Characterization and distribution of mineral phases in an Amazonian humiluvic Spodosol profile by XRPD, HR-TEM, SAED and SEM–EDX

H., J. L. Clabel; Nicolodelli, Gustavo; Senesi, Giorgio S.; Montes, Célia Regina; Perruci, N.A. Felicio; Bezzon, Vinícius Danilo Nonato; Milori, Débora Marcondes Bastos Pereira

doi:10.1007/s12665-021-09697-1

Cited by 5 publications

(9 citation statements)

References 36 publications

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“…As expected, the C emission line showed the highest relative intensity in soils from the surface horizon (A1 and A2), with a tendency to decrease and then accumulate again in the Bh and Tr horizons [4,21,22]. Differently, the Si emission line intensity was the highest in the E horizons, whereas the intensity of the Mg and Al emission lines appeared to follow a similar trend along the profile with the highest values for soils from deeper horizons where clay predominates [4]. The Ti emission line intensity was the highest in the Bh and E horizons, which suggests the large presence of titanium oxide in these horizons [4].…”

Section: Libs Spectrasupporting

confidence: 80%

“…The relative emission intensity of the Fe line varied along the profile with evidence of accumulation in the Bh and Bhs horizons, which confirms that the accumulation of this element may be associated with the formation process of these types of spodosols [6]. As expected, the C emission line showed the highest relative intensity in soils from the surface horizon (A1 and A2), with a tendency to decrease and then accumulate again in the Bh and Tr horizons [4,21,22]. Differently, the Si emission line intensity was the highest in the E horizons, whereas the intensity of the Mg and Al emission lines appeared to follow a similar trend along the profile with the highest values for soils from deeper horizons where clay predominates [4].…”

Section: Libs Spectrasupporting

confidence: 74%

“…Differently, the Si emission line intensity was the highest in the E horizons, whereas the intensity of the Mg and Al emission lines appeared to follow a similar trend along the profile with the highest values for soils from deeper horizons where clay predominates [4]. The Ti emission line intensity was the highest in the Bh and E horizons, which suggests the large presence of titanium oxide in these horizons [4]. Additionally, the emission line intensity of Ca was the highest in the Bh horizons, whereas the highest intensity of the K lines was featured in the Bh and Bhs horizons and the K horizons, which may be attributed to the presence of large amounts of quartz, kaolinite, and anatase [4] Figure 1.…”

Section: Libs Spectramentioning

confidence: 80%

“…For the analyses, the soil samples were pelletized (1 cm × 2 mm at approximately 0.5 g) with a hydraulic press. Detailed descriptions of these horizons and their mineralogical and chemical data can be found in [4,19,20].…”

Section: Soil Samplesmentioning

confidence: 99%

“…The Amazon rainforest features a very rich and complex biome of relevant global importance and is considered to be one of the most important and highly susceptible to climate change carbon sinks on Earth [1,2]. The spodosols below the Amazon rainforest are typically accumulating a great quantity of soil organic matter (SOM) on their surface and along their profile [3][4][5]; thus, a more extended study of them is extremely important. Laser-induced breakdown spectroscopy (LIBS) is a very versatile technique widely applied in several research areas, including the environmental sector, and offers the possibility of on-site measurements [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Characterization of an Amazon Soil Profile by Laser-Induced Breakdown, Raman, and Fluorescence Spectroscopies

Tadini

Senesi

et al. 2023

Minerals

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This work aimed to investigate, in detail, the elemental and molecular composition of soil samples collected from the various horizons of an Amazon spodosol profile by combining the atomic technique laser-induced breakdown spectroscopy (LIBS) with two molecular techniques, i.e., Raman and fluorescence spectroscopies. The emission lines of the elements Fe, C, Si, Mg, Al, Ti, Ca, and K with various relative intensities were detected by using LIBS. In particular, C appeared to accumulate in the transition horizon and was proven to be mostly humified by fluorescence analysis. The Raman peaks detected at 465 cm−1 and 800 cm−1 corresponded with the symmetric stretching and bending modes of O-Si-O and Si-OH, respectively. Small shifts toward higher frequencies and slight increases in the width and full width at half maximum (FWHM) of the quartz band at 465 cm−1 appeared in the Tr to K2 horizons, which could be ascribed to a local distortion caused by the high contents of Al of kaolinite mineral phases, as also shown by the LIBS data. Thus, a small amount of kaolinite mineral phase and K measured by LIBS would be present also in the A1 to E2 horizons. The lifetime fluorescence was almost constant in the surface and middle horizons, whereas it increased sharply in the transition horizon and then decreased slightly in the kaolin horizons, which confirmed the presence of more humified recalcitrant organic matter in deeper soil horizons. In conclusion, the combined use of the three spectroscopic techniques appeared to be a very promising approach for studying Amazon soils.

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