Identification of jarosite and other major mineral Fe phases in acidic environments affected by mining-metallurgy using X-ray Absorption Spectroscopy: With special emphasis on the August 2014 Cananea acid spill

The sulfuric acid spill into the Sonora river, enriched in iron and copper ions from the Buenavista del Cobre mine (Cananea), gave way to the formation of various solid iron (Fe) phases. In this study, the mineral phases were identified by X-ray Absorption Spectroscopy (XAS) and bulk powder X-Ray Diffraction (XRD), and chemically through acid digestions for multielemental quantification, as well as a 3-step selective sequential extraction (SSE) to quantify the types of Fe oxide phases and the contribution of the associated elements. Jarosite was the only Fe mineral identified by XRD, but XAS allowed identification of jarosite with potentially toxic elements (PTEs) incorporated in its structure, making these elements less prone to leaching. In addition, very poorly crystalline phases such as schwertmannite and ferrihydrite were identified in several samples through XAS, which was confirmed by SSE. These phases are probably associated with PTEs. Other possible adsorbent Fe(III) minerals were also identified by XAS, such as maghemite and goethite; as well as mixed Fe(II)-Fe(III) minerals, such as green rust. It was possible to infer the influence of the acid spill on the different sampled areas through various Fe phases identified and/or the presence of gypsum. The influence was detected to be lower where the mineralogy was not associated to low pH and high sulfate concentrations. All precipitated Fe(III) phases downriver from the acid spill are known for their high retention capacities of PTEs either from incorporation into their structures and/or from surface adsorption, thus, contributing to the immobilization of the initial metal(loid) pollution caused by the acid spill. In addition, several other samples of mining-metallurgical wastes were analyzed by the same three techniques, suggesting many of the findings from the secondary Fe mineralogy of the Buenavista del Cobre mine acid spill as common processes occurring in mining-affected environments.

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The Relative Merits of Oxides of Hafnium, Cerium and Thorium as Surrogates for Plutonium Oxide in Calcium Phosphate Ceramics

MRS Proceedings ◽

10.1557/proc-1193-79 ◽

2009 ◽

Vol 1193 ◽

Cited By ~ 1

Author(s):

B. L. Metcalfe ◽

S. K. Fong ◽

L. A. Gerrard ◽

I. W. Donald ◽

E. S. Welch ◽

...

Keyword(s):

Calcium Phosphate ◽

Calcination Temperature ◽

Cerium Oxide ◽

Absorption Spectroscopy ◽

Hafnium Oxide ◽

Intermediate Level ◽

X Ray Diffraction ◽

X Ray ◽

X Ray Absorption ◽

Additional Phase

AbstractThe choice of surrogate for plutonium oxide for use during the initial stages of research into the immobilization of intermediate level pyrochemical wastes containing plutonium andamericium oxides in a calcium phosphate host has been investigated by powder X-ray diffraction and X-ray absorption spectroscopy. Two non-radioactive surrogates, hafnium oxide and cerium oxide, together with radioactive thorium oxide were compared. Similarities in behaviour were observed for all three surrogates when calcined at the lowest temperature, 750°C but differences became more pronounced as the calcination temperature was increased to 950°C. Although some reaction occurred between all the surrogates and the host to form a substituted whitlockite phase, increasing the temperature led to a significant increase in the cerium reaction and the formation of an additional phase, monazite. Additionally it was observed that the cerium became increasingly trivalent at higher temperatures.

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Investigation into the Palladium-Europium Acetate Reductive Decomposition with Synchrotron Radiation-Based X-ray Diffraction and X-ray Absorption Spectroscopy

Zeitschrift für anorganische und allgemeine Chemie ◽

10.1002/zaac.201400258 ◽

2014 ◽

Vol 640 (12-13) ◽

pp. 2577-2582 ◽

Cited By ~ 1

Author(s):

Evgeny Khramov ◽

Olga Belyakova ◽

Vadim Murzin ◽

Alexey Veligzhanin ◽

Alfred Chernyshov ◽

...

Keyword(s):

Synchrotron Radiation ◽

Absorption Spectroscopy ◽

X Ray Diffraction ◽

X Ray ◽

Reductive Decomposition ◽

X Ray Absorption

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LiMn2-xCuxO4 Spineis - 5 V Cathode Materials

MRS Proceedings ◽

10.1557/proc-496-315 ◽

1997 ◽

Vol 496 ◽

Author(s):

Yair Ein-Eli ◽

W. F. Howard ◽

Sharon H. Lu ◽

Sanjeev Mukerjee ◽

James McBreen ◽

...

