Scanning and transmission analytical electron microscopy (STEM-EDX) identifies minor minerals and the location of minor elements in the clay fraction of soils

Batista, Araína Hulmann; Melo, Vander Freitas; Gilkes, Robert

doi:10.1016/j.clay.2016.10.032

Cited by 13 publications

(6 citation statements)

References 16 publications

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“…Mineral analysis with XRD can distinguish between different mineral phases of very similar chemistry; however, routine powder XRD is not feasible to study the sand fraction where there is a predominance of quartz. Mineral phases in concentrations below 40 g kg -1 are not precisely identified by XRD (Bong et al, 2012;Batista et al, 2017). Thus, investigations of the morphological aspects of quartz grains should be prioritized in tropical and subtropical soils and an important technique to verify subtle differences in the morphology of this mineral is the scanning electron microscope coupled to the energy dispersive X-ray spectrometer (SEM-EDS).…”

Section: Introductionmentioning

confidence: 99%

Sand fraction is not suitable for forensic investigations in subtropical soils

Melo

Testoni

Dawson

et al. 2020

Revista Brasileira De Ciência Do Solo

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Section: Introductionmentioning

confidence: 99%

Sand fraction is not suitable for forensic investigations in subtropical soils

Melo

Testoni

Dawson

et al. 2020

Revista Brasileira De Ciência Do Solo

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“…The soil is composed of wide variety of elements, some of these elements when available in extreme amounts are detrimental to plants and these includes aluminium and lead, others are used by plants in various chemical and metabolic processes to facilitate their growth, development and reproduction. In addition, their insufficiency may result to poor growth and yield problems in agricultural practices (Batista et al, 2017). The availability of chemical elements may vary in all soils according to the conditions acting on their formative processes; this plays a vital role in soil fertility, since mineral surfaces serve as potential sites for nutrient storage .…”

Section: Introductionmentioning

confidence: 99%

Energy dispersive X-Ray fluorescence determination of minor and major elements in soils of Mambilla Plateau Northeastern Nigeria

Isaac¹,

Maitera²,

Donatus³

et al. 2019

J. Environ. Chem. Ecotoxicol.

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This study focuses on energy dispersive X-ray fluorescence determination of minor and major elements in selected soils of Mambilla Plateau. The 12 sampled soil composites analysed were done by energy dispersive X-ray fluorescence technique for minor and major elements. The elemental oxides determined were Al 2 O 3 , CaO, K 2 O, TiO 2 , SiO 2 , BaO, Fe 2 O 3 , and MnO. The result obtained in the study showed that the general percentage concentration of elemental values were in decreased order of Si>Al>Ti>K>Ca for major elements and Fe>Mn>Ba minor elements accordingly. The major elements category showed silicon as the highest mean concentration at location S 84.09%±6.40 and calcium lower mean concentration with value of 0.32%±0.02. The minor elements concentration percentage revealed Fe with a mean value at location N 23.18%±3.1 being the highest and Ba is the lowest at location S 0.14%±0.1. The soil analysis revealed low concentration of essential major and minor elements, however, high concentration of Al and Fe that may solubilized at low pH and splitting H + from water molecule showed increased soil acidity.

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“…The presence of minor quantities of Si and Ca in this analysis may be the result of contamination by silicate mineral(s) on the surface of particle 2. Pure particles with the ideal chemical composition of minerals are exceptional, as most grains are associations of particles (Batista et al, 2017). Particle 3 has 3.4 % Pb ( Figure 5, Table 3) and it occurs in the form of secondary precipitations of Fe-Mn-Pb oxide.…”

Section: Areamentioning

confidence: 99%

“…Association of P with Pb was found by Batista et al (2017) using XRD, and the main host of Pb in the clay fractions of soils in the South of Brazil was plumbogummite [PbAl 3 (PO 4 ) 2 (OH) 5 .H 2 O]. However, minerals in the soil fraction that are present at contents below about 10 g kg -1 cannot be detected by XRD (Brindley and Brown, 1980).…”

Section: Introductionmentioning

confidence: 99%

“…The analysis of isolated crystals is the only way to accurately identify the mineral source of structural forms of heavy metals in soil fractions (Batista et al, 2017). The scanning electron microscope (SEM) equipped with an energy dispersive X-ray spectrometer (EDS) has been used in several areas of soil science, such as discrimination of forensic soil (Cengiz et al, 2004), environmental chemistry (Teršič, 2011;Umar and Adamu, 2015), and soil genesis (Simas et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Identification of Heavy Metals in Crystals of Sand and Silt Fractions of Soils by Scanning Electron Microscopy (SEM EDS/WD-EPMA)

Batista

Melo

Gilkes

et al. 2018

Rev. Bras. Ciênc. Solo

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Studies of heavy metals are concentrate on clay fractions, but coarser fractions of the soil can constitute significant sources of structural forms of heavy metals. The aim of this study was to evaluate the occurrence of heavy metals in the structure of minerals of the sand and silt fractions of soils from three different parent materials (metamorphic rocks and granite) in southern Brazil using SEM/EDS -Scanning Electron Microscopy with Energy Dispersive Spectroscopy and with WD-EPMA -with Wavelength Dispersive-Electron Probe Microanalysis. We sampled soils from two areas naturally rich in heavy metals, with high mineral deposits (galena -PbS) hosted in carbonate rocks and phyllite/mica schist. The main form of Ba in the sand and silt fractions was as barite (BaSO 4 ). The precipitation of Ba and S from the soil solution occurred on the surface of silicate mineral particles. Due to the proximity of ionic radius of Ba-Pb, there was isomorphic substitution of Ba for Pb in the barite structure. The only primary mineral source of Pb in the coarse soil fractions was trioctahedral mica. Several secondary minerals in the silt and sand are sources of structural Pb: plumbogummite, plumboferrite, magnetoplumbite, and cerussite. There was a strong geochemical association of Pb-Fe-Mn. Zinc was also associated with Fe. The SEM/EDS/WD-EPMA techniques are important analyses to complement standard procedures, such as X-ray diffraction and total chemical digestion, in geochemical studies.

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Scanning and transmission analytical electron microscopy (STEM-EDX) identifies minor minerals and the location of minor elements in the clay fraction of soils

Cited by 13 publications

References 16 publications

Sand fraction is not suitable for forensic investigations in subtropical soils

Sand fraction is not suitable for forensic investigations in subtropical soils

Energy dispersive X-Ray fluorescence determination of minor and major elements in soils of Mambilla Plateau Northeastern Nigeria

Identification of Heavy Metals in Crystals of Sand and Silt Fractions of Soils by Scanning Electron Microscopy (SEM EDS/WD-EPMA)

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