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A study on the interaction between ferric ion and silicic acid in hydrosphere: Si-containing ferruginous deposits formed in neutral hot spring waters

引用

Chinese Journal Of Geochemistry 2013年第1期32卷 27-34页

作者： Gaowa Naren Akane Miyazaki Motoyuki Matsuo BAI Shuqin kotaro yonesu Yoshihiro Okaue Takushi Yokoyama Department of Chemistry Faculty of Science Kyushu University Department of Chemical and Biological Sciences Faculty of Science Japan Women's University Department of Chemistry Graduate School of Arts and Sciences University of Tokyo College of Environment and Resources Inner Mongolia University Department of Earth Resources Engineering Faculty of Engineering Kyushu University

Five ferruginous deposit samples formed from neutral hot springs were analyzed to determine whether they consisted of a mixture of silica, hydrous iron oxide or iron silicate by differential thermal analysis (DTA), infrared (IR) spectroscopy, powder X-ray diffraction (XRD), and 57Fe Mssbauer spectroscopy. The Si/Fe atomic ratios of the deposits ranged from 0.25 to 0.45, and were smaller than those of hisingerite (12), but apparently close to those of siliceous ferrihydrite (0.250.5). Si was confirmed to be present as monomeric or oligomeric silicate from the Si-O stretching vibration frequencies on the IR spectra. Judging from the results of DTA, which minerals starting to produce after heating, and a relationship between Si-O stretching vibration frequency and Si/Fe atomic ratio proposed by Henmi et al. (1981), all the deposits in this study were concluded to be mixtures of various siliceous ferri-hydrites with low and high Si/Fe atomic ratios. Moreover, by comparing the chemical properties of hot spring waters, the formation conditions of siliceous ferrihydrite were also discussed.

关键词：温泉水硅酸盐三价铁离子 Si 相互作用中性铁质伸缩振动频率

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