Review of Polarography
Online ISSN : 1884-7692
Print ISSN : 0034-6691
ISSN-L : 0034-6691
Volume 17, Issue 5-6
Displaying 1-5 of 5 articles from this issue
  • [in Japanese]
    1971 Volume 17 Issue 5-6 Pages 119-120
    Published: 1971
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
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  • Yukiharu YAMAZAKI
    1971 Volume 17 Issue 5-6 Pages 121-132
    Published: 1971
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    Fundamental studies for the application of anodic stripping method to practical analyses have been done by use of the balanced head stationary hanging mercury drop electrode (BHMDE). Dependence of stripping peak current (lpa) on the experimental variables satisfied the following relation : Ipa.∝r02CR∝D2/3C0tr0-1ν-1/62. The relationship between lpa and pre-electrolysis potential has been examined for 1×10-6M Cu, Bi, Pb, Cd, In and Zn in supporting electrolytes of several kinds.The effect of the surface active substance on the stripping polarogram has also been examined. As for practical application, Pb and Cd in zinc metal and Pb, Cd and Zn in potassium chloride reagent have been determined. Anodic stripping polarography has been recognized to be very useful in the determination of micro-amounts of metal ions in solution and a number of reports had appeared during the last decade, for instance, on the structure of electrode assembly, the processes of electrode reactions and basic problems for the application of this method to practical analyses.The author has previously reported a new type of the hanging mercury drop electrode, “Balanced head stationary hanging mercury drop electrode” (BHMDE), which has been proved to have excellent reproducibility of the mercury drop size . Further, it is easy with this electrode to control the size of the electrode by selecting the duration of mercury run-off. For the application of the BHMDE to the anodic stripping method, the author has examined the fundamentals in voltammetric analysis with the BHMDE, i.e., the dependence of anodic stripping current on the radius of the electrode, the stirring velocity during pre-electrolysis, the potential and the period of presence of surface-active substances. Experimental results and an example of the application is presented in this paper.
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  • Toyoshl NAGAI, Toshio MATSUDA
    1971 Volume 17 Issue 5-6 Pages 133-140
    Published: 1971
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    The Polarographic behavior of N-bromosuccinimide (NBS) at a rotating platinum electrode (RPE)was investigated. NBS gave a well-defined reduction wave in an electrolyte solution containing 0.1MKNO3 and Britton-Robinson buffer at pH 5.0. The wave obtained at a RPE with the activated surface, resulting from the reduction of platinum oxide layer on the preoxidized electrode, showed the half-wave potential at +0.75V vs. SCE. The diffusion current at -0.2V was directly proportional to the concentration over the range from 10-3 to 2×10-5 N NBS, and its temperature coefficients was 1.8%/°C at 25°C The number of electron involved in the electrode reaction of NBS was 2. Hydrazine sulfate over the concentration range from 10-3 to 3×10-5 N could be determined amperometrically with NBS by use of a RPE within an error of ±2%.
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  • H.H. BAUER, D. BRITZ, F.M. HAWKRIDGE, A.K. SHALLAL
    1971 Volume 17 Issue 5-6 Pages 141-144
    Published: 1971
    Released on J-STAGE: March 01, 2011
    JOURNAL FREE ACCESS
    In an earlier publication, we drew attention to and explained the phenomena of "negative" ac polarographic waves and of complex-shaped waves with both negative and positive portions. These, as was shown, need not be due to particular electrochemical properties of the relevant system under scrutiny (or even to instrumental errors), but may arise simply from the vectorial combination of the various impedances that make up an electrochemical cell. In that publication, we dealt only with normal, total-component ac polarographic curves. Since then, we have built an ac/dc potentiostatic polarograph based on the paper of Brown, Smith and Booman and in using it have found that, when recording phase-selective polarograms, one obtains markedly negative waves for the 90.K-phase component at far lower frequencies than in normal, total-component polarography. We have investigated this with some computer calculations and report the results here. Negative waves as described are likely to be encountered more and more frequently in view of the increasing use of phaseselective ac instruments.
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  • [in Japanese], [in Japanese], [in Japanese]
    1971 Volume 17 Issue 5-6 Pages 145-148
    Published: 1971
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
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