scholarly journals Strategies for the analysis of the elemental metal fraction of Ir and Ru oxides via XRD, XANES, and EXAFS

2019 ◽  
Vol 21 (23) ◽  
pp. 12217-12230 ◽  
Author(s):  
Anita Hamar Reksten ◽  
Andrea E. Russell ◽  
Peter W. Richardson ◽  
Stephen J. Thompson ◽  
Karina Mathisen ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
X Ray ◽  
Metal Fraction ◽  
Oxide Phases ◽  
X Ray Absorption

X-ray absorption spectroscopy reveals separately the structures of metal and oxide phases of iridium and ruthenium electrocatalysts containing both.

scholarly journals 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

2019 ◽  
Vol 36 (2) ◽  
pp. 229-241 ◽  
Author(s):  
Ingrid Nayeli Escobar-Quiroz ◽  
Mario Villalobos-Peñalosa ◽  
Teresa Pi-Puig ◽  
Francisco Martín Romero ◽  
Javier Aguilar-Carrillo de Albornoz
Keyword(s):  
Absorption Spectroscopy ◽  
Copper Ions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Selective Sequential Extraction ◽  
Metallurgical Wastes ◽  
Solid Iron ◽  
Oxide Phases ◽  
Mine Acid ◽  
X Ray Absorption

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.

scholarly journals Insight into pH-Dependent Formation of Manganese Oxide Phases in Electrodeposited Catalytic Films Probed by Soft X-Ray Absorption Spectroscopy

ChemPlusChem ◽  
2018 ◽  
Vol 83 (7) ◽  
pp. 721-727 ◽  
Author(s):  
Maryam N. Shaker ◽  
Shannon A. Bonke ◽  
Jie Xiao ◽  
Munirah A. Khan ◽  
Rosalie K. Hocking ◽  
...  
Keyword(s):  
Manganese Oxide ◽  
Absorption Spectroscopy ◽  
X Ray ◽  
Oxide Phases ◽  
Ph Dependent ◽  
X Ray Absorption ◽  
Insight Into

X-RAY ABSORPTION SPECTROSCOPY STUDY OF Cu-BASED METHANOL CATALYSTS. 2. REDUCED STATE

1986 ◽  
Vol 47 (C8) ◽  
pp. C8-237-C8-242 ◽  
Author(s):  
B. S. CLAUSEN ◽  
B. LENGELER ◽  
B. S. RASMUSSEN ◽  
W. NIEMANN ◽  
H. TOPSØE
Keyword(s):  
Absorption Spectroscopy ◽  
Spectroscopy Study ◽  
X Ray ◽  
X Ray Absorption ◽  
Reduced State

GAS PHASE X-RAY ABSORPTION SPECTROSCOPY WITH AN ELECTRON YIELD DETECTOR

1986 ◽  
Vol 47 (C8) ◽  
pp. C8-149-C8-151
Author(s):  
F. W. LYTLE ◽  
R. B. GREEGOR ◽  
G. H. VIA ◽  
J. M. BROWN ◽  
G. MEITZNER
Keyword(s):  
Gas Phase ◽  
Absorption Spectroscopy ◽  
X Ray ◽  
Electron Yield ◽  
X Ray Absorption

THE FORMATION, STRUCTURE AND DISSOLUTION OF THE FERRITIN IRON CORE STUDIED BY X-RAY ABSORPTION SPECTROSCOPY

1986 ◽  
Vol 47 (C8) ◽  
pp. C8-1155-C8-1157
Author(s):  
E. C. THEIL ◽  
D. E. SAYERS ◽  
C. Y. YANG ◽  
A. FONTAINE ◽  
E. DARTYGE
Keyword(s):  
Absorption Spectroscopy ◽  
Iron Core ◽  
X Ray ◽  
Ferritin Iron ◽  
X Ray Absorption

STOPPED-FLOW X-RAY ABSORPTION SPECTROSCOPY IN DISPERSIVE MODE

1986 ◽  
Vol 47 (C8) ◽  
pp. C8-555-C8-561 ◽  
Author(s):  
S. SAIGO ◽  
H. OYANAGI ◽  
T. MATSUSHITA ◽  
H. HASHIMOTO ◽  
N. YOSHIDA ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Stopped Flow ◽  
X Ray ◽  
X Ray Absorption
Sign in / Sign up

Export Citation Format

Share Document