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231225s2018 xx |||||o 00| ||eng c |
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|a 10.1107/S1600577518002576
|2 doi
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|a pubmed25n0945.xml
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|e rakwb
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|a eng
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|a Han, Young Soo
|e verfasserin
|4 aut
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|a Beam-induced redox transformation of arsenic during As K-edge XAS measurements
|b availability of reducing or oxidizing agents and As speciation
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|c 2018
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Revised 20.11.2019
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a During X-ray absorption spectroscopy (XAS) measurements of arsenic (As), beam-induced redox transformation is often observed. In this study, the As species immobilized by poorly crystallized mackinawite (FeS) was assessed for the susceptibility to beam-induced redox reactions as a function of sample properties including the redox state of FeS and the solid-phase As speciation. The beam-induced oxidation of reduced As species was found to be mediated by the atmospheric O2 and the oxidation products of FeS [e.g. Fe(III) (oxyhydr)oxides and intermediate sulfurs]. Regardless of the redox state of FeS, both arsenic sulfide and surface-complexed As(III) readily underwent the photo-oxidation upon exposure to the atmospheric O2 during XAS measurements. With strict O2 exclusion, however, both As(0) and arsenic sulfide were less prone to the photo-oxidation by Fe(III) (oxyhydr)oxides than NaAsO2 and/or surface-complexed As(III). In case of unaerated As(V)-reacted FeS samples, surface-complexed As(V) was photocatalytically reduced during XAS measurements, but arsenic sulfide did not undergo the photo-reduction
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|a Journal Article
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|a X-ray absorption spectroscopy
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|a arsenic
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|a linear combination fitting
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|a mackinawite
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|a photocatalytic transformation
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|a Jeong, Hoon Young
|e verfasserin
|4 aut
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|a Hyun, Sung Pil
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Hayes, Kim F
|e verfasserin
|4 aut
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| 700 |
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|a Chon, Chul Min
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Journal of synchrotron radiation
|d 1994
|g 25(2018), Pt 3 vom: 01. Mai, Seite 763-770
|w (DE-627)NLM09824129X
|x 1600-5775
|7 nnns
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| 773 |
1 |
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|g volume:25
|g year:2018
|g number:Pt 3
|g day:01
|g month:05
|g pages:763-770
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|u http://dx.doi.org/10.1107/S1600577518002576
|3 Volltext
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|h 763-770
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