| Project/Area Number |
09480114
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | Saitama University |
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Principal Investigator |
SAKAMOTO Kazuhiko Department of Environmental Science and Human Engineering, Graduate School of Science and Engineering, Saitama University, Professor, 大学院・理工学研究科, 教授 (20111411)
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| Co-Investigator(Kenkyū-buntansha) |
ISHIHARA Hidekazu Department of Applied Chemistry, Faculty of Engineering, Saitama University, Res, 工学部, 助手 (20261878)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥7,900,000 (Direct Cost: ¥7,900,000)
Fiscal Year 1998: ¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1997: ¥4,700,000 (Direct Cost: ¥4,700,000)
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| Keywords | desert soil / Yellow sand particles / sulfur dioxide / dry deposition / deposition velocity / basicity / relative humidity / photoirradiation / 中国砂漠土壌 / ニ酸化硫黄 / 不均一反応 / 光触媒 / 人工肺 / 濃瓊測定法 / 酸性ガス |
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| Research Abstract |
In order to obtain the fundamental data to estimate the removal amount of SO_2 from the atmosphere by its dry deposition on the Chinese desert and yellow sand soils, we investigated the exposure of the above soils and several model soils to the experimental gases containing trace level of SO_2, NO_2, or HNO_3. The results obtained by the above exposure experiments etc, were summarized as below.
1) Elemental analyses for desert yellow sand soils in China were achieved. The results indicated the intimate relation of acidity of soil particles with content of Ca. It suggests the relation of soil acidity with the frequency of acid rain appearence.
2) Dry deposition velocity of SO_2 to desert and yellow sand soils in China depended on soil alkalinity and humidity of exposure gas.
3) Dry deposition velocity of HNO_3 to various soils was similar level of that of SO_2. While, that of NO_2 was much lower than that of SO_2.
4) S(VI)/S(IV) deposited on desert, yellow sand, and model soils was increased with increase in the humidity of exposure gas and the irradiation time with a simulated sun-light (black-light).
5) The artificial lung was applied to collection of low concentration SO_2 and gaseous HNO_3.
6) In order to estimate the removal amount of SO_2 from the atmosphere by its dry deposition on the Chinese desert and yellow sand soils, further investigation is needed.
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