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Volume 4, Issue 10
Displaying 1-15 of 15 articles from this issue
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WATARU FUNASAKA, MAKOTO KAWANE, TSUGUO KOJIMA, KOKICHI ISHIHARA1955 Volume 4 Issue 10 Pages 607-610
Published: December 05, 1955
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSColorimetric determination of a sample solution of NaF containing less than 10p.p.m. F- were made by use of a) ferric thiocyanate method, b) ferric salicylate method, c) thorium alizarin method, d) zirconium alizarin method, and e) aluminum hematoxylin method in the presence or absence of the disturbing ions. Within the range of showing linear transmittancy coefficient against the concentration, statistical interpretation of the result by Youden method was applied and found that the b) method was disturbed by CO--3, and that of the a) and c) methods by SO--4, The b) method was the most suitable for determination of less than 10p.p.m. F-, since this method required less time, reagents used are stable and the method has good accuracy and high sensitivity. Also, c) or d) method was suitable for determination of less than 5p.p.m. F-.View full abstractDownload PDF (846K) -
Electrolytic Separation of Copper from Bismuth by Use of EDTAHISAO HAYAKAWA, MASAYOSHI ISHIBASHI, TAICHIRO FUJINAGA1955 Volume 4 Issue 10 Pages 610-616
Published: December 05, 1955
Released on J-STAGE: May 07, 2010
JOURNAL FREE ACCESSEDTA has been used for electrolysis of copper and good results have been obtained to make lustrous and quantitative deposit of copper. Measurements of the deposition potentials of copper and bismuth at a rotating platinum electrode and the half-wave potentials of them at a dropping mercury electrode from their EDTA solutions of various pH values have been made. The optimum quantity of EDTA, the pH value, the cathode potential, the anodic depolarizer, and the permissible quantity of bismuth have been tested for separation of copper from bismuth and the following procedure has proved to give good results. A sample solution containing copper and bismuth is treated with 2-3times moles as much EDTA against the copper plus bismuth, 1g ammonium nitrate and 1.5 g hydroxylamine hydrochloride are added, the solution is diluted with water to 140ml whose pH is adjusted to 3.1, and electrolyzed at 6070°C, with the cathode potential kept at -0.41V. vs. S. C. E. automatically. The results indicated that copper can be electrolyzed quantitatively in the presence of less than 1.2g bismuth, while that with 1.3g bismuth the trifle error of +0.50.6mg comes out.View full abstractDownload PDF (1411K) -
SHIZO HIRANO, TSUTOMU FUKASAWA1955 Volume 4 Issue 10 Pages 616-621
Published: December 05, 1955
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSA method of quantitative determination of vanadium by light absorbancy method with the use of sodium diphenylamine sulfonate has been established. Various conditions of this method have been investigated and found that the following procedure gave the best restul: the total volume of the solution for light absorbancy test was made to 100ml, in which contained 40ml sulfuric acid (1:1), 15 ml phosphoric acid and ferric sulfate equivalent to 0.05-0.5g iron. After oxidation of the vanadium, 2ml 0.05% sodium diphenylamine sulfonate was added for color development. The coloration was unstable when the concentration of sulfuric acid and phosphoric acid were low, but it became stable by increasing the concentration of the acids and more stable coloration was obtained by adding iron salt, also, the effect of temperature became less and better reproducibility was obtained under those conditions; the relation between vanadium and light absorbancy was linear up to 350γ of vanadium. In the determination of vanadium in iron sand by this method, 0.1g sample was decomposed with 15ml phosphoric acid, the development of color was made by the above procedure and the result of analysis of 19 samples of iron sand is tabulated, the time required for this method is 25 minutes.View full abstractDownload PDF (1376K) -
HISAKAZU NAKATA, YUZURU KUSAKA1955 Volume 4 Issue 10 Pages 621-623
Published: December 05, 1955
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSFor indirect volumetric analysis of sulfate the general method of adding a definite excess of barium ion against the sulfate has been used for formation of the precipitate of barium sulfate, then the remaining barium ion is estimated by use of various reagents;in this connection, the writersinvestigated a new method of using sodium palmitate as a quantitative reagent. The method is to adda definite excessive amount of sodium palmitate against the residual barium ion, the precipitate of barium palmitate thus formed is aged in alcohol as a solvent, the precipitate is filtered, an equalvolume of benzene is added to the filtrate and the remaining sodium palmitate is determined by titration with a standard acid solution for-an indirect estimation of sulfate. The end point of titration can be determined by potentiometric titration with the use of antimony electrode or 2, 4, -or 2, 6, m-dinitrophenol as an indicator. A microdetermination of 110 mg SO--4is possible by use of this method.View full abstractDownload PDF (648K) -
Some Infrmations on the aPPlication of the MethodTOMOO TAKAGI1955 Volume 4 Issue 10 Pages 624-627
Published: December 05, 1955
