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 75, Issue 4
Displaying 1-8 of 8 articles from this issue
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Preface
Special Issue : “Symposium on Resources and Environment of Seawater 2021”
Commentary
Notes
  • Separation of Calcium, Cobalt, Magnesium and Strontium Ions from their EDTA Solution by means of Electrodialysis Accompanied by Metal Substitution Reaction with Copper Ion
    Hiroshi TAKAHASHI, Kosuke SUMIYA, Kazumasa TAKISAWA, Etsuko KASHIUCHI
    2021 Volume 75 Issue 4 Pages 198-203
    Published: 2021
    Released on J-STAGE: June 28, 2022
    DOIhttps://doi.org/10.11457/swsj.75.4_198
    JOURNAL FREE ACCESS
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    Electrodialysis treatment accompanied by metal substitution reaction was studied in order to separate calcium, cobalt, magnesium and strontium ions from a solution of their ethylenediaminetetraacetic acid （EDTA） complex. The electrodialysis stack consisted of three units of three cells containing the Feed, Reaction, and Strip compartments. The Feed solution, the Reaction solution, and the Strip solution, each of which flowed from the corresponding compartment, contained CuCl2, EDTA-metal complex, and NaCl solution, respectively. When the voltage was applied to the electrodialyzer, Cu2＋ proceeded from the Feed compartment to the Reaction compartment and acted as the substitute for the metal elements in the EDTA complexes. The resulting free metal ions moved to the Strip compartment and were separated. When the pH of the initial reaction solution was greater than 10, the solution pH changed significantly to acidic during electrodialysis. The behavior of pH changes in the reaction compartment was explained by a mathematical model that considered the equilibrium of the solution, the material balance of the chemical species, and electroneutrality in the solution.
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Lecture
Relay Essay (49)
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