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1996 Fiscal Year Final Research Report Summary

Fundamental Study for Behavior of Pollutants in the Formation of Ice Fog

Research Project

Project/Area Number 07680561
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Environmental dynamic analysis
Research InstitutionOsaka Prefecture University

Principal Investigator

TAKENAKA Norimichi  Osaka Prefecture University, College of Engineering, Research Asistant, 工学部, 助手 (70236488)

Project Period (FY) 1995 – 1996
KeywordsAcid rain / Aerosol / Freeze concentration / Freezing potential / Nitrous acid / Chlorine loss / Ice and snow
Research Abstract

We found that the acceleration mechanism of nitrous acid oxidation by dissolved oxygen in the freezing process is freeze concentration effect of the reactants into unfrozen solution confined between ice grains. The concentration factor of nitrous acid is estimated to be 2400 at -3゚C.In the study of evaporation loss of solutes from solution, it is found that solutes evaporate from the frozen sample to gas phase with stand time. This is also due to freeze concentration of solutes into the surface of the sample. The electrically neutral acid forms by bonding with proton which increase by freezing potential and evaporates into gas phase. The order of the evaporation rates of solutes we investigated was formic acid>acetic acid>propionic acid>butyric acid>hydrochloric acid>>nitric acid. The results we obtained suggest that the evaporation rate depends on mainly acid dissociation constants and also boiling points
In the field measurements for rain, fog and snow, concentrations of nitrite in winter sample were much smaller than those in summer and fog sample. This result suggest that nitrite is oxidized by freezing in the environment. Further, the ratio of concentration of chloride to that of sodium ion in winter was smaller that that in summer. One possibility of this loss is evaporation loss by freezing, but further study is needed. Some reports suggest that the evaporation loss of acetic and formic acids from snow pack in Antarctic or Green Land. It is required whether or not the changes of solutes by freezing occurs the environment and how amounts of solutes evaporate.

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] N.Takenaka, A.Uedaet al.: "Acceleration Mechanism of Chemical Reaction by Freezing:The Reaction of Nitrous Acid with Dissolved Oxygen" J.Phys.Chem.100(32). 13874-13884 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Sato, T.Daimon, N.Takenaka, et al.: "Decrease of Solute in the Aqueous Solution in the Freezing Process" Proc.NIPR Symp.Polar Meteorol.Glaciol.10. 138-148 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.-E.Yoo, , N.Takenaka, et al.: "Decomposition of Geosmin in Aqueous Solution by Sonication" Chem.Lett.1995. 961-962 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] X.-C.Hu, N.Takenaka, et al.: "Mechanism of Chemiluminescence Reaction between Hypobromite and Ammonia or Urea" Bull.Chem.Soc.Jpn. 69(5). 1179-1185 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 藤森 啓一、北野 優、竹中 規訓、他: "アルコールオキシダーゼを用いる比色法によるメタノール及びホルムアルデヒドの分別定量" 分析化学.45(7). 677-682 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 劉永億、竹中 規訓、坂東 博、他: "超音波照射による臭気物質の除去" 臭気の研究. 27(3). 143-149 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 竹中 規訓: "凍らせると速くなる反応" 日本食品低温保蔵学会誌. 21(3). 143-151 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Takenaka, A.Ueda, T.Daimon, H.Bandow, T.Dohmaru and Y.Maeda: "Acceleration Mechanism of Chemical Reaction by Freezing : The Reaction of Nitrous Acid with Dissolved Oxygen" J.Phys.Chem.100 (32). 13874-13884 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Sato, T.Daimon, N.Takenaka, H.Bandow and Y.Maeda: "Decrease of Solute in the Aqueous Solution in the Freezing Process" Proc.NIPR Symp.Polar Meteorol.Glaciol.10. 138-148 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.-E.Yoo, N.Takenaka, H.Bandow, Y.Nagata and Y.Maeda: "Decomposition of Geosmin in Aqueous Solution by Sonication" Chem.Lett.1995. 961-962 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] X.-C.Hu, N.Takenaka, M.Kitano, H.Bandow and Y.Maeda: "Mechanism of Chemiluminescence Reaction between Hypobromite and Ammonia or Urea" Bull.Chem.Soc.Jpn. 69 (5). 1179-1185 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Fujimori, M.Kitano, N.Takenaka, H.Bandow and Y.Maeda: "Selective Determination of Methyl Alcohol and Formaldehyde by Colorimetry Using Alcohol Oxidase" Bunseki Kagaku. 45 (7). 677-682 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.-E.Yoo, N.Takenaka, H.Bandow, Y.Nagata, J.Morioka and Y.Maeda: "Deodorization of Odorous compounds by Ultrasonic Irradiation." J.Odor Research and Eng.27 (3). 143-149 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Takenaka: "Chemical Reactions Accelerated by Freezing" J.Jpn.Soc.Cold Preservation of Food. 21 (3). 143-151 (1995)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-16  

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