A study on the interaction between ferric ion and silicic acid in hydrosphere: Si-containing ferruginous deposits formed in neutral hot spring waters
作者： Gaowa Naren , Akane Miyazaki , Motoyuki Matsuo , Shuqin Bai , Kotaro Yonesu
DOI: 10.1007/S11631-013-0603-9
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摘要: Five ferruginous deposit samples formed from neutral hot springs were analyzed to determine whether they consisted of a mixture silica, hydrous iron oxide or silicate by differential thermal analysis (DTA), infrared (IR) spectroscopy, powder X-ray diffraction (XRD), and 57Fe Mossbauer spectroscopy. The Si/Fe atomic ratios the deposits ranged 0.25 0.45, smaller than those hisingerite (1–2), but apparently close siliceous ferrihydrite (0.25–0.5). Si was confirmed be present as monomeric oligomeric Si-O stretching vibration frequencies on IR spectra. Judging results DTA, which minerals starting produce after heating, relationship between frequency ratio proposed Henmi et al. (1981), all in this study concluded mixtures various ferrihydrites with low high ratios. Moreover, comparing chemical properties spring waters, formation conditions also discussed.
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