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 69, Issue 2
Displaying 1-11 of 11 articles from this issue
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Greeting
Special Issue :“Towards Construction of Resource Development Technology that Takes into Consideration Environmental Protection”
Commentary
Original Paper
  • Preparation of Adsorptive Fiber by a Combination of Peroxo Complex of Titanium Anion and DMAPAA-Grafted Fiber for the Removal of Strontium from Seawater
    Michitaka KONO, Satoshi UMINO, Shun-ichi GOTO, Kunio FUJIWARA, Takanob ...
    2015 Volume 69 Issue 2 Pages 90-97
    Published: 2015
    Released on J-STAGE: September 26, 2016
    DOIhttps://doi.org/10.11457/swsj.69.90
    JOURNAL FREE ACCESS
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    In order to remove strontium from seawater, sodium titanate was impregnated onto a commercially available 6-nylon fiber by means of radiation-induced graft polymerization and subsequent chemical modifications. First, dimethyaminopropyl acrylamide as an originally anion-exchange-group-containing vinyl monomer was graft-polymerized onto the electron-beam-irradiated nylon fiber, followed by binding of a peroxo complex of titanium anions to the anion-exchange group of the graft chain. Then, bound titanium species were converted into insoluble sodium titanate through a reaction with sodium hydroxide. The equilibrium binding capacity of the sodium-titanate-impregnated fiber for strontium in seawater was calculated as 1.7 mg/g-Sr of the fiber from Langmuir adsorption isotherm.
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  • Ruthenium Removal from Water Using Nucleic-Acid Base-Immobilized Fibers
    Taka-aki SASAKI, Kunio FUJIWARA, Takanobu SUGO, Shigeko KAWAI-NOMA, Da ...
    2015 Volume 69 Issue 2 Pages 98-104
    Published: 2015
    Released on J-STAGE: September 26, 2016
    DOIhttps://doi.org/10.11457/swsj.69.98
    JOURNAL FREE ACCESS
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    To enhance the removal rate of ruthenium from water, nucleic-acid base-immobilized fibers as adsorbent were prepared by means of radiation-induced graft polymerization of glycidyl methacrylate and the subsequent addition of nucleic-acid bases. The density of adenine immobilized onto 6-nylon fiber was 1.2 mmol/g. Ther removal rate of ruthenium increased with an increase in sodium chloride concentration in the ruthenium solution. The removal rate was represented by second-order reaction with respect to ruthenium concentration. The dependence of the initial removal rate of ruthenium from the solution on the temperature demonstrated that the activation energy of overall adsorption of ruthenium onto adenine-immobilized fiber was 45 kJ/mol, irrespective of the sodium chloride concentration ranging from 0.025 to 0.5 M.
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  • Effects of Bittern Components on the Taste of Salts
    Yuka ENDO, Kyoko ISHIKAWA
    2015 Volume 69 Issue 2 Pages 105-110
    Published: 2015
    Released on J-STAGE: September 26, 2016
    DOIhttps://doi.org/10.11457/swsj.69.105
    JOURNAL FREE ACCESS
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    The effects of bittern components on salt taste were assessed using sensory evaluation and taste sensors. Sensory tests detected the addition of potassium chloride and sodium sulfate at 0.08 ％ in 0.8 ％ of a sodium chloride solution. The salt solution taste became deeper concomitantly with the added quantity of those bittern components. Results show that magnesium sulfate at 0.04 ％ and magnesium chloride at 0.16 ％ in 0.8 ％ sodium chloride solution affected the taste. Bittern compounds decreased saltiness in accordance with the quantity of their addition. Taste sensor measurement results showed different response patterns for bitterness of magnesium sulfate and magnesium chloride from those of other solutions. These results suggest that bittern component variety and quantity affect the salt taste.
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  • Concentration Characteristics of Latex Particles by Forward Osmosis Process
    Tomoki TAKAHASHI, Masahiro YASUKAWA, Hideto MATSUYAMA
    2015 Volume 69 Issue 2 Pages 111-117
    Published: 2015
    Released on J-STAGE: September 26, 2016
    DOIhttps://doi.org/10.11457/swsj.69.111
    JOURNAL FREE ACCESS
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    In this study, the low energy membrane concentration process of PVC latex particles was investigated by means of forward osmosis process. The detailed investigation revealed that concentration behavior of latex particles strongly depended on the flow condition of latex and the shear stress on the membrane. Moreover, the effects of FO membrane species and membrane orientation facing the latex solution on concentration behavior of latex particles were examined. In addition, the concentration behavior of a surfactant（SDS）aqueous solution was compared with the PVC latex solution. The concentration polarization of SDS into a support layer of the FO membrane played an important role for concentration of latex particles. This work showed high concentration of more than 65 wt％ of latex particles while maintaining surfactant was possible by means of FO process using seawater.
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Short Paper
Relay Essay (12)
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