was only detected in the LV-PF and LV-PG soils, its peak being more pronounced for the LV-PG soil.
Based on Soil Survey Staff , Oxisols and Utisols are highly weathered soils, and mainly dominated by gibbsite
, kaolinite and goethite in their clay fraction.
Polymer encapsulated gibbsite
nanoparticles: efficient preparation of anisotropic composite latex particles by RAFT-based starved feed emulsion polymerization.
Probably, this fact is due to the low acidity, MPAC and absence of gibbsite
in the mineralogical composition of the studied soils, besides the lower contents of Fe and Al oxides, which may have favored the release of P to the solution, since gibbsite
, absent in the soils, is responsible for a large part of P adsorption in the soils (Vilar et al.
Ferrosialitic lateritic profiles formed on Cretaceous and Paleogene islands arcs consist of secondary minerals such as gibbsite
, kaolinite, goethite, hematite and montmorillonite, while those associated with basic and volcanogenic-sedimentary rocks of ophiolitic affinity in Cayo Guam are composed of gibbsite
and iron oxides.
with [gamma]-AlOOH boehmite inclusions while other samples are poorly crystallized or in the X-ray amorphous state (Fig.
Comparison of Raman spectra in characterizing gibbsite
, bayerite, diaspore and boehmite.
From XRD analysis, the laterite soil contains kaolinite, muscovite, gibbsite
and quartz but dominantly was kaolinite.
Structurally, it is made up of alternate octahedral gibbsite
and tetrahedral silica layers giving a platy structure.
The hump near 300[degrees]C in Figure 3a and near 350[degrees]C in Figure 3b can be assigned to the dehydroxylation of gibbsite
(y-Al(OH)3) present in the dawsonite sample [2, 13].
Figure 1 shows that the clay fraction of the samples analyzed contained the following minerals: kaolinite, gibbsite
, goethite and vermiculite with hydroxy-interlayered Al.
Mineralogical investigations show that gibbsite