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Volume 17, Issue 4
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[in Japanese], [in Japanese]1971 Volume 17 Issue 4 Pages 79-92
Published: 1971
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (1759K) -
Su Chan MOON1971 Volume 17 Issue 4 Pages 93-100
Published: 1971
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe reactions of metal ions with various carboxylic acids including EDTA were investigated in DMF using the polarographic method. It was found that most of the metal ions form slightly soluble salts with EDTA before the formation of corresponding chelates ; alkali metal ions react with EDTA in the ratio of 4 : 1, alkaline earth metal ions and other bivalent cations in the ratio of 4 : 2, and trivalent cations such as iron and indium ions in the ratio of 4 : 3. Most of the metal complexes of EDTA formed in DMF were found to be more stable than those in aqueous solutions. Therefore, in 100% DMF these complexes, except complexes of iron (III), copper (II), rubidium (I) and cesium (I), showed no polarograpnic wave until the solvent was reduced. The behaviour of EDTA complexes in DMF were compared with that of the complexes formed with other carboxylic acids, such as oxalic, malonic, succinic, phthalic, acetic, benzoic and salicylic acids.View full abstractDownload PDF (892K) -
Kenji MOTOJIMA, Sorin KIHARA, Tadashi YAMAMOTO1971 Volume 17 Issue 4 Pages 101-108
Published: 1971
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSO wing to the relatively high redox potential of Pu(III)_??_Pu(IV) system (Eo=+0.97 volt vs. THE) and PU(IV)_??_Pu(VI) system (Eo=+1.04 volt vs. NHE), 1) polarographic study of plutonium with the dropping mercury electrode (D.M.E.) is fairly limited to the plutonium complex ions formed in strongly complexing agents. Therefore, most of studies have been made with the solid electrodes; Harvey and others'examined the electrolytic reduction of plutonium in 1 N sulfuric acid and 1 N hydrochloric acid at the platinum electrode, but they could not obtain good reporducible results and hence the reliable half-wave potentials. The reason was attributed to the easiness of the disproportionation and the hydrolysis of Pu(IV) to form polymers which would deposit on the surface of the platinum electrode. Similarly, Cook and others3) have investigated the polarographic oxidation of Pu(III) in 1 N hydrochloric acid and determined the half-wave potential as +0.66 volt vs. SCE. Koyama4) also examined Pu(III) in 2 N nitric acid and 1 N hydrochloric acid using square wave polarograph. D.C. polarographic studies with the D. M. E . were made by Nebel and Schwabe5) and Cook and others3) in acetate, citrate and oxalate solutions, and A. C, polarographic studies in citrate solution by Milner and Wood.6) The results are summarized in the Table 1. In the present study, the authors have investigated the polarographic behaviors of Pu(III) and Pu(IV) in mineral acid media at the rotating platinum electrode (R.-P.E.). Special attention was paid to the control of the oxidation state of plutonium throughout the experiments.View full abstractDownload PDF (767K) -
Gen P. SATO, Kanji HIGAKI1971 Volume 17 Issue 4 Pages 109-117
Published: 1971
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSThe anodic behavior of the dropping mercury electrode in the presence of hydroxide ion has been examined by the ac Polarographic method. Two ac waves were observed ; the wave at less positive potential is interpreted as the ac-reversible formation of a soluble species Hg(OH)2. Equa tions for the reversible process have been derived, which satisfactorily explain the experimentaldata.View full abstractDownload PDF (799K)
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