All issues
Volume 16 (1982)
- Issue 2 Pages 43-
- Issue 1 Pages 1-
Volume 16, Issue 1
Displaying 1-6 of 6 articles from this issue
- |<
- <
- 1
- >
- >|
-
Yasushi KITANO1982 Volume 16 Issue 1 Pages i-v
Published: November 30, 1982
Released on J-STAGE: November 20, 2016
JOURNAL FREE ACCESSDownload PDF (804K)
Original Papers
-
Yoshiihro HIRABAYASHI, Kei KAJITANI1982 Volume 16 Issue 1 Pages 1-8
Published: November 30, 1982
Released on J-STAGE: November 20, 2016
JOURNAL FREE ACCESSIn order to explain the role of humic acid in the behavior of metal ions in aqueous environments, such as rivers and estuaries, portions of Zn, Cd and Ni combined with humic acid in dilute aqueous solutions were determined using ultrafiltration. The portions of these ions combined with humic acid increase with pH, and decrease with concentration of NaCl in solution. In solution containing less than 50 ppm NaCl, Cd is distinguished in portions of ions linked to humic acid from Zn and Ni, while the combination of Cd with humic acid is most remarkably influenced by NaCl. Some trace metals can be removed from the aqueous phase during the coagulation process of humic acid. When river water is mixed with sea water, the combination of humic acid and the metal ions such as Zn++, Cd++ and Ni++ is responsible for the removal of these ions only when the concentration of humic acid is high.View full abstractDownload PDF (784K) -
Kazuo FUKUSHIMA, Shuichi YAMAMOTO, Minoru UZAKI, Ryoshi ISHIWATARI1982 Volume 16 Issue 1 Pages 9-16
Published: November 30, 1982
Released on J-STAGE: November 20, 2016
JOURNAL FREE ACCESSAn aqueous microbial decomposition experiment of a freshwater water weed (Hydrilla Verticillata, Presl.) was conducted, whereby changes in organic compositions from live to degraded plant materials after 1 and 2 years' incubation were investigated. Organic constituents, e.g., lipids (hydrocarbons, fatty acids and phytol), amino acids, carbohydrates and cellulose were determined by use of a gas-liquid chromatography. The decrease in the total organic matter after 1 and 2 year's incubation were estimated to be 39% and 32% respectively. Carbohydrates and cellulose decreased most significantly. Relative compositions of amino acids changed little, wheras those of fatty acids and carbohydrates changed in certain tendencies which might explicate the observations in nature. Those analyzable organic constituents decreased as decomposition proceeded and the unanalyzable lignin and/or humic materials comprised more than 75% of the organic matter in the plant residue of 2 years' decomposition.View full abstractDownload PDF (836K) -
Yasuhiro KIYOSU, Makoto KURAHASHI1982 Volume 16 Issue 1 Pages 17-24
Published: November 30, 1982
Released on J-STAGE: November 20, 2016
JOURNAL FREE ACCESSD/H, 18O/16O and 34S/32S ratios of acid hot spring waters and fumarolic gases around Kusatsu-shirane volcano were determined together with chemical components. From the chemical compositions acid hot spring waters were classified into acid chloride-sulfate type at Kusatsu and Manza, and acid sulfate type at Shirane kitagawa. The δ34S value of sulfate in acid chloride-sulfate type waters is much heavier than in acid sulfate type. The thermal water at Kusatsu is considered to be mixtures of isotopically heavy and light sulfate. Although the two types of acid hot water are slightly enriched in D and 18O compared to the respective local meteoric water, the thermal waters are essentially meteoric in origin. The stable isotopic evidences of acid hot springs and fumaroles suggest that the net-sulfur in acid chloride-sulfate type has δ34S value around 0‰.View full abstractDownload PDF (766K) -
Masami ICHIKUNI, Reiko SUZUKI, Makoto TSURUMI1982 Volume 16 Issue 1 Pages 25-29
Published: November 30, 1982
Released on J-STAGE: November 20, 2016
JOURNAL FREE ACCESSThis paper describes the chemistry of alkaline spring waters from the Abukuma mountain area, Fukushima Prefecture. The waters are formed by reaction of rainwater with felsic rocks under a limited CO2 supply. The data are plotted on a log (aCa2+/a2H+)-logaSiO2 diagram (Fig. 1). Most of samples are located in a small area on the diagram. The waters having a pH higher than 9 are shown to be saturated with respect to calcite, thus suggesting that the alkaline waters represent an equilibrium product of water-felsic rock interaction. Assuming that the waters are in equilibrium with kaolinite-Ca-montmorillonite assemblage, the equilibrium constant for reaction (1) (see text) is estimated to be -11 as pK. However the chemistry of these waters cannot be fully explained by the system kaolinite-Ca-montmorillonite-aqueous solution. An additional Ca mineral, possibly Ca-zeolite, should be included in the system.View full abstractDownload PDF (501K)
Review
-
Yoko YOKOUCHI, Yoshinari AMBE1982 Volume 16 Issue 1 Pages 30-41
Published: November 30, 1982
Released on J-STAGE: November 20, 2016
JOURNAL FREE ACCESSTerpenoids are known to be emitted from various kinds of plants into the atmosphere. Their global production rate is estimated 1.75×108〜4.3×109 tons/yr. Terpenoids react rapidly with hydroxyl radicals as well as with ozone. Through the chemical reactions and gas-to-particle transformation, terpenoids are expected to result in aerosols surrounding forests. In this review, their emission rate, their concentration in the atmosphere, their reactivities and their impact on air quality are discussed. It is concluded that more reliable emission measurements and more systematic observations of atmospheric terpenoids and their products are inevitable to understand the impact of terpenoids on air quality.View full abstractDownload PDF (1108K)
- |<
- <
- 1
- >
- >|