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Abstract
S K-edge XANES, lambda (SK alpha) wavelength shift, S-33 MAS NMR and Raman spectroscopy have been applied to a series of experimentally synthesised hydrous sulphur bearing silicate glasses to determine the oxidation state of sulphur dissolved in the glass. Glasses investigated include soda-lime glass (SLG), K2Si4O9 (KSG) and albitic (Albite) and trondhjemitic (TROND) glass compositions. The four spectroscopic techniques are compared with each other to investigate the applicability of each technique as a method to determine the sulphur oxidation state and structural aspects of sulphur dissolution in silicate melts.
XANES and Raman spectroscopy provide the most comprehensive information on the S-speciation and S6+ and S2- (plus S4+ in the case of XANES) can be detected. XANES allows detection of S-species at lower concentrations (
The linear combination of XANES spectra of glasses containing either only S2- or S6+ provides direct constraints on the S6+/Sigma S of glasses containing a mixture of S2- and S6+. In addition the Raman intensities of bands related to S6+ and S2- can also be used to quantify S6+/Sigma S and determined values are in good agreement with those obtained by XANES at least for S contents of >150 ppm. XANES and Raman both show that the dissolution of S2- is different in Fe-free and Fe-bearing hydrous glasses. In Fe-free glasses S2- is present as SH- and H2S whereas Fe-S complexes are observed in the presence of Fe. (C) 2012 Elsevier B.V. All rights reserved.
Original language | English |
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Pages (from-to) | 237-249 |
Number of pages | 13 |
Journal | Chemical Geology |
Volume | 322 |
DOIs | |
Publication status | Published - 5 Sept 2012 |
Keywords
- X-RAY-ABSORPTION
- VIBRATIONAL SPECTROSCOPY
- S K-edge XANES
- FLUID INCLUSIONS
- WAVELENGTH SHIFTS
- OXIDATION-STATE
- lambda (SK alpha) wavelength shift
- Raman spectroscopy
- Sulphur oxidation state
- S-33 MAS NMR
- RAMAN-SPECTROSCOPY
- BOROSILICATE WASTE GLASSES
- INDIVIDUAL PHASES
- Silicate glass
- XANES SPECTROSCOPY
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Dive into the research topics of 'The dissolution mechanism of sulphur in hydrous silicate melts. I: Assessment of analytical techniques in determining the sulphur speciation in iron-free to iron-poor glasses'. Together they form a unique fingerprint.Projects
- 1 Finished
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SULPHUR DEGASSING FROM VOLACANOES
Kohn, S. C. (Principal Investigator)
1/06/05 → 1/10/08
Project: Research