scholarly journals Zn Speciation in the Organic Horizon of a Contaminated Soil by Micro-X-ray Fluorescence, Micro- and Powder-EXAFS Spectroscopy, and Isotopic Dilution

2004 ◽  
Vol 38 (10) ◽  
pp. 2792-2801 ◽  
Author(s):  
Géraldine Sarret ◽  
Jérome Balesdent ◽  
Lamia Bouziri ◽  
Jean-Marie Garnier ◽  
Matthew A. Marcus ◽  
...  
Keyword(s):  
Contaminated Soil ◽  
Exafs Spectroscopy ◽  
Isotopic Dilution ◽  
Organic Horizon ◽  
X Ray ◽  
Zn Speciation

Speciation and solubility of heavy metals in contaminated soil using X-ray microfluorescence, EXAFS spectroscopy, chemical extraction, and thermodynamic modeling

2006 ◽  
Vol 70 (9) ◽  
pp. 2163-2190 ◽  
Author(s):  
Tatiana A. Kirpichtchikova ◽  
Alain Manceau ◽  
Lorenzo Spadini ◽  
Frédéric Panfili ◽  
Matthew A. Marcus ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Thermodynamic Modeling ◽  
Contaminated Soil ◽  
Exafs Spectroscopy ◽  
Chemical Extraction ◽  
X Ray

scholarly journals Determination of Chemical Form of Antimony in Contaminated Soil around a Smelter Using X-ray Absorption Fine Structure

2005 ◽  
Vol 21 (7) ◽  
pp. 769-773 ◽  
Author(s):  
Masaki TAKAOKA ◽  
Satoshi FUKUTANI ◽  
Takashi YAMAMOTO ◽  
Masato HORIUCHI ◽  
Naoya SATTA ◽  
...  
Keyword(s):  
Fine Structure ◽  
Contaminated Soil ◽  
Chemical Form ◽  
X Ray ◽  
Absorption Fine ◽  
X Ray Absorption

scholarly journals Stabilization Study of a Contaminated Soil with Metal(loid)s Adding Different Low-Grade MgO Degrees

2020 ◽  
Vol 12 (18) ◽  
pp. 7340
Author(s):  
Jessica Giro-Paloma ◽  
Joan Formosa ◽  
Josep M Chimenos
Keyword(s):  
Contaminated Soil ◽  
Contaminated Soils ◽  
Low Grade ◽  
X Ray Diffraction ◽  
Optimal Stabilization ◽  
X Ray ◽  
Neutralization Capacity ◽  
Stabilizing Agents ◽  
Acid Test ◽  
By Products

Low-grade magnesium oxide (LG-MgO) was proposed as ordinary Portland cement (OPC) or lime substitute (CaO) for metal(loid)s remediation in contaminated soils. Some metal(loid)s precipitate at pH ≈ 9 in insoluble hydroxide form thus avoiding their leaching. LG-MgO avoids the re-dissolution of certain metal(loid)s at 9.0 < pH < 11.0 (pH-dependents), whose solubility depends on the pH. A highly contaminated soil with heavy metal(loid)s was stabilized using different LG-MgO by-products sources as stabilizing agents. Two of the three studied LG-MgOs were selected for the stabilization, by mixing 5, 10, and 15 wt.%. The effect of using LG-MgO not only depends on the size of the particles, but also on those impurities that are present in the LG-MgO samples. Particle size distribution, X-ray fluorescence (XRF), X-ray diffraction (XRD), thermogravimetric analysis, citric acid test, specific surface, bulk density, acid neutralization capacity, batch leaching tests (BLTs), and percolation column tests (PCTs) were techniques used to deeply characterize the different LG-MgO and the contaminated and remediated soils. The remediation’s results efficacy indicated that when the medium pH was between 9.0 and 11.0, the concentration of pH-dependent metal(loid)s decreases significantly. Although around 15 wt.% of a stabilizing agent was appropriate for the soil remediation to ensure an alkali reservoir that maintains optimal stabilization conditions for a long period, 5 wt.% of LG-MgO was enough to remedy the contaminated soil. When evaluating a polluted and decontaminated soil, both BLTs and PCTs should be complementary procedures.

scholarly journals EXAFS Spectroscopy of Some Iron(III) Compounds by Use of Dispersive-type In-laboratory X-Ray Spectrometer

1982 ◽  
Vol 55 (12) ◽  
pp. 3911-3914 ◽  
Author(s):  
Masaharu Nomura ◽  
Kiyotaka Asakura ◽  
Ukyo Kaminaga ◽  
Tadashi Matsushita ◽  
Kazutake Kohra ◽  
...  
Keyword(s):  
Exafs Spectroscopy ◽  
X Ray

X-ray diffraction, neutron scattering and EXAFS spectroscopy of monoclinic zirconia: analysis by Rietveld refinement and reverse Monte Carlo simulations

2002 ◽  
Vol 35 (4) ◽  
pp. 434-442 ◽  
Author(s):  
Markus Winterer ◽  
Robert Delaplane ◽  
Robert McGreevy
Keyword(s):  
Monte Carlo ◽  
Neutron Scattering ◽  
Rietveld Refinement ◽  
Local Structure ◽  
Exafs Spectroscopy ◽  
Scattering Data ◽  
Accurate Information ◽  
Reverse Monte Carlo ◽  
Monoclinic Zirconia ◽  
X Ray

Extended X-ray absorption fine structure (EXAFS) and neutron scattering data from monoclinic zirconia are analysed independently and simultaneously by reverse Monte Carlo (RMC) modelling. X-ray and neutron powder diffraction data are analysed by Rietveld refinement. The results are compared with respect to the local structure around the zirconium cations. Monoclinic zirconia was chosen as a model system for the comparison of structural information obtained by EXAFS spectroscopy and scattering methods because it is crystalline but also has some local disorder. In the case of zirconia, analysis of EXAFS spectra by RMC modelling results in reliable and accurate information on the local structure, consistent with neutron scattering and diffraction experiments.

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