All issues
Volume 39 (1985 - 198･･･
- Issue 6 Pages 357-
- Issue 5 Pages 289-
- Issue 4 Pages 189-
- Issue 3 Pages 121-
- Issue 2 Pages 68-
- Issue 1 Pages 3-
Volume 39, Issue 2
Displaying 1-5 of 5 articles from this issue
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Ken TOYOKURA1985 Volume 39 Issue 2 Pages 68-73
Published: 1985
Released on J-STAGE: February 19, 2013
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Shigetake KAWASAKI1985 Volume 39 Issue 2 Pages 74-88
Published: 1985
Released on J-STAGE: February 19, 2013
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Shigeroku YAMAGUCHI, Katsuya UESUGI1985 Volume 39 Issue 2 Pages 89-93
Published: 1985
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSA microgram amount of manganese, nickel and zinc contained in sea water and common salt were determined by atomic absorption spectrophotometry in conjunction with extraction technique. These metals formed complexes with 2-hydroxy-1-naphthaldehyde-4-phenyl-3-thiosemicarbazone (HNA·PS), and they were extracted into chloroform and then extracted back with 1M hydrochloric acid into aqueous phase. The solution resulted therefrom was sprayed into an acetylene-air flame. To find the optimum condition for the extraction of these metals, the effect of pH, concentration of HNA·PS, shaking time, and effect of diverse substances were examined. Less than 10μg of these metals were quantitatively extracted into 10 ml of 2.5×10-4M HNA·PS chloroform solution from aqueous solution at pH 9.6, by shaking for 10 min. Good recoveries of metals added to artificial sea water and sea water samples are demonstrated.View full abstractDownload PDF (2903K) -
Masami HASEGAWA, Hitomi NISHIMURA, Kiyomi SOGA, Shizuo SUGITA1985 Volume 39 Issue 2 Pages 94-99
Published: 1985
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSIn November 1983, the authors collected a series of samples during the process of salt production from sea-water in those salt-making factories equipped with different kinds of membrane. They conducted researches mainly on the concentration of brine in those latest salt-making factories from the standpoint of chemistry. The results obtained from the above researches were as follows:
1. After new types of membrane and electrodialyzer were introduced to the factories, the compositions of brine were almost similar to each other. In general, there was a trend for potassium to increase its concentration and for calcium and magnesium to decrease their concentration.
2. In the case of the brine which has high ratio of sodium chloride to the total salt, it was necessary to raise the temperature of the evaporator and to increase the concentration ratio in order to increase the ratio of crystallization of sodium chloride. The abundant concentration of potassium chloride in the mother liquor tended to cause the deposition of potassium chloride.
3. Therefore, it was one of the best ways to supplement the deficiency of calcium chloride and magnesium chloride into the brine or the mother liquor for the purpose of increasing the crystallization ratio of sodium chloride and controlling the deposition of potassium chloride.
4. Due to the use of the customary combination method and to the fact that the scale component in the brine has decreased, there seems to have been less problem about the deposition and adhession of scale into the evaporator. However, one of the factories which has the backward supplying system of brine seems to have some problems about scale deposition.View full abstractDownload PDF (4481K) -
Shigeru MIYOSHI1985 Volume 39 Issue 2 Pages 100-108
Published: 1985
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSDownload PDF (7303K)
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