論文

査読有り
2019年8月1日

Measurement of H2O Molecule and Hydroxyl Concentrations in Hydrous Rhyolitic Glass by UV–Vis–NIR Dispersive Microspectroscopy

Journal of Disaster Research
  • Takahiro Miwa

14
5
開始ページ
780
終了ページ
785
記述言語
掲載種別
研究論文(学術雑誌)
DOI
10.20965/jdr.2019.p0780
出版者・発行元
Fuji Technology Press Ltd.

The speciation of water in volcanic glass, as indicated by the relative proportions of H2O and OH-, provides information on the processes of volcanic eruptions. Earlier studies of water species used ultraviolet–visible–near-infrared (UV–Vis–NIR) dispersive spectroscopy to examine the NIR spectra of volcanic glass but were unable to confirm whether areas as small as 100 μm across could be studied. Here, UV–Vis–NIR dispersive microspectroscopy was applied in a study of hydrous rhyolitic glass synthesized by decompression in a cold-seal pressure vessel at 880°C. The concentrations of water species were determined by transmittance spectroscopy, with results consistent with those of Fourier-transform infrared microspectroscopy. The measured total water contents were consistent with the known solubility of water in rhyolitic magma, and, therefore, it is concluded that UV–Vis–NIR microspectroscopy can be applied in determining the concentrations of H2O and OH- in hydrous rhyolitic glass.

リンク情報
DOI
https://doi.org/10.20965/jdr.2019.p0780
URL
https://www.fujipress.jp/main/wp-content/themes/Fujipress/phyosetsu.php?ppno=DSSTR001400050008

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