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Volume 10 (1961 - 196･･･
- Issue 4 Pages 181-
- Issue 3 Pages 131-
- Issue 2 Pages 83-
- Issue 1 Pages 1-
Volume 10, Issue 1
Displaying 1-6 of 6 articles from this issue
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Takanobu HAMAGUCHI1961 Volume 10 Issue 1 Pages 1-8
Published: 1961
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (2309K) -
Norihito SUZUKI1961 Volume 10 Issue 1 Pages 8-15
Published: 1961
Released on J-STAGE: June 28, 2010
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Ichiro TAIRA, Masahiko BABA1961 Volume 10 Issue 1 Pages 16-22
Published: 1961
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe electrode used for the study is of a right pyramid cut out from a carbon rod of 6mm in diameter.The counter electrode is of the same make.When the pyramidal part of the electrode is steeped in a sample solution and taken out immediately, the sample solution that adhered to the electrode becomes hemispherical by its surface tension with the diameter of the electrode.In ignition, a capillary pippet is provided to supply the sample solution to maintain a stable and continuous excitation. When compared with rotating disk electrode, porous cup electrode and metallic pin electrode, pyramidal electrode was found equal to metallic pin electrode in reproducibility and rapididity of analysis.View full abstractDownload PDF (768K) -
Shoushiro SAKAI, Kouichi YOSHINO1961 Volume 10 Issue 1 Pages 23-36
Published: 1961
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSCobalt-based heat-resisting alloys are spectrochemically analyzed in two ways: ingots are sparked directly by point to plane method and solution-dissolved samples are excited by rotating electrode.
The first method gives rise to large errors due to surface constitution of the metal, but if homoge-neous line pairs are chosen for the analysis and if the excitation condition is such as to make the samples vapourize smoothly, acceptable precision (2-5%) can be expected for some elements.
The second method, the solution method with rotating disk electrode, can be used regardless of the size, shape or history of the sample, besides, it provides ease of standard sample preparation.Anal-ytical results show good agreements with those of chemical analysis, but reproducibillity variss by elements and their concentration: it was 1.22% for Cr and 24.2% for Ni.Main error in this method arises from the spectral intensity being affected by acid concentration and difference of electrode porosity.
The methods dealt with in this paper seem to be applicable to routine analysis of any heat-resiting alloy.View full abstractDownload PDF (4008K) -
Tsutornu TAKAHASHI, Shoushiro SAKAI, Kouichi YOSHINO1961 Volume 10 Issue 1 Pages 36-45
Published: 1961
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSFor spectrochemical analysis by solution technique, various electrodes-orous cup electrode, rotating disk electrode, suck-up electrode and others-are being used.Among these, rotating disk electrode seems preferable, for it is simple and economical in treating a large number of samples. Fundamental of this technique, however, does not seem to have been fully studied. With solutions of copper alloys, the effect of particulars of rotating disk electrode and solution on the analysis is studied and the following conclusion is drawn.
1.Machining accuracy of the electrode influences the accuracy of analysis.
2.Coefficient of correlation between porosity of the disk and spectral intensity is negative.
3.Excitation with sulphuric acid is less in spectral intensity than with aqua regia but has good reproducibility.
4.As to internal standard elements, bismuth, cobalt, indium and molybdenum are found satisfactory for analysis of copper alloys.View full abstractDownload PDF (1169K) -
Kouichi YOSHINO, Shoushiro SAKAI, Masao KANEKO1961 Volume 10 Issue 1 Pages 45-56
Published: 1961
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSIn spectrochemical analysis of low steel alloys including nitralloy, when excited by oscillating, discharge (V=940 V, C=5μF, R=residual and L=360μH), matrix effect is observed as changes in line intensities and their ratios. For the purpose of eliminating the matrix effect, excitation characteristics are examined by varying the gas in the spark chamber. The gases used are mixtures of oxygen, nitrogen and argon. Introduction of oxygen has suppressing effect on vapourization of samples resulting in weakening of whole line intensities and in increasing ionic to atomic line intensity ratios. With a mixture of nitrogen and argon, ionic to atomic line intensity ratio is different for every different sample because of the difference in matrix effect. Overdamped discharge (V=40V, C=5μF, R=50Ω and L=360μH) in air or introduction of argon into the spark chamber reduces approciably the matrix effect.View full abstractDownload PDF (1504K)
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