Bulletin of the Society of Sea Water Science, Japan
Online ISSN : 2185-9213
Print ISSN : 0369-4550
ISSN-L : 0369-4550
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Volume 40, Issue 2
Displaying 1-5 of 5 articles from this issue
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  • Application of Flash Evaporation Technology
    Osamu MIYATAKE
    1986 Volume 40 Issue 2 Pages 78-94
    Published: 1986
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.40.78
    JOURNAL FREE ACCESS
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  • Concentration of Uranium in Seawater by Flotation
    Toru NOZAKI, Hiroshi YAMASHITA
    1986 Volume 40 Issue 2 Pages 95-99
    Published: 1986
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.40.95
    JOURNAL FREE ACCESS
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    A method has been developed for the concentration of uranium in seawater by precipitation flotation-carbonate extraction-ion flotation. Uranium in seawater was coprecipitated with hydrated iron (III) oxide by adjusting the pH to 5.5 after addition of 1.0×10-3mol/l of iron (III) and agitating for 1hr, and the precipitate was floated with 1.0×10-5mol/l of sodium oleate and 5.0×10-5mol/l of sodium lauryl sulfate by bubbling nitrogen through the seawater for 15min. Uranium was extracted from the precipitate scum at the yield of 89% with 100ml of 1.8% of ammonium carbonate solution by agitating for 2hr, and floated with 1.2×10-3mol/l of cetylpyridinium chloride by bubbling nitrogen through the extract diluted 5-fold for 30 min in the recovery of about 100%. The fairly selective recovery of uranium was obtained from 4l of seawater at the yield of 87% throughout the entire process.
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  • Graphite Furnace Atomic Absorption Spectrometry of Copperin Sea Water by Using Coprecipitation Concentration Method
    Studies on the Environmental Analysis (Part 23)
    Hiroshi NISHIOKA, Yoshimichi MAEDA, Takatugu AZUMI
    1986 Volume 40 Issue 2 Pages 100-104
    Published: 1986
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.40.100
    JOURNAL FREE ACCESS
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    Determination of copper in sea water was studied by graphite furnace atomic absorption spectrometry (GFAAS). Cu (II) ions were preconcentrated by a precipitation methodusing Al (III) ions and sodium diethyldithiocarbamate (DDTC) at pH7. The precipitate containing copper was collected on a melnbrane filter paper, and then dissolved with 30ml of HNO3(1+12), followed by evaporation to drylless. The sample solution for GFAAS was obtained by redissolving the evaporation residue ith 10ml of HNO3(1+12). It was possible to determine Cu (II) ions without any interfering effects of the copresence ions in sea water. The limit of detection and the limit of determination were 0.7μg/l, 2.4μg/l, respectively. This method was satisfactorily applied to the determination of Cu (II) ions in sea water.
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  • Behavior of Bromine in the Process of Salt-Making
    Hitomi NISHIMURA, Kiyomi SOGA, Shizuo SUGITA
    1986 Volume 40 Issue 2 Pages 105-110
    Published: 1986
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.40.105
    JOURNAL FREE ACCESS
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    The content of bromine in foodstuff has become a serious problem recently. Weinvestigated the behavior of bromine in the process of salt-making and the equilibrium of bromide ion in heterogeneous system at 75°C was studied. Then, we determined bromide ion and bromate ion in kitchen-salt. The following results were obtained:
    1. The concentration of bromide ion in brine and the permselectivity of bromide ion against chloride ion with a new type of ion exchange membrane were slightly increased in comparison with an old type of ion exchange membrane.
    2. In the process of concentration the deposition of bromide ion was observed before the deposition of potassium ion. Bromide ion was estimated to exist in the crystal of sodium chloride.
    3. The equilibrium of Na+, K+, Mg2+, Ca2+, Cl-, Br--H2O at 75°C was determined, and the resuit indicated that it was unsaturated yet in the case of ordinary concentration of bromide ion in mother liquor (about 1%).
    4. The conteats of bromide ion and bromate ion in the kitchen-salts of seven salt-making companies were determined by the modified Kolthoff-Yutzy method. Only bromide ion was contained in all kitchen-salts, and its concentration was 400-700mg/kg. These values were not of a serious problem for food sanitation.
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  • Recent Advances in Ion Exchange Membrane
    Tatsuro ASAWA, Toshikatsu SATA, Tetsuro TANAKA, Yoshinobu TANAKA
    1986 Volume 40 Issue 2 Pages 111-123
    Published: 1986
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.40.111
    JOURNAL FREE ACCESS
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