Spectrophotometric Study on the Determination of Germanium
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概要
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Phenylfluorone forms a hardly soluble colored complex with germanium. On dispersing the complex with gum arabic, Cluley used it in the photometric determination of germanium. Dispersed particles of precipitate, however, aggregated and settled down in a short time. Consequently, absorbancy readings changed, that is, they decreased in the shorter wavelength range and increased in the longer wavelength range with the lapse of time. The change was remarkable especially when the germanium content was as high as about 1 γ/ml. Therefore, reliable results could hardly be obtained. When the precipitates were dispersed with polyvinylalcohol, phenylfluorone produced a clear orange-red solution with germanium. It could not be distinguished from the true solution with the naked eye even after it was allowed to rest for several days. In this case, the definite absorbancy readings were taken for 3 hours at 500 and 505 mμ. Absorbancy readings slightly increased at above 510 mμ, but the change was negligible within 1 hour after the development of color. Calibration curves, therefore, showed far better linearity than those obtained by dispersing the precipitate with gum arabic.
著者
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OKA Yoshinaga
The Research Institute of Mineral Dressing and Metallurgy
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Kanno Takuji
The Research Institute Of Mineral Dressing And Metallergy
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