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Volume 12 (1964 - 196･･･
- Issue 28 Pages 183-
- Issue 27 Pages 131-
- Issue 26 Pages 65-
- Issue 25 Pages 1-
Volume 12, Issue 25
Displaying 1-7 of 7 articles from this issue
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(I)Determination of Isotopic Abundance Ratio of 13C Enriched Carbon FilmsTUTOMU MAKITA, KUMASABURO KODERA1964 Volume 12 Issue 25 Pages 1-6
Published: May 30, 1964
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe abundance ratio of 13C enriched carbon films was determined by means of Mattauch-Herzog type mass spectrographs. Electrodes of type C(Au)/(Pt)for the vacuum spark ion source were mounted. Platinum isotope mass spectra on the same photographic plate were utilized for the determination of the characteristic curve of the plate. The mean values of 13C isotope ratio of the carbon films were determined by mass spectrography. And 13C isotope ratio of methane, raw material of the carbon film, was determined by mass spectrometry. These isotope ratios have been considerably agreed. Reproducibility and a accuracy of the measurements, errors due to the photographic plate, variation of line width, and intensity of CH5+ion have been discussed.View full abstractDownload PDF (676K) -
(II)On the Geochemical CycleMAKOTO SHIMA1964 Volume 12 Issue 25 Pages 7-16
Published: May 30, 1964
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe sum of the geochemical cycle of each element should have an average equal to its primary value. Therefore, it should be possible to obtain an isotopic balance for eache lementin the crust. The parameters involved are: the concentration of these elements in the igneous, sedimentary and marine divisions of the crust, the amounts of each environment, and the isotopic cornposition of these elements in it. Hence, isotope ratio data provide. an independent method of estimating the quantities of the imnportant divisions of the crust. From this standpoint, we can estimate the mean average value of the crust and the mantle. The abundance data herein are restricted to the lithosphere, marine hydrosphere, and the cosmosphere exclusive of tektite. The individual contributions to the abundance data from other divisions, such as the hydrothermal ore deposits, the biosphere, the atmosphere etc., are negligible. One general feature of the geochernical cycles of boron and lithium isotopes is discussed by comparing them to the sulfur isotope cycle. The mean values of their abundances and their isotope abundance ratios in the crust were assumed to be roughly 12.7g/ton(B), 20.0g/ton(Li), and 4.07(B11/B10), 12.5(Li7/Li6).View full abstractDownload PDF (976K) -
(III)On the Estimation of the Isotope Ratio in the MantleMAKOTO SHIMA1964 Volume 12 Issue 25 Pages 17-20
Published: May 30, 1964
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSUp to the present time, the question of the chemical composition in the interior of the earth and of the isotopic ratio in those parts has been debated. It is supposed that the average composition of the interior layer of the earth resemble that of certain types of rocks and meteorites. For example, the interior may be represented by dunite, eclogite and peridotite. Or it can be represented by meteoritic composition. For any theories concerning the model composition of the interior, one might conclude that elements such as Li, Na, K, Ca, Al, and halogens are concentrated toward the earth's surface, while S, Mg, Fe, and Ni are enriched in the deeper layer. In order to estimate the isotope ratio in the mantle, the following cases are discussed. (1)The isotope ratio in the mantle might have a composition similar to the meteoritic value. (2)The isotope ratio in the mantle might have a composition similar to the terrestrial value. And(3)the isotope ratio in the mantle is different from that of the meteoritic composition or of the terrestrial composition. The mean value of isotopic compositions for the mantle must be important in order to estimate it in the nuclear synthesis theory or in the cosmo-chemistry.View full abstractDownload PDF (574K) -
II.Determination of Lithium Content in Some Alkali ReagentsSETSUO TANIGUCHI, IZUMI SHIONOYA, TERUO HAYAKAWA, HITOSHI TSUYAMA1964 Volume 12 Issue 25 Pages 21-24
Published: May 30, 1964
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe determination of lithium in potassium sulfate, sodium carbonate and sodium hydroxide by isotope dilution method was studied. The results obtained are(1.01±0.17)×10-8g/g of lithium in the potassium sulfate sample, 9.78×10-8g/g of lithium in the sodium carbonate sample and 2.19×10-7g/g of lithium in the sodium hydroxide sample. The lithium content in the barium chloride sample was measured to be 1.36×10-8g/g.View full abstractDownload PDF (323K) -
FUSAFUMI NAKAO1964 Volume 12 Issue 25 Pages 25-36
Published: May 30, 1964
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe reproducibility and the accuracy of mass spectra are affected by several factors. Among these factors, the effect of ion source temperature has been studied. The ion current intensity of most ions decreases with increasing ion source temperature. The parent ion of hydrocarbons decreases more rapidly than the fragment ions. This effect becomes larger with increasing carbon numbers. The parent ion abundance is reduced with increasing the carbon numbers and the reduction depends upon the ion source temperature. In the experimental temperature range, 100-300°C, such effects are more pronounced in the complex compounds than in the simple one. The temperature dependency on mass spectra of paraffin compounds is larger than those of olefin and diolefin.
Stevenson's hypothesis has been established not only for the inorganic gases but for the parent ion of lower hydrocarbons and their fragmentary ions. It is seen that the a in Stevenson's equation depends upon M-1/2 for the inorganic gases. Also this relation holds approximately for the parention of hydrocarbons. The kinetic energy due to the effect of ion source temperature is dominant for the inorganic gases and the parent ion of hydrocarbons, while the vibrational energy due to that effect is predominant for the fragmentary ion of hydrocarbons.
The temperature coefficient of mass spectra is within 0.2 %/°C for rare gases, 0.25%/deg;C for active gases and0. 35%/deg;C for parent ion of hydrocarbons.View full abstractDownload PDF (2299K) -
Qualitative Analysis of the Aromatic Fraction in High Boiling Range of Petroleum.SHOZO OSHIMA1964 Volume 12 Issue 25 Pages 37-46
Published: May 30, 1964
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe mass spectrometric investigation was undertaken to analyse qualitatively aromatic hydrocarbons and thiophenic sulfur compounds separated from the aromatic fraction in high boilingrange of petroleum. The identification of the compound types was made by the characteristics of cleavage mechanism of aromatic hydrocarbons and thlophenic sulfur compounds under electron bombardment and the results of low voltage ionization method. By this method, alkylbenzene, alkyl monocyclobenzene, alkylnaphthalene, alkylphenanthrene, alkylbenzothiophene, alkyl 2, 3-dihyd obenzothiophene, alkyl dibenzothiophene and alkyl tetrahydrodibenzothiophene were determined.View full abstractDownload PDF (1062K) -
HISASHI MATSUDA1964 Volume 12 Issue 25 Pages 47-58
Published: May 30, 1964
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESS
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