Released on J-STAGE: May 07, 2010
JOURNAL FREE ACCESSIn the indirect determination of carbon by estimating the iodine-evolved in the reaction of elementary carbon and iodic acid (Preceedingl Report), an improvement of the apparatus was made for the accurate determination and the good results were obtained. Tests on the kinds of strong phosphoric acid to be used were carried out. By the use of the strong phosphoric acid prepared by dehydration of orthophosphoric acid of the density 1.75 until its temperature reached about 300°C and by means of this improved apparatus, the rapid and accurate determination of graphite became possible. Since it was found that, in the case of the strong phosphoric acid of lower concentration, only graphite showed lower rate of oxidation, a separate determination of crystalline carbon and amorphous carbon was attemped by using Torthophosphoric acid of the density 1.75 and an approximately identical result was obtained by using an equal-amount mixture of activated carbon:and graphite or acetylene black and graphite.View full abstractDownload PDF (846K) -
Ion Exchange SeparationKAZUNOBU KODAMA, TERUYUKI KANIE1955 Volume 4 Issue 10 Pages 627-629
Published: December 05, 1955
Released on J-STAGE: May 07, 2010
JOURNAL FREE ACCESSSeparation of zinc from aluminium by use of anion exchanger has been reported by Miller and Hunter, and Rush and Yoe. These methods have been applied by the writers on the determination of zinc in aluminium alloys. The result indicated that zinc in about 2N HCl was adsorbed in Amberlite IRA-410 (Cl-form) and it was liberated completely by 0.1N HNO3, then zinc was determined by EDTA method. When the alloy contained large amount of lead and silicon, those were removed by evaporating with sulfuric acid, diluting, filtering and SO--4 was removed by passing through Amberlite IR-120 (NH4-form), then the effluent by 2N HCl was used for the determination of zinc by the above method. An addition of a small amount of nonionic surfectant to the sample solution or washing solution enabled smooth operation.View full abstractDownload PDF (742K) -
TETSURO MURAKAMI1955 Volume 4 Issue 10 Pages 630-633
Published: December 05, 1955
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSAs a rapid determination of nitric acid or nitrate radical in sample acidified with concentrated hydrochloric acid, the solution was reduced with ferrous sulfate solution in the atmosphere of carbon dioxide, the Fe+3 thus formed was titrated, while hot, with a standard stannous chloride solution and the following results were obtained:
(1) An addition of 20ml 1N FeSO4 solution to 70 ml concentrated HCl and boiling for 5 minutes resulted a complete reduction of nitrate radical.
(2) Application of this method to the determination of ammonium nitrate in concentrated ammonium sulfate solution gave a result in 10-12 minutes and the result agreed with that determined by nitrometer method.
(3) Application of this method to the determination of nitric acid in nitric acid-sulfuric acid mixture, and a correction was made by a separate determination of N2O4 in the mixed acid, gave aresult agreed well with that of nitrometer method.View full abstractDownload PDF (984K) -
YUJI TAKAYAMA1955 Volume 4 Issue 10 Pages 634-636
Published: December 05, 1955
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSThe importance of problem of the determination of residual monomer in polymethyl methacrylate is increasing and it is desirable to find a simple and rapid method for its analysis. The following method is to dissolve the sample in glacial acetic acid, to which water is added, and distill to obtain a liquid containing the monomer, water and acetic acid, and the distilate is used for ultraviolet spectroscopic analysis. The acetic acid contained therein is estimated by titration with alkali and the value obtained from spectroscopic analysis is corrected. This method gives a simple and good reproducible result, provided that the necessary caution is taken as it has absorption in ultraviolet zone, also it gives an error when the sample contained some substance which distill off during the distillation, and this problem has been discussed.View full abstractDownload PDF (556K) -
[in Japanese]1955 Volume 4 Issue 10 Pages 637-638
Published: December 05, 1955
Released on J-STAGE: June 30, 2009
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[in Japanese]1955 Volume 4 Issue 10 Pages 638-639
Published: December 05, 1955
Released on J-STAGE: June 30, 2009
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[in Japanese], [in Japanese]1955 Volume 4 Issue 10 Pages 639
Published: December 05, 1955
Released on J-STAGE: June 30, 2009
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[in Japanese]1955 Volume 4 Issue 10 Pages 640-646
Published: December 05, 1955
Released on J-STAGE: June 30, 2009
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[in Japanese]1955 Volume 4 Issue 10 Pages 646-657
Published: December 05, 1955
Released on J-STAGE: June 30, 2009
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[in Japanese]1955 Volume 4 Issue 10 Pages 658-666
Published: December 05, 1955
Released on J-STAGE: June 30, 2009
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1955 Volume 4 Issue 10 Pages 669
Published: 1955
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (179K)
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