendrame, Lilia Rabeharisoa, Amos Fety Michel Rakotondrazafy,
Tópico(s)Mineral Processing and Grinding
ResumoThe applicability of near-infrared reflectance spectroscopy (NIRS) as tool for estimating mineral soil constituents was assessed over a wide range of highly weathered soils in Madagascar. The predictions were based on two types of methods, chemometric methods using multivariate calibration models from partial least squares (PLS) regressions, and the use of spectral signatures of specific minerals. The predictions of mineralogical properties of soils using chemometric methods were poor, except for the quantification of iron oxides extracted with citrate-bicarbonate dithionite (CBD) (R2cv = 0.80). Soil minerals (kaolinite, gibbsite, goethite and hematite) were also estimated by NIRS but with less accuracy (R2cv = 0.50–0.80). The predictions of kaolinite and gibbsite contents were improved by the use of the peak intensity of the first derivative spectra, situated at around 2205 nm for kaolinite and 2265 nm for gibbsite. The results indicate that NIRS can be used as a rapid analytical technique to simultaneously estimate the main minerals of highly weathered ferralitic soils with acceptable accuracy.
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