Evaluation of the Clay Fraction in some Danish Soils, Making Use of High-Gradrent Magnetic Separation (HGMS)
Titel:
Evaluation of the Clay Fraction in some Danish Soils, Making Use of High-Gradrent Magnetic Separation (HGMS)
Auteur:
Nehmdahl, Holger Møberg, Jens Peter
Verschenen in:
Acta agriculturae Scandinavica. Section B, Soil and plant science
Paginering:
Jaargang 42 (1992) nr. 2 pagina's 69-75
Jaar:
1992-06-01
Inhoud:
After removal of the 'free Fe-oxyhydroxides', a high-gradient magnetic separation (HGMS) procedure was used to separate the minerals of the clay fraction in soil samples from different horizons of two Alfisols, a Mollisol, an Ultisol and a Spodosol into a magnetic and a non-magnetic fraction. The magnetic fraction constituted 12-19% of the total clay fraction in the Alfisols, 28-35% in the Mollisol, 9-10% in the Ultisol and 11-16% in the Spodosol. X-Ray diffraction (XRD), Mossbauer spectroscopy and total elemental analysis (TEA) were used for the characterization of the different fractions. The CBD-treated magnetic clay contained mainly paramagnetic 2:1 layer silicate clay minerals, including hydroxy-interlayered clay minerals (HICM) high in Fe. The nonmagnetic clay was composed of diamagnetic minerals such as quartz, feldspars, gibbsite, kaolinite and the diamagnetic 2:1 layer silicate clay minerals.
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