ANALYTICAL TECHNIQUES FOR DETERMINING A MICRO QUANTITY OF CO_2 IN VOLCANIC GLASS BY LASER PROBE MASS SPECTROMETRY
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概要
- 論文の詳細を見る
An analytical system has been developed for determining a micro quantity (0.1-1ng) of CO_2 in volcanic glass. It consists of a Nd-YAG laser for the selective heating of small areas of volcanic glass and a gas chromatogragh-mass spectrometer for measuirng the absolute amount of the CO_2 extracted from the glass. The carbon dioxide concentrations of the glass samples were calculated from the mass of the melted glass and the measured amount of CO_2. The glass sample ground to a thickness of less than 100 μm was pierced by a laser beam. The volume of the melted glass was controlled by changing the duration of the laser beam. The mass of the melted gldss was calculated from its volume and density. Analysis of homogenized basaltic glass with a bulk CO_2 concentration of 326 ppm gave a CO_2 concentration of 270±70 ppm when the extracted CO_2 was more than 0.6 ng. Glass inclusions larger than 100 μm in diameter can be analyzed by the present method with an accuracy of ±70 ppm when the CO_2 concentration is 300 ppm.
- 日本自然災害学会の論文
著者
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Kusakabe Minoru
Institute For Study Of The Earth's Interior Okayama University
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Saito Genji
Institute For Study Of The Earth's Interior Okayama University
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Kusakabe Minoru
Institute For Study Of The Earth Interior Okayama University
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