Review of Polarography
Online ISSN : 1884-7692
Print ISSN : 0034-6691
ISSN-L : 0034-6691
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Volume 12, Issue 3
Displaying 1-4 of 4 articles from this issue
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  • Extraction-Polarograpy Applied to the Microdetermination of Phosphate
    Tomihito KAMBARA, Kenjiro HAYASHI, Yoshinori KAMIYA
    1964 Volume 12 Issue 3 Pages 71-75
    Published: 1964
    Released on J-STAGE: October 21, 2011
    DOIhttps://doi.org/10.5189/revpolarography.12.71
    JOURNAL FREE ACCESS
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    Phosphate ion can be polarographically determined by adding a known amount of molybdate and measuring the diffusion current due to the reduction of the excess molybdate. This method, however, is disadvantageous to the spectrophotometric one, because the polarographic procedure is less sensitive and interfered by several other constituents. In the present study a new method is developed in which the phosphate ion is extracted as phosphomolybdate into methyl isobutyl ketone and to the organic extract is added aqueous electrolyte solution and methylcellosolve, resulting in a homogeneous solution, in which the hexavalent molybdenum shows prominent and well-defined a.c.polarographic peaks. Fujinaga and others, employed a ternary mixture of chloroform-hydrochloric acidmethylcellosolve system as a polarographic . electrolyte-solvent and succeeded elegantly in the microdetermination of lead by means of diethyldithiocarbamate extraction. In the present study the Takeuchi-Ishii method for the phosphomolybdate extraction into methyl isobutyl ketone was utilized and the polarographic behavior of molybdate ion in the ternary electrolyte-solvent composed of methyl isobutyl ketone, methylcellosolve and an aqueous solution of various electrolytes is investigated. The a.c. polarographic method by Breyer has shown in this case an excellent result. Thus, about hundred microgram quantity of phosphate can easily be determined a.c. polarographically after the phosphomolybdate extraction.
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  • Polarographic Studies with the Improved Dipping Type Molybdenum Microelectrode. (I) Polarography in aqueous solution.
    Makoto SAITÔ
    1964 Volume 12 Issue 3 Pages 76-85
    Published: 1964
    Released on J-STAGE: October 21, 2011
    DOIhttps://doi.org/10.5189/revpolarography.12.76
    JOURNAL FREE ACCESS
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    The polarographic behavior of a number of ions was studied by use of an improved dipping type microelectrode. Cathodic waves were obtained from the solution of :hydrogen and various metal ions, and an anocUc wave from hydroxyl ion. The wave heights were directly proportional to the concentration of the reducible species. For .example, the ratios of the limiting currents to the concentrations of metal ions were 1, 00 - 104 and 1.08 - 104 μA/M for Cd(II) and Co(II) ions, respectively. The applied voltage plotted against log(i4d - i)/i gave a straight line, but the slope of the straight line showed a larger value than the theoretical value which is expected when the electrode reaction is reversible. The half-wave potential remained nearly constant with the change of the concentration of reducible species and of the scanning rate of applied voltage. An AC polarographic peak was not observed for cobaltous ion with this electrode.
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  • Polarographic Studies with the Improved Dipping Type Molybdenum Microelectrode (II) Polarography in Fused KCl-LiCl Eutectic Media
    Makoto SAITO
    1964 Volume 12 Issue 3 Pages 86-99
    Published: 1964
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.5189/revpolarography.12.86
    JOURNAL FREE ACCESS
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    [in Japanese]
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  • Dual Effect of Surface Active Substances on the Reduction of Copper (II) Ions
    Taitiro FUJINAGA, Satoshi OKAZAKI
    1964 Volume 12 Issue 3 Pages 100-101
    Published: 1964
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5189/revpolarography.12.100
    JOURNAL FREE ACCESS
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