Infrared spectroscopic analysis of β-ferric oxyhydroxide:Studies of state analysis with instrumental method. II
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Fundamental studies were taken for β-ferric oxyhydroxide (β-FeOOH) in rust formed on steel in sea water by an infrared spectrometric method. The results obtained are as follows;<BR>(1) The β-FeOOH synthesized is a spindle shaped crystal with 300 mμ long and 60 mμ width, but no difference are in particle size and crystallization by ageing of its crystal. These are the characteristic properties for β-FeOOH, which differ from the ones of α- and γ-FeOOH.<BR>(2) β-FeOOH has fairly broad absorption bands at 835 cm<SUP>-1</SUP> and 690 cm<SUP>-1</SUP> in its infrared absorption spectrum. The 835 cm<SUP>-1</SUP> band is effective one as socalled key band and the absorbance is worked out with a base line method. If only β-FeOOH is present, a linear calibration curve is obtained between its weight and absorbance.<BR>(3) When β-FeOOH coexists with α-FeOOH, a calibration curve can be drawn up from the ratio of the absorbance at 835cm<SUP>-1</SUP> band for β-FeOOH with the average absorbance between at 890 cm<SUP>-1</SUP> and 797 cm<SUP>-1</SUP> bands for α-FeOOH. In the presence of γ-FeOOH, the calibration curve for β-FeOOH is obtained directly from the absorbance at 835cm<SUP>-1</SUP>, or from the ratio of the average absorbance between 1026 cm<SUP>-1</SUP> and 735 cm<SUP>-1</SUP> bands for γ-FeOOH with the absorbance at 835 cm<SUP>-1</SUP> band for β-FeOOH.<BR>(4) In the practical samples of rust from steel in sea water, the reproducibility with the average absorbance method is superior to the one by only the absorbance.<BR>(5) The identification limit of β-FeOOH coexisting with α- and γ-FeOOH in the infrared spectrum is about 65% and 25%, respectively. Even a amount of β-FeOOH, however, can be identified by, comparing the ratio of these absorbances with that obtained only β-FeOOH's present.
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