Keyword(s):

Copper Ions ◽

Oxide Phase ◽

Electrochemical Process ◽

X Ray Diffraction ◽

X Ray ◽

Spinel Compounds ◽

Composition And Structure ◽

Phase Spinel ◽

Lithium Copper Oxide ◽

X Ray Absorption

ABSTRACTA series of electroactive spinel compounds, LiMn2-xCuxO4 (0.1 ≤ x ≤ 0.5) has been studied by crystallographic, spectroscopie and electrochemical methods and by electron-microscopy. These LiMn2-xCuxO4 spinels are nearly identical in structure to cubic LiMn2O4 and successfully undergo reversible Li intercalation. The electrochemical data show slight shifts to higher voltage for the delithiation reaction that normally occurs at 4.1 V in standard Li1−xMn2O4 electrodes (1 ≥ x ≥ 0) corresponding to the oxidation of Mn3+ to Mn4+. The data also show a remarkable reversible electrochemical process at 4.9 V which is attributed to the oxidation of Cu2+ to Cu3+. The inclusion of Cu in the spinel structure enhances the electrochemical stability of these materials upon cycling. The initial capacity of LiMn2-xCuxO4 spinels decreases with increasing x from 130 mAh/g in LiMn2O4 (x=0) to 70 mAh/g in “LiMn1.5Cu0.5O4”(x=0.5). Although the powder X-ray diffraction pattern of “LiMn1.5Cu0.5 O4” shows a single-phase spinel product, neutron diffraction data show a small, but significant quantity of an impurity phase, the composition and structure of which could not be identified. X-ray absorption spectroscopy was used to gather information about the oxidation states of the manganese and copper ions. The composition of the spinel component in the LiMn1.5Cu0.5O4 was determined from X-ray diffraction and XANES data to be Li1.01Mn1.67Cu0.32O4 suggesting, to a best approximation, that the impurity in the sample was a lithium-copper-oxide phase.

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Mechanism of pressure induced amorphization of SnI4: A combined x-ray diffraction—x-ray absorption spectroscopy study

The Journal of Chemical Physics ◽

10.1063/5.0012802 ◽

2020 ◽

Vol 153 (6) ◽

pp. 064501

Author(s):

Emiliano Fonda ◽

Alain Polian ◽

Toru Shinmei ◽

Tetsuo Irifune ◽

Jean-Paul Itié

Keyword(s):

Absorption Spectroscopy ◽

Spectroscopy Study ◽

X Ray Diffraction ◽

X Ray ◽

X Ray Absorption

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Chromium Environment within Cr-Doped BaAl2O4: Correlation of X-ray Diffraction and X-ray Absorption Spectroscopy Investigations

Inorganic Chemistry ◽

10.1021/acs.inorgchem.5b01379 ◽

2015 ◽

Vol 54 (23) ◽

pp. 11127-11135 ◽

Cited By ~ 9

Author(s):

Martina Vrankić ◽

Biserka Gržeta ◽

Dirk Lützenkirchen-Hecht ◽

Sanja Bosnar ◽

Ankica Šarić

Keyword(s):

Absorption Spectroscopy ◽

X Ray Diffraction ◽

X Ray ◽

X Ray Absorption

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Environment of the Eu3+ Ion within Nanocrystalline Eu-Doped BaAl2O4: Correlation of X-ray Diffraction, Mössbauer Spectroscopy, X-ray Absorption Spectroscopy, and Photoluminescence Investigations

Inorganic Chemistry ◽

10.1021/acs.inorgchem.7b02322 ◽

2018 ◽

Vol 57 (4) ◽

pp. 1744-1756 ◽

Cited By ~ 7

Author(s):

Biserka Gržeta ◽

Dirk Lützenkirchen-Hecht ◽

Martina Vrankić ◽

Sanja Bosnar ◽

Ankica Šarić ◽

...

Keyword(s):

Mössbauer Spectroscopy ◽

Absorption Spectroscopy ◽

Mossbauer Spectroscopy ◽

X Ray Diffraction ◽

X Ray ◽

Mößbauer Spectroscopy ◽

X Ray Absorption

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Structural dynamics of an iron molybdate catalyst under redox cycling conditions studied with in situ multi edge XAS and XRD

Physical Chemistry Chemical Physics ◽

10.1039/d0cp01506g ◽

2020 ◽

Vol 22 (20) ◽

pp. 11713-11723 ◽

Cited By ~ 1

Author(s):

Abhijeet Gaur ◽

Matthias Stehle ◽

Kristian Viegaard Raun ◽

Joachim Thrane ◽

Anker Degn Jensen ◽

...

Keyword(s):

Phase Transformations ◽

Absorption Spectroscopy ◽

Structural Dynamics ◽

Redox Cycling ◽

X Ray Diffraction ◽

Iron Molybdate ◽

X Ray ◽

X Ray Absorption

Combination of in situ multi-edge X-ray absorption spectroscopy at the Mo K- and Fe K-edges in combination with X-ray diffraction successfully uncovered structural dynamics and phase transformations of an iron molybdate catalyst during redox cycling.

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