Mineralogical analysis of clays in hardsetting soil horizons, by X-ray fluorescence and X-ray diffraction using Rietveld method

Prandel, Luis Valério; Saab, Sérgio da Costa; Brinatti, André Maurício; Giarola, Neyde Fabíola Balarezo; Leite, Wellington; Cássaro, Fábio Augusto Meira

doi:10.1016/j.radphyschem.2012.12.017

Cited by 31 publications

(26 citation statements)

References 10 publications

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“…3), refinement index: S (1.24-1.58), R F 2 (1.96-6.54%), and R wp (7.26-10.30%) ( Table 2). These difference curves and index values were low and similar to other studies that analyzed soil clays using RM-XRD (20)(21)(22)(23).…”

Section: Resultssupporting

confidence: 89%

“…The Rietveld method (RM) is a refinement adjust based on least squares calculus between observed and calculated diffraction patterns by mathematical models of optic phenomena and instrumental factors of diffractometer, crystalline structures, crystallite size, microstrain and other sample characteristics (18,19). Thus, by employing refinement through RM with XRD data (RM-XRD), it is possible to quantify the proportions of minerals and refine the crystalline structure of minerals present in the soils and soil fractions (8,9,11,(20)(21)(22)(23).…”

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confidence: 99%

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X‐ray Diffraction and Rietveld Refinement in Deferrified Clays for Forensic Science

Prandel

Melo

Brinatti

et al. 2017

Journal of Forensic Sciences

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Soil vestiges might provide information about a crime scene. The Rietveld method with X-ray diffraction data (RM-XRD) is a nondestructive technique that makes it possible to characterize minerals present in the soils. Soil clays from the metropolitan region of Curitiba (Brazil) were submitted to DCB treatment and analyzed using XRD with CuK a radiation in the step-scan mode (0.02°2h/5 s). The GSAS+EXP-GUI software was used for RM refinement. The RM-XRD results, together with the principal component analysis (PCA) (52.6% total variance), showed the kaolinite predominance in most analyzed samples and the highest quartz contents in "site 1." Higher anatase, and gibbsite and muscovite contents influenced discrimination, mainly in "site 3" and "site 1," respectively. These results were enough to discriminate clays of four sites and two horizons using a reduced amount of sample showing that the technique can be applied to the investigation into soil vestiges.

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Section: Resultssupporting

confidence: 89%

mentioning

confidence: 99%

X‐ray Diffraction and Rietveld Refinement in Deferrified Clays for Forensic Science

Prandel

Melo

Brinatti

et al. 2017

Journal of Forensic Sciences

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“…The test was carried out at the Laboratory of Crystalchemistry and Micromorphology of Soils of the UFRPE Agronomic Unit of Garanhuns. The diffractograms of the clay fraction were interpreted considering the interplanar spacing (d), shape, width and intensity of the diffraction peaks (Jackson 1975, Prandel et al 2014). …”

Section: Chemical Characterizationmentioning

confidence: 99%

Potassium adsorption in soil cultivated with sugarcane

Freitas

Netto²,

Corrêa

et al. 2017

An. Acad. Bras. Ciênc.

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Vinasse is a byproduct of the process of distillation of sugarcane juice for the manufacture of sugar and alcohol. Because it is rich in nutrients, mainly potassium (K), is used as fertilizer and applied via fertigation, without concerning for the fate of this compound in the soil. Thus, the objective of the study was to evaluate the interactions of the potassium ion (K + ), applied via vinasse in a soil representative of the sugarcane zone of the State of Pernambuco using adsorption isotherms. The methodology was based on physical, chemical and soil mineralogical characterization, as well as equilibrium batch tests, where the experimental curves were fitted by Langmuir and Freundlich isotherm models. The results allowed to infer that the Freundlich model showed better fit of the curve in both forms: linear and non-linear (direct fit); the non-linear model was selected due to the values of coefficient of determination (R²). The interaction between potassium and soil occurred mainly with organic matter and the presence of soil kaolinite, because they showed negative ions on the external surface, thereby promoting potassium adsorption. Soil potassium adsorption capacity was higher for the first layer (0-20 cm) and decreased along the depth profile.

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“…Cohesive behavior is a characteristic found in soils around the world (Chartres et al, 1990;Dexter, 2004;Ley et al, 1989;McKyes et al, 1994;Mullins et al, 1990;Prandel et al, 2014;Schjønning and Thomsen, 2013), but fragipan presents different cohesive features, as cementation is minimized by the presence of water (Embrapa, 2013;FAO, 2006;Soil Taxonomy, 1999). However, some cohesive horizons can be hard even under wet conditions as a result of iron oxide (laterite), calcium carbonate (petrocalcic horizons) and Si (duripan) accumulation (Franzmeier et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

“…The predominance of kaolinite in relation to the 2:1 expandable mineral hampers the development of structural cracks on drying and favors the formation of fragipan horizons (Mullins et al, 1987;Prandel et al, 2014). The juxtaposition of high crystallinity kaolinite was the cause of cohesion in kaolinitic soils formed from sediments in Brazil (Giarola et al, 2009).…”

Section: Introductionmentioning

confidence: 99%