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Volume 15, Issue 4-5
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[in Japanese]1968 Volume 15 Issue 4-5 Pages 83-87
Published: 1968
Released on J-STAGE: June 28, 2010
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Bruno BREYER, Gen P. SATO1968 Volume 15 Issue 4-5 Pages 88-96
Published: 1968
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSA new type of a.e. wave that occurs in some supporting electrolytes (e.g., sulfate, nitrate, perchlorate) at high positive polarizations of the dropping mercury electrode is described. It has been named “predissolution wave” because it occurs at potentials of the beginning mercury dissolution. The wave is due to the exceeding of the solubility product of the mercurous salts of the respective anions. On the addition of salts whose anions form complexes with mercurous ions (e.g., thiosulfate, thiocyanate, sulfite), the peak of the wave shifted to more positive potentials and increased in height because of the solubilization of the film at the electrode surface. It was also found that the in-distinct a.c. wave obtained in thiosulfate solutions at +0.19V (S.C.E.) was transformed into a sharp peak on addition of chlorides ; the peak at first increased with increasing chloride concentration, to decline again at still higher chloride concentrations. The addition of serum albumin had the same effect on the predissolution wave as had complexing ions : the wave increased in height and its peak shifted to more positive potentials. Based on this finding, an analytical procedure was worked out permitting the estimation of serum protein in a concentration range fromn 2 to 200 μg/ml. Anodic a.c. polarography is a most sensitive method for the early detection of growing microorganisms, especially moulds, contaminating distilled water.View full abstractDownload PDF (1020K) -
Katsukiyo ITO1968 Volume 15 Issue 4-5 Pages 97-101
Published: 1968
Released on J-STAGE: June 28, 2010
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Tadashi YANAGI, Takashi NAGATA, Masaki KOBAYASHI, Mutsuaki SHINAGAWA1968 Volume 15 Issue 4-5 Pages 102-107
Published: 1968
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSUsing dropping mercury electrode, the electrochemical behaviours of uranyl ion dissolved in fused potassium thiocyanate at 185°C were investigated through ordinary polarography and chronopotentiometry. Reproducible polarogram and chronopotentiogram, both consisted of two reduction waves for uranyl ion were obtained. Limitting current for the first step of the polarogram was proportional to the uranyl ion concentration and the square root of the mercury height at constant depolarizes concentration, but not for the second. No linear relationship was obtained in the log [il(id - i)] vs. E plots for both the first and second waves. The i0τ11/2-values for the first step of chronopotentiogram at constant uranyl ion concentration were independent of the current density at the polarized electrode and proportional to the bulk concentration. A plot of log {(τ11/2 - t1/2)/t1/2} vs. E yields a straight line for the first step and the average reciprocal slope (0.0993) is in good agreement with the theoretical value (0.091) in the case of n = 1 at 185°C. The ratio of τ2/τ1 was calculated for two successive reduction steps to be about 3. According to these observations it is clearly concluded that electroreduction procces of uranyl ion is diffusion-controlled and proceeds to two steps as follows ;UO22+ + e = UO2+ (1)UO2++ e = UO2 (2) The diffusion constant of uranyl ion in this melt at 185°C was calculated from Sand's equation to be 6.56 × 10-7 cm2/sec, which is about one-third compared with that for lead ion in the same melt at the same temperature.View full abstractDownload PDF (743K) -
Mutsuaki SHINAGAWA, Hiroyuki NEZU, Akihiko MUROMATSU, NOBUYUKI YANO1968 Volume 15 Issue 4-5 Pages 108-114
Published: 1968
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (843K)
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