Quantification of Water Content and Speciation in Synthetic Rhyolitic Glasses: Optimising the Analytical Method of Confocal Raman Spectrometry

IF 2.7 2区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Geostandards and Geoanalytical Research Pub Date : 2023-03-05 DOI:10.1111/ggr.12490
Cong Tu, Zi-Yue Meng, Xiao-Ying Gao, Li Zhang
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Abstract

Quantification of water content in silicate glasses is of vital significance in understanding magma evolution and metamorphic anataxis. Here we provide a method for the determination of total dissolved water content and water speciation in silicate melts by confocal laser Raman spectrometry based on a set of hydrous rhyolitic glasses. A series of alumino-silicate glasses with water contents from 0.33 to 9.05% m/m were synthesised in a piston cylinder apparatus. Synchrotron-FTIR mapping shows that these glasses have relatively homogeneous distributions of dissolved water. Total water contents of the glasses were precisely measured by TC/EA-MS and FTIR. Both external and internal calibration were established for the quantitative analysis of water content and water speciation in the silicate glasses based on excellent linear correlation between total dissolved water content and integrated area of the water Raman band. Furthermore, by decomposing the total water Raman bands into four Gaussians components, the relative concentration of water speciation (OH groups and molecules H2Om) dissolved in the glasses was determined with a similar trend to water speciation data derived from FTIR. We suggest that the relative concentration of water speciation can be estimated in rhyolitic glasses with 4–8% m/m H2O. Our work provides an accurate method to determine total water content and a potential tool to limit the relative concentration of water speciation dissolved in silicic glasses.

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合成Rhyolitic玻璃中水含量和形态的定量:共焦拉曼光谱分析方法的优化
硅酸盐玻璃中含水量的定量对于理解岩浆演化和变质锐钛矿具有重要意义。在这里,我们提供了一种基于一套含水流纹岩玻璃的共聚焦激光拉曼光谱法测定硅酸盐熔体中总溶解水含量和水形态的方法。在活塞筒装置中合成了一系列含水量为0.33~9.05%m/m的铝硅酸盐玻璃。同步FTIR图谱显示这些玻璃具有相对均匀的溶解水分布。通过TC/EA-MS和FTIR对玻璃的总含水量进行了精确测定。基于总溶解水含量与水拉曼光谱积分面积之间的良好线性相关性,建立了用于硅酸盐玻璃中水含量和水形态定量分析的外部和内部校准。此外,通过将总的水拉曼光谱分解为四种高斯组分,确定了溶解在玻璃中的水形态(OH基团和分子H2Om)的相对浓度,其趋势与FTIR得出的水形态数据相似。我们建议,在含有4–8%m/m H2O的流纹岩玻璃中,可以估计水形态的相对浓度。我们的工作提供了一种准确的方法来确定总含水量,并为限制溶解在硅酸玻璃中的水形态的相对浓度提供了一个潜在的工具。
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来源期刊
Geostandards and Geoanalytical Research
Geostandards and Geoanalytical Research 地学-地球科学综合
CiteScore
7.10
自引率
18.40%
发文量
54
审稿时长
>12 weeks
期刊介绍: Geostandards & Geoanalytical Research is an international journal dedicated to advancing the science of reference materials, analytical techniques and data quality relevant to the chemical analysis of geological and environmental samples. Papers are accepted for publication following peer review.
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