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Volume 57 (2003)
- Issue 6 Pages 416-
- Issue 5 Pages 349-
- Issue 4 Pages 253-
- Issue 3 Pages 150-
- Issue 2 Pages 77-
- Issue 1 Pages 3-
Volume 57, Issue 2
Displaying 1-9 of 9 articles from this issue
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Hideo TOGANO2003 Volume 57 Issue 2 Pages 77-83
Published: 2003
Released on J-STAGE: February 19, 2013
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Yoichi KOJIMA, Nagahito ASANO, Shigeo TSUJIKAWA2003 Volume 57 Issue 2 Pages 84-88
Published: 2003
Released on J-STAGE: February 19, 2013
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Ken TSUDA, Masatoshi KUBOUCHI2003 Volume 57 Issue 2 Pages 89-92
Published: 2003
Released on J-STAGE: February 19, 2013
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Hideo TOGANO2003 Volume 57 Issue 2 Pages 93-102
Published: 2003
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSThis work is based on the lectures which were done three times at the Workshop about Materials for Salt-Making Apparatus, belonging to the Society of Sea Water Science, Japan.
This work is composed of part-1 and part-2. This manuscript is part-1 and intended for the conditions which reaction materials concerned with corrosion phenomena are present at equilibrium. Part-2 is scheduled to be reported in the next issue, and intended for the conditions which participate in corrosion velocity.
Some figures and tables are quoted from well-known corrosion textbooks shown at the end of this manuscript. I wish to express my gratitude to the authors and the publishers.View full abstractDownload PDF (5502K) -
A Proposal for A New Reduction Method of Global Atmospheric CO2Katsuyoshi TATENUMA, Jun SUZUKI, Osamu ARAI, Kiyoko KUROSAWA, Kosuke Y ...2003 Volume 57 Issue 2 Pages 103-112
Published: 2003
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSFor promoting the absorption of atmospheric CO2 into the ocean, the use of electrolysis treatment of seawater to produce calcium carbonate (CaCO3) and decrease the concentration of carbonate ion in a superficial seawater was studied. Through an experiment using a continuous flow electrolytic cell with a porous separating membrane, a large amount of H2 gas and CaCO3 particle were produced at the cathode, and a small amount of O2 gas was produced at the anode. CO2 gas was not entirely emitted during the electrolysis treatment, and the mixture of catholyte seawater, after the separation of CaCO3, and anolyte seawater was alkalined at pH 8.3-8.7 compared to the raw seawater of pH 8.1. A precipitate produced by the electrolysis treatment was composed of aragonite-CaCO3 and brucite-Mg(OH)2, and the amount, chemical composition and crystal shape were changed by the electrolysis conditions. Based on the fact that the excess atmospheric CO2 could be stably isolated from the biosphere as solid CaCO3 submerged on a sea floor, and alkalined seawater should have a potential to promote the absorption of atmospheric CO2 without seawater acidification by the direct CO2 discharge, the proposed method might become a solution for global warming.View full abstractDownload PDF (7203K) -
Masayoshi SAWAMURA, Naohiro IMAE, Anas Khairul FAZIAN, Hiroyuki UKEDA, ...2003 Volume 57 Issue 2 Pages 113-121
Published: 2003
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSThe effect of the Muroto deep seawater (DSW) on the cooked flavor of amino acid-sugar model solutions was examined. The aqua media used were DSW, surface seawater, 3.5% NaCl solution, desalting DSW, and Milli-Q water. Each reaction model was composed of five different amino acids and glucose. For the headspace gas analyses of the cooked flavor, the solid phase microextraction (SPME) method was employed. Many compounds were created by each amino acid-glucose, including aldehydes, alcohols, esters, ketones, furans, and pyrazines, and identified by GC-MS. Quantitative determination showed that for all amino acid-glucose models, volatile compounds were created to a greater extent in the DSW medium than they were in the other aqua media. This suggested that the creation of the cooked flavor from amino acid-glucose models could be promoted by the use of the DSW medium.View full abstractDownload PDF (6335K) -
Kazutoshi IWAMOTO, Kazumasa WATANABE, Takayuki MAEHASHI, Manabu SENO2003 Volume 57 Issue 2 Pages 122-127
Published: 2003
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSIn order to study water ionization in the electrodeionization process, the transport of ions through the ion-exchange resin layer was examined. Ion-exchange resins were introduced between two platinum electrodes and impedance was measured under a flow of ultrapure water, suggesting that the transport of ions associated with the charge-discharge process of the electric double layer on the platinum electrodes is a diffusion-controlled process and that water ionization may proceed autocatalytically. From these results, water ionization in the electrodeionization process is discussed.View full abstractDownload PDF (4869K) -
Akira YAMAUCHI, Leo EHARA, Shoichiro YOSHIDA2003 Volume 57 Issue 2 Pages 128-133
Published: 2003
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSIn order to examine more effective salt enrichment from sea water, first of all, conventional membrane parameters such as electroosmotic coefficient β and filtration coefficient Lp were rearranged on the basis of fundamental physicochemical units regarding the ion exchange membranes and then summarized. On the other hand, the salt producing data from electrodialysis were analyzed from basic physicochemical aspects and the factors controlling the effective salt enrichment were studied. It turned out that electroosmotic coefficients play an important role in electrodialysis and a value required for saturated brine concentration was proposed.View full abstractDownload PDF (4450K) -
Yasushi NIINO, Hitomi NISHIMURA, Akihiro KOGA2003 Volume 57 Issue 2 Pages 134-137
Published: 2003
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSThe amounts of iodine in commercial edible salts were measured by the inductively coupled plasma mass spectrometry (ICP-MS), and the following results were obtained depending on the kind of salt. The amount of iodine in the salts manufactured by evaporation concentration of seawater was 0.3 mg/kg on the average, which was higher than those of other kinds of salt, and it tended to be proportional to the amount of magnesium chloride. The re-crystallized salts of imported solar salt contained low amounts of iodine, less than 0.1 mg/kg. The salts manufactured from brine by the ion exchange membrane electricity dialysis method contained low amounts of iodine, less than 0.2 mg/kg except for one sample. It was inferred that the difference in the concentration characteristic of ion exchange membrane electricity dialysis was a factor in the difference in the amount of iodine among the analyzed salts of this kind.View full abstractDownload PDF (2828K)
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