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Volume 19 (1979)
- Issue 4 Pages 103-
- Issue 3 Pages 73-
- Issue 2 Pages 41-
- Issue 1 Pages 1-
Volume 19, Issue 4
Displaying 1-3 of 3 articles from this issue
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Daizo KITA, Hirokazu TSUJI, Hiroshi KUBO1979 Volume 19 Issue 4 Pages 103-115
Published: December 25, 1979
Released on J-STAGE: September 20, 2011
JOURNAL FREE ACCESSA lot of bottom sediments called “Hedoro” has accumulated in public water basins such as harbours, rivers and lakes. These bottom sediments “Hedoro” contain the organic matters or the toxic substances originated from waste water of industry or living. Therefore, the bottom sediments “Hedoro” are required to be excluded in order to clean up and to preserve the environment.
This paper deals with the physical, chemical and engineering properties of the bottom sediments “Hedoro” and the techniques for the dredging, the clarification of surplus water and management of the dredged bottom sediments.View full abstractDownload PDF (6639K) -
Effect of Cation Exchange TreatmentMakoto ASAKA, Masami HOTTA, Kazuo TORII1979 Volume 19 Issue 4 Pages 115-122
Published: December 25, 1979
Released on J-STAGE: September 20, 2011
JOURNAL FREE ACCESSThe effect of cation exchange treatment on some physico-chemical properties of mordenite tuff was investigated by X-ray powder diffraction, chemical analyses, thermal analyses and gaschromatography. Mordenite tuff from Shirasawa, Miyagi-cho, Miyagi Pref., Japan was used as a starting material, from which Na-, K-, Ca-, NH4-and Hmordenite were prepared by cation exchange treatment.
It was recognized that Na in the mordenite tuff was easily exchanged by other cations, however K was not exchanged easily, at the mild condition. The cation ratios of Na, K, Ca and NH4 for Na-, K-, Ca-and NH4-mordenite were 78, 94, 49 and 63 mole%, respectively.
The X-ray diffraction peak intensities of mordenite were affected by cation exchange and consequently the slight differences among the X-ray diffraction patterns for different cation exchanged mordenite were observed. The intensities of the main peak, mordenite (202) plane, relative to that (=100) of the original tuff, were 101, 78, 84, 106 and 105 for Na-, K-, Ca-, NH4-and H-mordenite respectively.
The following sequence of thermal stability was found by DTA method in the cation exchanged mordenite: NH4->H->K->Na> original tuff>Ca-mordenite.
Separations of hydrogen (or helum), argon, oxygen, nitrogen, krypton, methane and carbon monoxide were investigated using cation exchanged mordenite as column packings. Hydrogen (and/or helium), oxygen (and/or argon), nitrogen, krypton, methane and carbon monoxide were completely separated on the original tuff and Na-mordenite columns, but nitrogen, krypton and methane were eluted with overlap on the Ca-mordenite column. Methane and carbon monoxide were overlapped on the both NH4-and K-mordenite columns. The values of the separation factor for nitrogen over oxygen, α, on NH4-, H-and K-mordenite were 1.6, 1.8 and 2. 1, and were much smaller than those on original tuff (α=4.5), Na-(α=4.8) and Ca-mordenite (α=4.2) activated at 350°C.View full abstractDownload PDF (968K) -
Katsuhiro INOUE, Minoru YOSHIDA1979 Volume 19 Issue 4 Pages 123-131
Published: December 25, 1979
Released on J-STAGE: September 20, 2011
JOURNAL FREE ACCESSThe Towada Lake and the Oirase Valley are the famous picturesque places belonging to the Towada-Hachimantai National Park in Japan. The area along the Oirase and its tributary waters is covered with the so-called “Towada-Shirasu”, which consists of the Holocene tephras, non-welded pumice flow deposits, and tuffs.
The suspended loads in the Oirase and its tributary waters were the fine grained pumice, the silty to clayey volcanic ash, and the fragments of rotted leaves. They were responsible for the water turbidness of the Oirase River. The medium to coarse grained pumices were dominant in the bed loads. Both loads contained augite, hypersthene, magnetite, and small amounts of hornblende as heavy minerals. Montmorillonite was the dominant clay mineral in the suspended loads. These minerals were estimated to derive from the collapsed materials of the “Towada-Shirasu”, especially the Hachinohe Pumice Flow deposits and its underlying tuffs. The water turbidness of the Oirase River is directly concerned with the collapsed materials of the “Towada-Shirasu”.
In addition to the geological and geomorphological characteristics (Shirasu and the stage of youth), artificial factors such as a lumbering of trees and/or a grassland reclamation may promote the water turbidness of the Oirase River.View full abstractDownload PDF (1240K)
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