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 70, Issue 6
Displaying 1-10 of 10 articles from this issue
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Greeting
Special Issue : “A Study of the Seawater of West Japan (6)”
Commentary
Original Paper
  • Determination of the Composition and Strontium-Binding Ratio of Sodium Titanate Impregnated onto DMAPAA-Grafted Fiber
    Shoko NARUKE, Shun-ichi GOTO, Mizuki KATAGIRI, Kunio FUJIWARA, Takanob ...
    2016 Volume 70 Issue 6 Pages 364-368
    Published: 2016
    Released on J-STAGE: September 27, 2017
    DOIhttps://doi.org/10.11457/swsj.70.6_364
    JOURNAL FREE ACCESS
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    Sodium titanate was impregnated onto a 6-nylon fiber by means of radiation-induced graft polymerization of dimethylaminopropyl acrylamide （DMAPAA） and subsequent chemical modifications. Peroxotitanium complex anions were bound to the DMAPAA-grafted fiber, followed by a reaction with sodium hydroxide to form sodium titanate as precipitate on the fiber. A quantitative elution of sodium titanate impregnated onto the fiber with 1 M nitric acid revealed that the molar ratio of Na to Ti was 0.76, which was almost consistent with that of sodium titanate （Na4Ti5O12） produced in a homogeneous system. During the immersion of sodium titanate-impregnated fiber in a mixture of 0.5 M NaCl and 0.05 M SrCl2, a molar ion-exchange ratio of Sr with Na was determined as being 0.55 by a quantitative elution of Sr-containing precipitate on the fiber.
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Short Paper
  • Preparation of Cation-exchange Membranes from Polylsulfone with Poly （sodium p-styrenesulfonate） Graft Chains
    Yuriko KAKIHANA, Kouhei UKAI, Mitsuru HIGA
    2016 Volume 70 Issue 6 Pages 369-370
    Published: 2016
    Released on J-STAGE: September 27, 2017
    DOIhttps://doi.org/10.11457/swsj.70.6_369
    JOURNAL FREE ACCESS
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    Cation-exchange membranes （CEMs） were prepared from polysulfone （PSF）-based graft copolymers with graft chains of poly（sodium styrene sulfonate）. The graft-copolymers were synthesized by grafting ethyl p-styrenesulfonate （EtSS） on macro-initiators of chloromethylated PSF with different chloromethyl （CM） groups, thus changing the EtSS content in the polymers by using atom transfer radical polymerization. The transport number of the CEM （CM content ＝ 8.4 mol ％, and EtSS ratio ＝ 46 wt.％） was 0.98, almost the same as that of a commercial CEM, Neosepta® CMX （ASTOM Corp., Japan）, 0.98. The membrane resistance of the PSF-based CEM was 2.3 Ω・cm2, and lower than that of CMX, 3.0 Ω・cm2.
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Note
  • Continuous Automatic Determination of Ferrocyanide Ion in Salt by Flow Injection Analysis （FIA）
    Akihiro KOGA, Yasushi NODA, Takeshi YAMANE
    2016 Volume 70 Issue 6 Pages 371-375
    Published: 2016
    Released on J-STAGE: September 27, 2017
    DOIhttps://doi.org/10.11457/swsj.70.6_371
    JOURNAL FREE ACCESS
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    A flow injection analysis （FIA） method is presented as a means of reducing the workload required to determine hexacyanoferrate （II） （ferrocyanide） in salt. This method is based on the detection reaction of adsorbed ferrocyanide to Fe （III） complex with 1,10-phenanthroline. Automated analytical systems have been developed in which the sample injection and change of the flow path are automated. In addition, we investigated the appropriate concentration and pH of the sample solution, as well as the influence of the ferroin concentration. As a result, the FIA method described in this paper successfully determined the ferrocyanide ion in commercial salt.
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