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 33, Issue 3
Displaying 1-7 of 7 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1979 Volume 33 Issue 3 Pages 143-153
    Published: 1979
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.33.143
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1979 Volume 33 Issue 3 Pages 154-164
    Published: 1979
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.33.154
    JOURNAL FREE ACCESS
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  • Improvement of Water Quality in Distillation Process
    Behavior of Ammonia and Hydrogen Cyanide by Complex Formation
    Kazumi NOBUTA
    1979 Volume 33 Issue 3 Pages 165-171
    Published: 1979
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.33.165
    JOURNAL FREE ACCESS
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    In sea water distillation methods, the prevention of ammonia has come into critical problembecause of its evaporation.
    The purpose of this work is to evaluate the formation of ammine metal complexes by adding asmall amount and a few kinds of heavy-metal salts such as iron, chromium to the aqueous solutioncontaining ammonia and to check up on the prevention effect on distillation of ammonia.
    Similary, distillation of hydrogen cyanide is conducted.
    From these studies, it is found that the controlling effects for distillation of ammonia or hydrogencyanide by adding metal salts are considerably dependent on pH, salinity and the decomposition of these complexes by heating the solution and further kinds of metal species and/or its concentration.
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  • The Influence of Fouling of Heat Transfer Tubes on Performance Ratio in Multi-Stage Flash Evaporators
    Kenkichi IZUMI, Akira YAMADA, Sankichi TAKAHASHI, Yoshihiro IKENAGA
    1979 Volume 33 Issue 3 Pages 172-179
    Published: 1979
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.33.172
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    The relationship between the performance ratio and the overall heat transfer coefficients of thecondensers in a multi-stage flash evaporator was investigated theoretically and experimentally. Asimplified equation between the performance ratio and the overall heat transfer coefficient wasobtained by the approximate calculation of the theoretical heat and mass balance of the evaporator.
    The experimental tests were carried out using a 100m3/d, 10-stage plant and a 1 m3/d, 5-stageplant. The performance ratio and the overall heat transfer coefficient of each plant were examinedat the operations with and without polyphosphate additive for scale prevention. The experimental data on the performance ratio and the overall heat transfer coefficient werecompared with the values calculated using the simplified equation. The experimental data of theperformance ratio agreed well with the calculated values before the heat transfer tubes of thecondensers in the plants were extremely fouled by the deposition of scales and sludges. From theresults of the experiments, it was cleared that the simplified equation was capable of applicationto the commercial plants. The fouling factors of the tubes are given using the overall heat transfercoefficients calculated from the experimental data of the performance ratio by the simplified equation, and the conditions of the tube cleaning are estimated.
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  • The Determination of Molybdenum in Sea Water by Atomic Absorption Spectrophotometric Method with BMPP-iso-amyl Alcohol Extraction
    Yoshifumi AKAMA, Toshio NAKAI, Fumikazu KAWAMURA
    1979 Volume 33 Issue 3 Pages 180-183
    Published: 1979
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.33.180
    JOURNAL FREE ACCESS
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    A trace of molybdenum in sea water is determined by atomic absorption spectrophotometryusing solvent extraction. Molybdenum (VI) is complexed with 4-benzoy1-3-methy1-1-pheny1-5-pyrazolone (BMPP) and extracted into iso-amyl alcohol. To find the optimum condition for theextraction of molybdenum, experiments are tried on the effects of pH, concentration of BMPP, and interference of divers ions.
    It is shown that extraction is complete in the pH range 1.0-3.0 at 0.2w/v% BMPP concentrationand that Na, K, Sr, Ca and Mg at high concentration have no effects on the extraction butin excess of 2mg Fe (III), Cr (VI), and V (V) depress the absorbance of molybdenum makedly, probably because of complex formation or preferential extraction.
    One liter of sea water in which 10ml of concentrated hydrochloric acid is added is concentratedto 200ml by heating and then filtered using Toyo Roshi No.3 filter paper. The solution adjustedto pH 2.5 by the addition of sodium acetate is placed in a separatory funnel, and then extractedwith 10ml of 0.2w/v% solution of BMPP in iso-amyl alcohol by shaking for 10min.
    It is found out that the sea water samples contain 7-11μg Mo/liter and the results are agreed well with those that have previously been published.
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  • Measurement Technology of Tubiditv in Sea Water
    Yuichi KUNISADA
    1979 Volume 33 Issue 3 Pages 184-189
    Published: 1979
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.33.184
    JOURNAL FREE ACCESS
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  • International Standardization of Food Grade Salt-Its Process and Current Situation
    Kozo OKA
    1979 Volume 33 Issue 3 Pages 190-196
    Published: 1979
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.33.190
    JOURNAL FREE ACCESS
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