Rayleigh scattering by aqueous colloidal silica as a cause for the blue color of hydrothermal water

Chan, 1989, A review on solubility and polymerization of silica, Geothermics, 18, 49, 10.1016/0375-6505(89)90009-6 Ellis, A.J., Mahon, W.A.J., 1977. Mineral deposition. In: Chemistry and Geothermal Systems. Academic Press, New York, pp. 296–310. Hangai, A., 1999. Study on Blue Coloration of the Umi-jigoku Hot Pool, Beppu Geothermal Field, Japan. Bachelor’s thesis, Faculty of Science, Toho University (in Japanese). Hosoi, 1982, Study on precipitation and prevention of the silica scale from the geothermal hot water (in Japanese with English abstract), J. Geotherm. Res. Soc. Jpn., 4, 127 Ichikuni, 1968, Chemistry of silicious deposits formed from hot spring waters (in Japanese with English abstract), J. Soc. Eng. Mineral Springs Jpn., 5, 48 Iler, R.K., 1979. The Chemistry of Silica. Wiley-Interscience publication, Wiley, New York. Kitahara, F., Furusawa, K., 1979. Silica colloid. In: Chemistry of Dispersion and Emulsion Systems. Kogaku-Tosho, Tokyo, p. 27 (in Japanese). LaMer, 1946, Monodispersed hydrophobic colloidal dispersions and light scattering properties. I. Preparation and light scattering properties of monodispersed colloidal sulfur, J. Colloid Sci., 1, 71, 10.1016/0095-8522(46)90007-4 Nagao, 1989, Study of colors and degrees of weathering of granitic rocks by visible diffuse reflectance spectroscopy, Geochem. J., 23, 75, 10.2343/geochemj.23.75 Nagao, 1991, A convenient method of color measurement of marine sediments by colorimeter, Geochem. J., 25, 187, 10.2343/geochemj.25.187 Nicholson, K., 1993. Geothermal Fluids: Chemistry and Exploration Techniques. Springer, Berlin. Ohsawa, S., 1992. Geochemical Studies on the Behavior of intermediately oxidized Sulfur Compounds in Aqueous Solution. Applications to Volcanology. Ph.D dissertation. Department of Chemistry, University of Tokyo (in Japanese). Ohsawa, 1997, Preliminary study on the blue color of hydrothermal water (in Japanese), Rep. Oita Prefect. Hot Spring Res. Soc., 48, 41 Shimono, 1983, Study of polymerization of silicic acid in aqueous solution by trimethylsilylation-gas chromatography, J. Chromatogr., 258, 73, 10.1016/S0021-9673(00)96399-4 Tarutani, 1956, Study on behavior of silicic acid in water. II. Formation of colloidal silica and its equilibrated concentration (in Japanese), Bull. Chem. Soc. Jpn. (Nihon Kagaku Zatsushi), 77, 1721 Yokoyama, 1983, Storage of geothermal water samples for determination of silicic acid (in Japanese with English abstract), Chinetus (J. Jpn. Geotherm. Energy Assoc.), 20, 316