Iron and aluminium oxides and the mineralogy of iron free clay fraction of acric oxisols
DOI:
https://doi.org/10.1590/S0103-90161995000300002Keywords:
clay mineralogy, iron and aluminium oxides, acric OxisolsAbstract
Total, free and amorphous iron and aluminium oxides were obtained from three acric Oxisols (two dusky-red latosol - LR and one Una variant latosol - LU) from the State of São Paulo, Brazil. These soils are in an advanced stage of weathering, having an effective CEC lower than 15 mmolc/kg clay. For all soils, the clay mineralogy was dominated by kaolinite and gibbsite, showing also some peaks of hidroxy-interlayered vermiculite. The LR had total, free and amorphous iron and aluminium contents higher than in the LU. In those soils, gibbsite represented more than 50% of iron free clay fraction of the Bw horizon, while in the LU the participation of kaolinite was higher (54% x 46%). In the Una variant latosol, with more intense yellow color, free aluminium represented 25% of the total, while in the LR it was 13%. The ratio specific surface area/free Fe-oxide was higher in the LU than in the dusky-red ones.Downloads
Download data is not yet available.
Downloads
Published
1995-12-01
Issue
Section
Articles
License
All content of the journal, except where identified, is licensed under a Creative Common attribution-type BY-NC.How to Cite
Iron and aluminium oxides and the mineralogy of iron free clay fraction of acric oxisols . (1995). Scientia Agricola, 52(3), 416-421. https://doi.org/10.1590/S0103-90161995000300002