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 71, Issue 5
Displaying 1-12 of 12 articles from this issue
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Preface
Special Issue : “Analytical Chemistry to Contribute to the Advancement of Seawater Science and Seawater-related Industrial Development”
Review
Original Paper
  • Applicability of InertSep ME-2 to Solid-Phase Extraction of Trace Elements
    Shigehiro KAGAYA, Yukari AOKI, Yumi SAEKI, Taro GOTO, Mayu OHKI, Issei ...
    2017 Volume 71 Issue 5 Pages 282-290
    Published: 2017
    Released on J-STAGE: September 29, 2018
    DOIhttps://doi.org/10.11457/swsj.71.5_282
    JOURNAL FREE ACCESS
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    The potential of a chelating resin, InertSep ME-2, on which both iminodiacetic acid（IDA）and amine are immobilized independently, was investigated. The solid-phase extraction behavior for 21 elements using InertSep ME-2 was similar to those using Nobias Chelate PA-1, Presep PolyChelate, and a chelating resin immobilizing carboxymethylated polyethylenimine; Mg, Ca, and Sr were scarcely extracted under acidic and neutral conditions, and other elements, including Cd, Co, Cu, Fe, Mo, Ni, Pb, V, and Zn, were quantitatively recovered over a wide pH range. Such selectivity would be due to the presence of both the IDA group for the extraction of elements and the protonated amino group for the electrostatic repulsion. A significant change in extraction percentages was not observed at a flow rate of at least 30 mL/min. This could be partly due to the use of a highly cross-linked, macroporous, hydrophilic methacrylate resin as the base polymer. InertSep ME-2 was applicable to the separation of the elements in artificial seawater and some certified reference materials, EnviroMAT Ground Water ES-L-1 and Waste Water EU-L-3.
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Note
Short Paper
  • Capillary Zone Electrophoresis Used to Identify Metal Ions in the Common Ice Plant（Mesembryanthemum crystallinum L.）
    Yuichiro HIDAKA, Shota HASHIMOTO, Keiichi FUKUSHI, Jun-ichi TSUJIMOTO, ...
    2017 Volume 71 Issue 5 Pages 294-295
    Published: 2017
    Released on J-STAGE: September 29, 2018
    DOIhttps://doi.org/10.11457/swsj.71.5_294
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    We proposed capillary zone electrophoresis（CZE）for identifying metal ions（Mg2＋, Ca2＋, Mn2＋, Fe3＋, and Zn2＋）in the common ice plant（Mesembryanthemum crystallinum L.）using complexation with trans-cyclohexane-1,2-diaminetetraacetic acid（CyDTA）. Analytes in an extract from the common ice plant were detected simultaneously and were separated from coexisting substances. However, analytical results obtained using the proposed procedures did not agree sufficiently with those obtained using inductively coupled plasma atomic emission spectrometry（ICP-AES）. Results suggest the potential usefulness of the proposed method, but further study must be conducted to improve the method.
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  • Preliminary Study for Determining Principal-Component Ions in Salts Using Capillary Zone Electrophoresis
    Shohei HORI, Keiichi FUKUSHI, Hideo OKAMURA, Satoshi ASAOKA
    2017 Volume 71 Issue 5 Pages 296-297
    Published: 2017
    Released on J-STAGE: September 29, 2018
    DOIhttps://doi.org/10.11457/swsj.71.5_296
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    This report presents preliminary results for determining principal-component ions in salts using capillary zone electrophoresis（CZE）with a capacitively coupled contactless conductivity detector（C4D）. The method determined cations simultaneously in a single analysis and then anions in another run using the same background electrolyte（BGE）. Analytical results for major components（Na＋ and Cl－）in salts obtained using the proposed procedure agreed closely with those obtained using conventional methods. The potential usefulness of the proposed method was inferred, although sufficient agreement was not found for both results of minor components（K＋, Mg2＋, Ca2＋, and SO42－）. Further study must be conducted to improve the method.
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  • Solid-Phase Extraction of Lithium in Seawater with Porous Polymer Resin Impregnated with Lithium-Ion Selective Metallohost
    Shoichi KATSUTA, Toshihiro NAKAMURA
    2017 Volume 71 Issue 5 Pages 298-299
    Published: 2017
    Released on J-STAGE: September 29, 2018
    DOIhttps://doi.org/10.11457/swsj.71.5_298
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    The solid-phase extraction of Li＋ in aqueous solution using a porous polymer resin（Diaion® HP2MG）impregnated with a Li＋-selective metallohost, ［｛Ru（DMA）（pyO2）｝3］（DMA＝3,5-dimethylanisole, pyO2＝2,3-pyridinediolate）, was investigated. Compared with the solvent extraction using an organic solvent solution of the same metallohost, the solid-phase method exhibited much faster extraction of Li＋ but lower Li＋/Na＋ selectivity. The proposed method was applied successfully to the separation of Li＋ in artificial seawater prior to the flame photometric determination.
