Characterization of oil shale residue and rejects from irati formation by electron paramagnetic resonance

Cogo, S.L.; Brinatti, André Maurício; Saab, Sérgio da Costa; Simões, Marcelo Luiz; Martin‐Neto, Ladislau; Rosa, J.A.; Mascarenhas, Yvonne P.

doi:10.1590/s0103-97332009000100005

Cited by 9 publications

(6 citation statements)

References 7 publications

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“…Moreover, the hyperfine structure of the EPR spectrum (when it is well resolved) provides more important information about the radical than the g-value, because most radicals detected are carbon or nitrogen centered radicals and the spectra positions are almost in the same magnetic field range [1]. The EPR technique has been widely used for long time in the identification of irradiation damage centers in many substances including drugs, amino acid and iminodiacetic acid derivatives [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. L-glutamine and iminodiacetic acid powders were gamma-irradiated and studied by EPR at room temperature [19,20].…”

Section: Introductionmentioning

confidence: 99%

EPR study of gamma induced radicals in amino and iminodiacetic acid derivatives

Aydin¹,

Başkan²,

Osmanoglu³

2009

Braz. J. Phys.

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In this study, electron paramagnetic resonance spectroscopy was used to investigate free radicals formed in gamma irradiated L-glutamine hydrochloride, iminodiacetic acid hydrochloride and N-(2-hyroxyethyl) iminodiacetic acid powders. The free radicals produced in L-glutamine hydrochloride powders were attributed to the CH 2Ċ HCOOH radical; and those in iminodiacetic acid hydrochloride and N-(2-hyroxyethyl) iminodiacetic acid powders to the HNCHCH 2 (COOH) 2 and HOCH 2 CH 2 NĊHCH 2 (COOH) 2 , respectively. The g-values of the radicals and the hyperfine structure constants of the free electron with the environmental protons and 14 N nucleus were determined. The samples were not displayed before they were not irradiated. The free radicals were found stable at room temperature for more than six months. Some spectroscopic properties and suggestions concerning possible structure of the radicals are discussed in this paper.

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Section: Introductionmentioning

confidence: 99%

EPR study of gamma induced radicals in amino and iminodiacetic acid derivatives

Aydin¹,

Başkan²,

Osmanoglu³

2009

Braz. J. Phys.

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“…To the best of our knowledge, this is the first report of a well-determined spectrum of Mn 2+ in crude oil. A not so clear spectrum due to Mn 2+ impurities was reported for a Venezuelan oil, and the presence of Mn 2+ in oil shale and sand bitumen is well-known.…”

Section: Resultsmentioning

confidence: 95%

Study of the Factors Responsible for the Rheology Change of a Brazilian Crude Oil under Magnetic Fields

et al. 2011

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Recently, some works showed that magnetic fields may reduce the paraffin crystallization and the viscosity of some types of oil. This Article shows the main results obtained in an attempt to determine some factors responsible for the oil interaction with magnetic fields, which caused the rheological properties change in crude oil samples. Under the influence of a magnetic field (1.3 T in 1 min exposure), one of the six brazilian crude oil samples studied (sample 1) showed 39% reduction on its viscosity and a reduction on the viscoelastic properties (loss modulus and storage modulus). However, the other five samples did not show any considerable modification of their rheological properties. We analyzed all six samples using spectroscopy to detect what kind of component was present in sample 1 that could interact with the magnetic field and cause the aforementioned rheological properties change and that was not present in the other samples. The major differences observed in sample 1 were the presence of the Mn 2+ paramagnetic ion (EPR spectroscopy); Sr and Br (XRF spectroscopy); highest aromatic/aliphatic molecules ratio (NMR spectroscopy); and the highest water content (10% v/v, NMR spectroscopy). Thus, the results show that the paraffin could not be the unique factor responsible for the change on the rheological properties of the crude oil samples caused by magnetic fields, as some authors suggested previously.

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“…In contrast with the isotropic X-band spectra, W-band spectra of diesel were found to show poorer signal-to-noise ratios and anisotropy in the A-and g-parameters 131 . EPR has also been used to characterise oil shale residue and rejects, calschist, shale file and retorted shale from the Irati formation in Brazil 132 . A study was reported of various fuel-samples made using ESR.…”

Section: Fuel-related Applicationsmentioning

confidence: 99%

Electron Spin Resonance. Part two: A Diagnostic Method in the Environmental Sciences

Rhodes

2011

Science Progress

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A review is presented of some of the ways in which electron spin resonance (ESR) spectroscopy may be useful to investigate systems of relevance to the environmental sciences. Specifically considered are: quantititave ESR, photo-catalysis for pollution control; sorption and mobility of molecules in zeolites; free radicals produced by mechanical action and by shock waves from explosives; measurement of peroxyl radicals and nitrate radicals in air; determination of particulate matter, polyaromatic hydrocarbons (PAH), soot and black carbon in air; estimation of nitrate and nitrite in vegetables and fruit; lipid-peroxidation by solid particles (silica, asbestos, coal dust); ESR of soils and other biogenic substances: formation of soil organic matter, carbon capture and sequestration (CCS) and no-till farming; detection of reactive oxygen species in the photosynthetic apparatus of higher plants under light stress; molecular mobility and intracellular glasses in seeds and pollen; molecular mobility in dry cotton; characterisation of the surface of carbon black used for chromatography; ESR dating for archaeology and determining seawater levels; measurement of the quality of tea-leaves by ESR; green-catalysts and catalytic media; studies of petroleum (crude oil); fuels; methane hydrate; fuel cells; photovoltaics; source rocks; kerogen; carbonaceous chondrites to find an ESR-based marker for extraterrestrial origin; samples from the Moon taken on the Apollo 11 and Apollo 12 missions to understand space-weathering; ESR studies of organic matter in regard to oil and gas formation in the North Sea; solvation by ionic liquids as green solvents, ESR in food and nutraceutical research.

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Characterization of oil shale residue and rejects from irati formation by electron paramagnetic resonance

Cited by 9 publications

References 7 publications

EPR study of gamma induced radicals in amino and iminodiacetic acid derivatives

EPR study of gamma induced radicals in amino and iminodiacetic acid derivatives

Study of the Factors Responsible for the Rheology Change of a Brazilian Crude Oil under Magnetic Fields

Electron Spin Resonance. Part two: A Diagnostic Method in the Environmental Sciences

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