室内実験における石灰岩の溶解特性に関する一考察  [in Japanese] Dissolution Characteristics of Limestone in Laboratory Experiments  [in Japanese]

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Author(s)

    • 高屋 康彦 TAKAYA Yasuhiko
    • 筑波大学大学院生命環境科学研究科地球環境科学 Geoenvironmental Sciences, Graduate School of Life and Environmental Sciences, University of Tsukuba
    • 廣瀬 孝 HIROSE Takashi
    • 琉球大学法文学部人間科学科 Department of Geography, Faculty of Law and Letters, University of the Ryukyus
    • 青木 久 [他] AOKI Hisashi
    • 琉球大学大学院理工学研究科21世紀COEプログラム The 21st Century COE Program, Graduate School of Engineering and Science, University of the Ryukyus
    • 松倉 公憲 MATSUKURA Yukinori
    • 筑波大学大学院生命環境科学研究科地球環境科学 Geoenvironmental Sciences, Graduate School of Life and Environmental Sciences, University of Tsukuba

Abstract

The results of three laboratory experiments in a batch (closed) system were reexamined to elucidate the influence of some factors related to the dissolution characteristics of limestone;Experiment A : an experiment in which the samples (200 g in weight) crushed to fragments with three kinds of grain size (coarse : a diameter of 45-32 mm; medium : 16-8 mm; and fine : 2-1 mm) were treated with distilled water under various solid/liquid ratios (0.25, 0.5, and 1) over 960 hrs (40 days); Experiment B : an experiment in which clay-size powder sample (1.00 g in weight) or a block sample (3.54×3.54×20 mm<SUP>3</SUP>) was treated with distilled water (50.0 mL) over 417 hrs (ca. 17 days); Experiment C : an experiment in which a block sample (5.0×5.0×40.0 mm<SUP>3</SUP>) was treated with distilled water (250.0 mL) at various temperatures (5, 50, and 75°C) over 2164 hrs (ca. 90 days). Electric conductivity (EC) of aqueous solution, as an index of solute concentration, was measured.<BR>Experimental results showed that (1) surface area of crushed samples and temperature influence the dissolution rate less than solid/liquid ratio, (2) the dissolution rates at the initial stage of reaction are influenced by both physical property of rock (porosity) and water temperature, and (3) the rate-determining step at the initial stage is a mass transport process (e.g., diffusion of ions in solution). Therefore, it is necessary for the continuous dissolution of limestone to prompt the transport of dissolved materials. In other words, a condition for it is to send water undersaturated with respect to carbonate minerals into the rock surface by stirring a solution in a batch (closed) system experiment.

Journal

  • Journal of Geography (Chigaku Zasshi)

    Journal of Geography (Chigaku Zasshi) 115(2), 136-148, 2006-04-25

    Tokyo Geographical Society

References:  27

Cited by:  4

Codes

  • NII Article ID (NAID)
    10020539444
  • NII NACSIS-CAT ID (NCID)
    AN00322536
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0022135X
  • NDL Article ID
    8053083
  • NDL Source Classification
    ZM41(科学技術--地球科学)
  • NDL Call No.
    Z15-169
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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