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