JDR Vol.14 No.5 pp. 780-785
doi: 10.20965/jdr.2019.p0780


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

Takahiro Miwa

National Research Institute for Earth Science and Disaster Resilience (NIED)
3-1 Tennodai, Tsukuba, Ibaraki 305-0006, Japan

February 26, 2019
June 11, 2019
August 1, 2019
UV–Vis–NIR dispersive microspectroscopy, rhyolite glass, speciation, H2O molecule, OH- group

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.

Cite this article as:
Takahiro Miwa, “Measurement of H2O Molecule and Hydroxyl Concentrations in Hydrous Rhyolitic Glass by UV–Vis–NIR Dispersive Microspectroscopy,” J. Disaster Res., Vol.14, No.5, pp. 780-785, 2019.
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