Journal of Environmental Conservation Engineering
Online ISSN : 1882-8590
Print ISSN : 0388-9459
ISSN-L : 0388-9459
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Volume 39, Issue 4
Displaying 1-3 of 3 articles from this issue
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  • Adsorption Characteristics of Heavy Metals to Humic Acid
    Mukedes ABDURISHIT, Yoshinori KANJO, Satoshi MIZUTANI
    2010 Volume 39 Issue 4 Pages 222-228
    Published: April 20, 2010
    Released on J-STAGE: October 03, 2011
    DOIhttps://doi.org/10.5956/jriet.39.222
    JOURNAL FREE ACCESS
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    Humic acid, which is widely distributed in the soil and natural water, has high complexation ability with various kinds of heavy metals, and creates a strong effect on the mobility and solubility of heavy metals. In this paper, the adsorption characteristics of heavy metals to humic acids, which were extracted from different soils based on the extraction method of International Humic Substance Society, were compared with the results of molecular weight distributions of heavy metals absorbed to humic acid with gel filtration chromatography. Judging from the results, lead was detected at the same points to the humic acid, and Zinc was absorbed to organic matter with molecular weight greater than 100,000. However, copper was absorbed to wide range of humic acid. In addition, it was observed that the absorbed amounts of heavy metals were correlated with the amounts of functional groups of humic acids.
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  • The Systematization and the Effective Evaluation of Countermeasure Methods for Construction Vibration in Soft Ground
    Shigeyuki FUJIMORI, Takatomo ARAKI, Takaharu KAWAI, Kiyoshi HAYAKAWA
    2010 Volume 39 Issue 4 Pages 229-237
    Published: April 20, 2010
    Released on J-STAGE: October 03, 2011
    DOIhttps://doi.org/10.5956/jriet.39.229
    JOURNAL FREE ACCESS
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    In the Kadoma area of the Second Keihan Road, the alluvium layer of ground is thick and the surface layer is extremely soft. For the construction on site, the authors carried out various countermeasure methods for vibration, specifically a construction method with minimal impact upon establishment of a manageable vibration level. A vibration impact inspection conference consisting of professors, experts, project owners and builders was also organized. This study reports on the countermeasure method for construction vibration on soft ground and the vibration level at a second construction site, and the effect of the countermeasure method on vibration, utilizing a continuous underground wall. In addition, regarding the effective evaluation of countermeasure methods on vibration for the benefit of local citizens, the results of the full implementation of countermeasure methods for vibrations indicated that communication with local residents is highly effective. An informative diagram of the vibration environment and a database of construction vibration results were created to explain the countermeasure process. The results indicated that it is important to effectively utilize both analog and digital information under the right circumstances.
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