Clay Minerals Identified in Red Quaternary Deposits, From Valea Anilor Area (Mehedinţi County, Romania), Using XRD and Ir Absorbtion Analysis

Negreanu, Stefan; Soare, Barbara; Avram, Sorin

doi:10.26471/cjees/2018/013/038

Cited by 3 publications

(2 citation statements)

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“…The supplementary band indicated in the literature at 426 cm −1 , corresponding to Si-O vibrations [47], is not shown in our table because it cannot be seen in our FTIR spectra. This band was attributed to the presence of kaolinite [58], so that its absence from our measurements indicates the absence of this mineral from the sample.…”

Section: Ft-ir Spectra Of Montmorillonitementioning

confidence: 79%

Mineralogical and Physico-Chemical Characterization of the Oraşu-Nou (Romania) Bentonite Resources

Damian

Szakács

et al. 2021

Minerals

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The objective of this study is to describe the mineralogical composition and chemical properties of the Oraşu Nou bentonite, from northwestern Romania. For mineralogical determinations, the following were used: X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FR-IR), thermogravimetric analysis, scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM-EDX). The chemical compositions and physical properties of the bentonites and bentonitized rocks were also determined. Calcium type montmorillonite is the predominant mineral in this deposit. Its average mass fraction is between 35% and 75%, reaching up to 95%. A small amount of halloysite and very fine cristobalite were also identified in the fine fraction. Quartz, feldspar, and kaolinite were identified as impurities. The average pH of natural bentonite is 6.2. Its cation exchange capacity (CEC) is in the lower-middle range for smectites at 45.89 cmol/kg, absorption capacity 43.58 mL/g, swelling degree 9.41%. Because of the high amounts and purity of montmorillonite, the valuable component mineral, the way is open to an easy refinement of this important resource. This way very high-quality colloidal suspensions can be obtained which can be used in the most modern applications of micro- and nanostructured materials.

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Section: Ft-ir Spectra Of Montmorillonitementioning

confidence: 79%

Mineralogical and Physico-Chemical Characterization of the Oraşu-Nou (Romania) Bentonite Resources

Damian

Szakács

et al. 2021

Minerals

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“…Bulk calcite occurs in marble with a polycrystalline structure based on microscopic crystallites well pressed together during geological conditions [ 16 , 17 ]. However, calcite and micro-sized quartz particles are reported in the eroded sedimentary soils of Vitis Vinifera culture areas by Nagy et al [ 18 ] and are a common presence in the muscovite and kaolinite clay soils as observed by Negreanu et al [ 19 ].…”

Section: Resultsmentioning

confidence: 99%

Material Evidence of Sediments Recovered from Ancient Amphorae Found at the Potaissa Roman Fortress

et al. 2023

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Methods for material investigation are powerful tools that allow specialists to elucidate important aspects regarding ancient artifacts such as the Roman amphorae deposits discovered at Potaissa Fortress in Turda, Romania. Archeological debate states that the deposit contained olive oil and wine amphorae, but no material evidence has been presented until now. The current research is focused on the most representative large amphora fragments found in the Potaissa deposit, with a significant amount of sediment on their walls, to give archeologists the material proof to elucidate their debate. Sediment was collected from each fragment and subjected to complex analysis. XRD investigation combined with cross-polarized light microscopy demonstrated mineral particles such as quartz, clay (muscovite and traces of biotite), and calcite. Quartz and calcite particles have a rounded shape and diameters in a range of 20–200 µm, and clay particles have a lamellar shape and dimensions from 1 to 20 µm, a fact confirmed by SEM microscopy. Sample 2 presented a large amount of amorphous phase followed by Samples 1 and 3, with a low amount of organic phase. FTIR investigation confirms organic phase presence owing to strong absorption bands regarding C-H, C=O, and O-H chemical bonds related to aliphatic compounds in Sample 2, and to some decayed wine residue in Samples 1 and 3. EDS elemental analysis was used for organic particle identification in the amphora sediments and to obtain a correlation with their microstructure. GC–MS investigation showed volatile compounds related to wine residue for Samples 1 and 3 and decomposed fats for Sample 2. Tartaric and malic acid were identified by HPLC in Samples 1 and 3, which are wine biomarkers. The correlation of all experimental results concludes with no doubt that Amphora 2 contained olive oil and Amphorae 1 and 3 contained wine in ancient times.

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Mixed-Layered Illite/Smectite - A Key to Understanding the Evolution of Focşani Basin (Romania)

Soare¹

2020

Carpath. J. Earth Environ. Sci.

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Clay Minerals Identified in Red Quaternary Deposits, From Valea Anilor Area (Mehedinţi County, Romania), Using XRD and Ir Absorbtion Analysis

Cited by 3 publications

References 0 publications

Mineralogical and Physico-Chemical Characterization of the Oraşu-Nou (Romania) Bentonite Resources

Mineralogical and Physico-Chemical Characterization of the Oraşu-Nou (Romania) Bentonite Resources

Material Evidence of Sediments Recovered from Ancient Amphorae Found at the Potaissa Roman Fortress

Mixed-Layered Illite/Smectite - A Key to Understanding the Evolution of Focşani Basin (Romania)

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