Yoshio Horibe

Scripps Institution of Oceanography

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Radical Polymerization of Styrene in Heavy p-Diethyl Benzene

Kobunshi Kagaku (1958)

Toshizo Titani Yoshio Horibe Mituko Kobayakawa

重合度の逆数1/Pと溶媒と溶質とのモル比S/Mとの関係から, 過酸化ベンゾイルを触媒として, p-ジエチルベンゼンの中でスチレンを重合させる場合にも, 無触媒の場合と同じように, 溶媒であるp-ジエチルベンゼンが連鎖移動反応に関与していることを確かめた。しかしながら, このことを同位体トレーサーの方法によって確かめるために, スチレンを同じく過酸化ベンゾイルを触媒として, ベンゼン核へ重水棄を入れたp-重ジエチルベンゼンの中で重合せしめたところ, 生成したポリス手レン中には, ポリスチレンの分子1個に対して, 4-10個の倉重ジエチルベンゼンの分子が移入されていることを発見した。このことから, 溶媒であるp-ジエチルベンゼンは, 連鎖移動の作によってスチレンの連鎖停止に関与するだけでなく, スチレンと共重合して, その分子中に移入されることが結論される。

Chain transfer

10.1295/koron1944.15.438

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Citations (2)

Abyssal circulation in the Japan Sea

Journal of Engineering Physics and Thermophysics (1983)

Toshitaka Gamo Yoshio Horibe

Abyssal zone

Potential temperature

Antarctic Bottom Water

Deep ocean water

Circumpolar deep water

10.1007/bf02070392

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Citations (154)

Combustion Apparatus of Organic Substances for the Determination of their Deuterium Content

Nippon kagaku zassi (1960)

Toshizo Titani Yoshio Horibe Sumie KODA

Content (measure theory)

10.1246/nikkashi1948.81.10_1624

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Citations (1)

Excess bottom222Rn profiles and their implications in the northwestern Pacific Ocean

Earth and Planetary Science Letters (1984)

Toshitaka Gamo Yoshio Horibe

10.1016/0012-821x(84)90088-8

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Citations (17)

Oxygen and hydrogen isotope ratios of monthly collected waters from Nasudake Volcanic Area, Japan

Journal of Geophysical Research Atmospheres (1970)

Minoru Kusakabe Hiroaki Wada Sadao Matsuo Yoshio Horibe

Monthly variation of δD and δ18O of two fumarolic condensates, five hot spring waters, two stream waters, and meteoric precipitation at the Nasudake volcanic area of Japan was measured. There was no remarkable variation with time in the isotopic ratios of the samples except for meteoric precipitation and for one of the hot spring waters. The δD and δ18O of meteoric precipitation showed seasonal change with summer maximum and winter minimum. The δD and δ18O of the stream waters and two of the hot spring waters were identical with those of average precipitation. On the basis of this fact and by using a simple mixing reservoir model, the residence time of precipitation water under the ground was calculated to be not shorter than a few years. Precipitation did not directly affect the isotopic ratios of volcanic waters. A general feature of the δD versus δ18O diagram for the above samples was similar to that for the samples obtained from worldwide geothermal systems, namely, thermal waters exhibited oxygen isotopic shift. Deuterium content of thermal waters was found to be higher than that of surface waters by 7‰ on the average. This slight enrichment of deuterium was inferred to be due to subsurface clay formation.

δ18O

10.1029/jc075i030p05941

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Citations (24)

Calcium in the South Pacific, and its correlation with carbonate alkalinity

Earth and Planetary Science Letters (1974)

Yoshio Horibe Keiko Endo Hiroyuki Tsubota

Alkalinity

10.1016/0012-821x(74)90040-5

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Citations (50)

Errors in sampling procedure for the determination of dissolved oxygen by Winkler method

Journal of Engineering Physics and Thermophysics (1972)

Yoshio Horibe Yukio Kodama Koji Shigehara

Atmospheric oxygen

Sampling error

10.1007/bf02108553

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Citations (7)

Deuterium abundance of natural waters

Geochimica et Cosmochimica Acta (1960)

Yoshio Horibe Mituko Kobayakawa

Natural abundance

10.1016/0016-7037(60)90078-8

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Citations (15)

Gas chromatographic separation of CO2 and N2O for measurements of .DELTA.13C in atmospheric CO2.

GEOCHEMICAL JOURNAL (1985)

Toshitaka Gamo Yoshio Horibe

A gas chromatographic method for separating CO2 and N2O was developed to measure 13C/12C ratios of atmospheric CO2. The mixture of N2O and CO2, which was condensed out from an air sample, was separated by passing through a column packed with porous silica beads, and only CO2 was recovered for δ13C measurements. It was confirmed that the gas chromatographic separation of CO2 does not change the δ13C value of CO2. Urban air samples in Tokyo and oceanic air samples in the northwestern Pacific were analyzed by using this method. The δ13C value of separated CO2 was shown to be 0.20 ± 0.03‰ greater than the value obtained when the CO2-N2O mixture was directly introduced to the mass spectrometer.

Chromatographic Separation

Atmospheric air

10.2343/geochemj.19.171

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Citations (7)

A Study on the Mechanism of the Catalytic Action of Manganese Dioxide on the Decomposition of Potassium Chlorate by Use of Heavy Oxygen as an Isotopic Tracer

Bulletin of the Chemical Society of Japan (1952)

S. Fukushima Yoshio Horibe Toshizo Titani

Abstract By use of heavy oxygen as an isotopic tracer, the following facts have been found; 1. At the catalytic decomposition of potassium chlorate in the presence of manganese dioxide, an unstable compound is formed between potassium chlorate and manganese dioxide, and oxygen gas is liberated by the decomposition of this intermediate compound. 2. The active part of manganese dioxide capable of composing such an intermediate compound with potassium chlorate is only a limited small portion of the particle. 3. Such an active part is readily destroyed by such a severe treatment as the heating of the catalyst in a vacuum at high temperature.

Chlorate

Sodium chlorate

TRACER

10.1246/bcsj.25.245

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Citations (0)