REDUCTION OF GADOLINIUM, DYSPROSIUM, HOLMIUM AND ERBIUM AT DROPPING MERCURY ELECTRODE (in Japanese)
Journal Article
·
· Nippon Kagaku Zasshi (Japan) Formerly Nippon Kagaku Kaishi (1921- 47) Merged with Kogyo Kagaku Zasshi to form Nippon Kagaku Kaishi
The influences of pH upon the current-potential curves and on the number of reducing electrons were studied for each ion(III) of gadolinium, dysprosium, holmium, and erbium. The waves apart from the hydrogen waves were observed in all cases of gadolinium, dysprosium, holmium, and erbium. The two-step waves (R/ sup 3+/ yields R/sup 2+/ and R/sup 2+/ yields R/sup 0/) were not observed in the solution of 0.1M LiCI with 0.01% gelatin. The half-wave potential of each ion under these conditions was --1.80 v vs. S. C. E. at pH 3.0, independent of the concentration of depolarizer, and shifted to more negative potential with decrease of pH (between approximately 2.3 to 5.0). The plot of log i/(i/sub d/-- i) against E/sub de/ gave a straight line with a slope of 0.02 v which coincides well with the theoretical value of 0.02 v, in the case of three electron- reduction at lower pH range than approximately 3.2, but the process of electrode reaction changed from reversible to irreversible nature at a higher pH rarge than 3.2. The limiting current was diffusion controlled for each ion. The diffusion current constant agreed well with the theoretical diffusion current constant (the reduction of Gd/sup 3+/ yields Gd/sup 0/, Dy/sup 3+/ yields Dy/sup 0/, Ho/sup 3+/ >s yields Ho/sup 0/, and Er/sup 3+/ yields Er/sup 0/ is assumed) calculated from the Klkovic equation, using the diffusion coefficient of each ion. The order of decreasing amounts of the differences between the standard potentials and half-wave potentials is parallel with radius of ions and with the decreasing amounts of basicity. (auth)
- Research Organization:
- Yamagata Univ., Japan
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-15-010892
- OSTI ID:
- 4093525
- Journal Information:
- Nippon Kagaku Zasshi (Japan) Formerly Nippon Kagaku Kaishi (1921- 47) Merged with Kogyo Kagaku Zasshi to form Nippon Kagaku Kaishi, Journal Name: Nippon Kagaku Zasshi (Japan) Formerly Nippon Kagaku Kaishi (1921- 47) Merged with Kogyo Kagaku Zasshi to form Nippon Kagaku Kaishi Vol. Vol: 81; ISSN NPKZA
- Country of Publication:
- Country unknown/Code not available
- Language:
- Japanese
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