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 43, Issue 4
Displaying 1-6 of 6 articles from this issue
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  • Production of Heavy Water and Concentration of Heavy Water in Seawater Distillation Process
    Yuji SHINDO, Toshikatsu HAKUTA
    1989 Volume 43 Issue 4 Pages 191-199
    Published: 1989
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.43.191
    JOURNAL FREE ACCESS
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  • Electrochemical Method
    Various Chemical Sensors
    Akira FUJISHIMA
    1989 Volume 43 Issue 4 Pages 200-207
    Published: 1989
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.43.200
    JOURNAL FREE ACCESS
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  • Graphite Furnace Atomic Absorption Spectrometry of Trace Amount of Molybdenum in Sea Water
    Studies on Environmental Analysis (Part 45)
    Futoshi SUGIMOTO, Akihiro KIMURA, Yoshimichi MAEDA, Takatugu AZUMI
    1989 Volume 43 Issue 4 Pages 208-211
    Published: 1989
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.43.208
    JOURNAL FREE ACCESS
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    Determination of molybdenum in sea water was studied by graphite furnace atomic absorption spectrometry (GFAAS).
    Molybdenum ions were preconcentrated by a coprecipitation using Fe(III) and sodium diethyldithiocarbamate (DDTC) at pH 3. Molybdenum was selectively dissolved from the coprecipitate with 30 ml of hydrogen peroxide (3.0%) by heating on a hot plate. The solution was made up to 100 ml with distilled water, and was used as the sample solution for GFAAS.
    The linear range of calibration curve was from 2 to 20μg/l, and the detection limit for molybdenum was 0.5μg/l, the lower limit of determination was 1.7μg/l in the case of using 500 ml of sample water.
    Molybdenum concentration of sea water was determined by calibration curve method to be 9.8μg/l, which was in agreement with the value (10.2μg/l) by standard addition method. The relative standard deviation in respective five determinations of sea water was 2.3%.
    This method was satisfactorily applied to the determination of molybdenum in sea water.
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  • Determination of Total Phosphorus in Environmental Water by Fluorescent X-Ray Analysis
    Studies on Environmental Analysis (Part 46)
    Hiroki IWAYA, Yoshimichi MAEDA, Takatugu AZUMI
    1989 Volume 43 Issue 4 Pages 212-217
    Published: 1989
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.43.212
    JOURNAL FREE ACCESS
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    Determination of total phosphorus in environmental water was investigated by fluorescent X-ray analysis.
    A 3.0 mg portion of Fe (III) was added to sample water, the pH of which was then adjusted to 5.0 so as to precipitate inorganic phosphate and organic phosphate. This precipitate was once gathered onto a membrane filter and dissolved with 10 ml of (1+5) H2SO4-.
    The solution was made up to about 100 ml with distilled water and its pH was again adjusted to 5.0. The resulting precipitate was collected onto membrane filter and the FX-intensity of phosphorus was measured.
    It was possible to determine trace amount of total phosphorus in environmental water without any interfering effects of the copresent salts and sample volume.
    The detection limit for phophate concentration was 1.2 μg/l and the lower limit of determination was 4.0 μg/l in the case of using 500 ml of sample water.
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  • Basic Study on Compaction of Reverse Osmosis Membrane
    Naohiko UKAWA, Ikuo NAKATANI, Hideo IWAHASHI
    1989 Volume 43 Issue 4 Pages 218-224
    Published: 1989
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.43.218
    JOURNAL FREE ACCESS
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    It is well known that reverse osmosis (RO) membranes exhibit a decline in water flux during operation at a high pressure because the membranes become compacted.
    The RO membranes at RO desalination plants are usually operated at a high pressure. Therefore, the designer of these plants is required to predict precisely a flux decline, taking into account the effect of the compaction of the membranes during operation. For stable operation of the RO plants, it is also important to know the behavior of relaxation of the compacted membranes during shutdown.
    In this study, the declining tendency of pure water permeability coefficient (A-value) was experimentally examined using cellulose triacetate hollow fiber membranes. As a result, the dependency of the A-value on the feed pressure was clarified. It was also found that the A-value was restored when it was preserved at an atmospheric pressure and the restoration depended on such factors as a period of preservation, a degree of the compaction of membranes before preservation.
    The experimental data were compared with the predicted values obtained by calculation using a newly presented viscoelastic model. The tendency of A-value variations was successfully described by the viscoelastic model.
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  • Exergy Balance and Its Application to Salt Manufacturing
    Leo EHARA
    1989 Volume 43 Issue 4 Pages 225-233
    Published: 1989
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.43.225
    JOURNAL FREE ACCESS
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