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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Stable hydrogen and oxygen isotopic compositions of water vapor in volcanic plumes sampled in glass bottles using cavity ring-down spectroscopy
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Stable hydrogen and oxygen isotopic compositions of water vapor in volcanic plumes sampled in glass bottles using cavity ring-down spectroscopy

机译：使用腔衰荡光谱技术在玻璃瓶中采样的火山羽中水蒸气中稳定的氢和氧同位素组成

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The isotopic compositions (delta H-2 and delta O-18) of fumarolic H2O emitted during volcanic eruptions can distinguish the type of eruption (magmatic or phreatic), but direct sampling of fumarolic H2O in eruptive volcanoes is often neither practical nor safe. In this study, we developed a new analytical system to safely determine the isotopic compositions of fumarolic H2O from the volcanic plume samples taken in glass bottles. The system consisted of stainless steel gas introduction line and a cavity ring-down spectroscopic unit. In the 1 L glass sample bottles, analytical precision (1 sigma) was estimated to be better than 2%0 and 0.3%., respectively, when >3400 ppmv of H2O was introduced, and better than 3%0 (delta H-2) and 0.4%0 (delta O-18) when >1800 ppmv of H2O was introduced. The H2O concentration accuracy was better than 5%. Using this in-situ collection method and the analytical system, we determined the isotopic compositions of H2O in volcanic plume samples taken at Iwo-yama in the Kirishima volcano group (Japan), and deduced the isotopic composition of fumarolic H2O from the volcanic plume. The reciprocal of the H2O concentration in the plume samples showed a good linear relationship with the isotopic composition. The isotopic composition of fumarolic H2O from Iwo-yama estimated from the plume samples directly corresponded to the determined fumarolic H2O. This method improves upon previous analyses to obtain the isotopic compositions of fumarolic H2O, particularly by reducing tedious, time consuming, and dangerous sampling of water vapor at volcanic fumaroles. (C) 2019 The Authors. Published by Elsevier B.V.
机译：火山喷发过程中喷出的富马酸H2O的同位素组成（δH-2和δO-18）可以区分喷发的类型（岩浆或潜水），但是在喷发火山中直接采样富马酸H2O通常既不实用也不安全。在这项研究中，我们开发了一种新的分析系统，可以从玻璃瓶中采集的火山羽流样品中安全测定富马酸H2O的同位素组成。该系统由不锈钢气体引入线和腔衰荡光谱仪组成。在1 L玻璃样品瓶中，当引入大于3400 ppmv的H2O时，分析精度（1 sigma）估计分别优于2％0和0.3％，并且优于3％0（δH-2）当引入> 1800 ppmv的H2O时）和0.4％0（δO-18）。 H2O浓度精度优于5％。使用这种原位收集方法和分析系统，我们确定了雾岛山（日本）岩城山采集的火山羽样品中H2O的同位素组成，并从火山羽中推导出了富马酸H2O的同位素组成。羽状样品中H2O浓度的倒数与同位素组成显示出良好的线性关系。从羽状样品估算的硫磺山中的富马酚H2O同位素组成直接对应于确定的富马酚H2O。该方法对以前的分析进行了改进，以获取富马酚水的同位素组成，特别是通过减少了繁琐，耗时且危险的富马酚水蒸气采样来进行分析。 （C）2019作者。由Elsevier B.V.发布

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