X‑ray Accelerated Photo-Oxidation of As(III) in Solution

We performed near edge X-ray absorption spectroscopy (XANES) measurements on the arsenic K-edge of As(III) in solution under acidic and basic conditions, after exposure of the solutions to air. Spectra were recorded for increasing exposure times to the X-rays used to perform absorption spectroscopy...

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Bibliographic Details
Published in:The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Molecules, spectroscopy, kinetics, environment, & general theory, 2015-03, Vol.119 (12), p.2829-2833
Main Authors: Canche-Tello, Jesus, Vargas, M. Cristina, Hérnandez-Cobos, Jorge, Ortega-Blake, Iván, Leclercq, Amelie, Solari, Pierre Lorenzo, Lezama-Pacheco, Juan, Den Auwer, Christophe, Mustre de Leon, José
Format: Article
Language:English
Subjects:
Absorption spectroscopy
Arsenites - chemistry
Conversion
Exposure
Oxidation-Reduction - radiation effects
Photochemical Processes
Physical chemistry
Solutions
Spectra
Spectroscopy
X-Ray Absorption Spectroscopy
X-Rays
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Summary:We performed near edge X-ray absorption spectroscopy (XANES) measurements on the arsenic K-edge of As(III) in solution under acidic and basic conditions, after exposure of the solutions to air. Spectra were recorded for increasing exposure times to the X-rays used to perform absorption spectroscopy measurements. We did not find changes for the solution under acidic conditions, whereas we observed significant changes in the case of solution under alkaline conditions. To interpret these changes, we compared the obtained spectra with XANES spectra of As(III) and As(V) solutions under alkaline conditions, not exposed to air, and used as standards. Principal component fits using these standards indicate an accelerated conversion of As(III) to As(V) due to the exposure to X-rays.
ISSN:1089-5639
1520-5215
DOI:10.1021/jp510596p