<報文>光電分光光度計による比色法の研究(第8報) : フェニールフルオロンによるゲルマニウムの定量

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Spectrophotometric studies were made on the determination of germanium with phenylfluorone. A solution of phenylfluorone showed a deep absorption below Ca. 520 mμ. The complex of germanium with the reagent had a relatively sharp absorption around 504 mμ. The results obtained with various manufactures of the phenylfluorone were not in agreement with one another. Thus, for example, the shape and the band head of the absorption band were somewhat different from one another. The peak of the absorption band were of complex formed with a certain manufacture was found at 504 mμ. With others, at 504,506,508 mμ respectively. With the last three products, the fine precipitates of germanium complex had a tendency to coagulate and consequently absorbancies at 510 and 520 mμ decreased with standing. Whereas at the wavelengths of 530 and 540 mμ, it increased. The change was remarkable when the germanium content was high, e.g. at 45 γ/50 ml. At the concentration of 11.3 γ/50 ml., it was relatively small. The changes in absorbancy also differed from one another with the manufactures used. Linear relationship could not be obtained between absorbancies and amount of germanium with these products. Deviation was especially great when germanium content was high. At lower concentration of it deviation was also observed. On the contrary, when the former one was used for the developement of color, the definite absorbancy readings were obtained. They did not show any tendency to increase or decrease for about 5 hrs. after color developement and in concentration range from 11.3 γ/50 ml. to 45 γ/50 ml. Calibration curve at 510 mμ was nearly linear which passes through origin. At higher wavelengths, the curves bent upward at germanium concentration below 11.3 γ/50 ml. Neverthless, this reagent was decidedly excellent for the purpose of estimating germanium. Thus, it was found that the quality of the reagent should be carefully controlled. Because of the sharp decrease in the absorption of the complex within a narrow wavelength range, care should be taken to utilize precisely the same wavelength range for the determination. Besides arsenic, small amount of selenium accompanied with germanium in hydrochloric acid distillation. Presence of less than 100 γ/50 ml. of it had little effect on the determination of germanium.
1954-03-25

<報文>光電分光光度計による比色法の研究(第8報) : フェニールフルオロンによるゲルマニウムの定量

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