Takeshi Okura
Hokkaido University
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Publication
Featured researches published by Takeshi Okura.
Geochimica et Cosmochimica Acta | 1957
Go Okamoto; Takeshi Okura; Katsumi Goto
Abstract In view of the discordant theories for the mechanism of sedimentation of silica in natural waters, chemical properties of silica have been studied further. The solubility of amorphous silica has been measured over a wide range of pH and temperature. The study on the depolymerization of colloidal silica indicated that sea-water is not saturated with respect to molecularly dispersed silica. The presence of a small amount of aluminium greatly influences the state of silica in water. Thus colloidal silica can be precipitated even by a trace amount of aluminium, while a larger amount of the latter is required for the precipitation of molecularly dispersed silica. The optimum pH for the precipitation of colloidal silica is about 4·5 in contrast to that of about 8 for molecularly dispersed silica.
Analytical Chemistry | 1962
Takeshi Okura; Katsumi Goto; Takao Yotuyanagi
Bulletin of the Chemical Society of Japan | 1958
Katsumi Goto; Hiroshi Ochi; Takeshi Okura
Bulletin of Volcanology | 1963
Isao Kayama; Masayo Murozumi; Takeshi Okura; Yasumitsu Uzumasa; Joyo Ossaka
Nippon Kagaku Kaishi | 1959
Takeshi Okura; Hidetomo Suzuki; Katsuya Sano
Bulletin of the Chemical Society of Japan | 1958
Takeshi Okura; Katsumi Goto; Tsuyoshi Komatsu
Bulletin of the Chemical Society of Japan | 1950
Yasumitsu Uzumasa; Takeshi Okura
Nippon Kagaku Kaishi | 1955
Takeshi Okura; Katsumi Goto
Nippon Kagaku Kaishi | 1959
Go Okamoto; Takeshi Okura; Tsuyoshi Komatsu
Nippon Kagaku Kaishi | 1963
Takeshi Okura; Hiroto Watanabe
