Estimation of Water Concentration in Volcanic Glass Using Energy Dispersal X-ray Spectrometry

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  • GESHI Nobuo
    Institute of Earthquake and Volcano Geology, Geological Survey of Japan
  • MIYAGI Isoji
    Institute of Earthquake and Volcano Geology, Geological Survey of Japan
  • SAITO Genji
    Institute of Earthquake and Volcano Geology, Geological Survey of Japan

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  • エネルギー分散型エックス線分析装置による火山ガラス含水量の簡易定量法
  • エネルギー ブンサンガタ エックスセン ブンセキ ソウチ ニ ヨル カザン ガラス ガン スイリョウ ノ カンイ テイリョウホウ

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Abstract

<p>We propose a simplified method for the estimation of water content in volcanic glass using the quantitative analysis of oxygen concentration with an energy dispersive X-ray spectrometry (EDS). The difference between the bulk concentration of oxygen measured by EDS and the stoichiometric amount of oxygen to form all the elements in the sample oxide is assumed as the oxygen which consists of water. For precise quantitation of oxygen, the evaluation of the thickness of carbon coating film on the sample is crucial. The thickness of carbon coating on the sample was estimated using the stoichiometric ratio among the elements in the standard mineral put in the next of the unknown samples. The results of this methods show good correlation to the measurement using FT-IRand SIMS methods.</p>

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