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Original Paper
  • Production of Polyethylene-Based Ion-Exchange Membranes for Electrodialysis of Seawater by Electron Beam-Induced Graft Polymerization（I）Cation-Exchange Membranes
    Takeshi NAGATANI, Takaaki SASAKI, Kyoichi SAITO
    2017 Volume 71 Issue 5 Pages 300-307
    Published: 2017
    Released on J-STAGE: September 29, 2018
    DOIhttps://doi.org/10.11457/swsj.71.5_300
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    Cation-exchange membranes for application to electrodialysis were prepared from commercially available polyethylene films using electron-beam-induced（EB-induced）graft polymerization. Three kinds of polyethylene, namely, low-density（LDPE）, high-density（HDPE）, and ultra-high molecular weight polyethylene（UHMWPE）, were adopted as the starting films. Styrene was graft-polymerized onto the film by immersing EB-preirradiated PE film in a styrene/xylene solution before sulfonation of the styrene-grafted membrane with a chlorosulfone/dichloroethane solution. The ion-exchange capacity, water content, membrane resistance, and tensile strength were measured, and the performance of electrodialysis of seawater was evaluated. The tensile strength of a cation-exchange membrane prepared using an LDPE or HDPE film（2000 ～ 3000 N/cm2）was found to be comparable to that of a commonly used cation-exchange membrane, Selemion® CSO, whereas a UHMWPE-based cation-exchange membrane was found to have twice the tensile strength of Selemion® CSO（4000 ～ 5000 N/cm2）. An electrodialyzer fabricated using a membrane pair consisting of the developed cation-exchange membrane and the commercial anion-exchange membrane, Selemion® ASA, exhibited a higher concentration of chloride in the concentration chamber than a pair of Selemion CSO and ASA. For example, the chloride concentration rose by 20 ％ at an identical membrane resistance of 1.5 Ωcm2.
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Original Paper
  • Binding Capacity of Halophilic Histidine-rich Metal-binding Protein and Potential Application for Bio-sorption of Heavy-metals from Saline Environments
    Daiki OTSUJI, Michiru KUROKI, Hiroko TOKUNAGA, Rui YAMAGUCHI, Yuhei TO ...
    2017 Volume 71 Issue 5 Pages 308-314
    Published: 2017
    Released on J-STAGE: September 29, 2018
    DOIhttps://doi.org/10.11457/swsj.71.5_308
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    His-rich metal binding protein（HP）from halophilic marine bacterium Chromohalobacter salexigens has been characterized by its unique insertion sequence consisting of 46 amino acid residues, IS46 with abundant His residues, identified from the sequence comparison with well-studied other metal binding proteins such as TroA from Treponema pallidum. Here, we carried out equilibrium dialysis of HP against buffer solutions containing Zn, Cu, Ni or Mn ions for quantitative determination of the metal-binding capacity of HP. It was found that a maximum 10 molecules of Zn, Cu or Ni ions was bound to one molecule of HP under the saturated conditions. The affinity of metal ions to HP was Zn ＞ Cu ＞ Ni ＞ Mn. We further examined the potential use of HP for bio-sorption of metal ions in saline environments. His-tagged HP-immobilized Sepharose column bound 9.5 Ni ions per one molecule of the immobilized protein, suggesting possible applications of HP for bio-sorption and recovery of heavy metal ions under saline conditions.
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Note
  • Prevention of Settlement of Cyprids to the Bottom of a Spherical Surface by Small-Bubble Flow
    Haruo MIMURA, Kota SHIODA, Kosuke HAYASHI, Akio TOMIYAMA
    2017 Volume 71 Issue 5 Pages 315-320
    Published: 2017
    Released on J-STAGE: September 29, 2018
    DOIhttps://doi.org/10.11457/swsj.71.5_315
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    A round flask fixed in a fish tank was continuously covered by small bubbles. The number of barnacles that grew on the lower hemisphere was 35 to 45 individuals when small bubbles were supplied for 30 days. When bubbles were not supplied, 664 individuals settled on the area. Small bubbles with diameters of 51 to 100 μm showed the highest frequency around the lower hemisphere of a round flask, the values of which were 32.6 to 40.2％. Small bubbles with diameters of 151 to 300 μm increased from 3.4％ at 95 mm below the bottom of a flask to 11.3 to 17.0％ around the lower hemisphere. These results indicate that small bubbles with diameters of 51 to 300 μm can prevent the settlement of cyprids. The NP 2 model showed that small bubbles with diameters of 75 to 175 μm can reach the bottom with high probability, indicating that settlement of cyprids can be prevented effectively by the supply of similar sizes of small bubbles with cyprids, such as 200 to 500 nm.
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