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Articles by Katsumi Ishikawa
Total Records ( 3 ) for Katsumi Ishikawa
  Md. Abul Kalam Azad , Katsumi Ishikawa , A.K. Chowdhury , Tahmid H. Ansari and A.K.M. Faruk-E-Azam
  Investigations were conducted to examine the effects of different extractants on the amount of zinc extracted from the soils of six locations in Bangladesh. In this study, some extractants such as EDTA, HCl, ASI and CH3COONH4 were selected to use for comparative studies of their extractability to extract soil zinc. The extraction period was set to fix for 4 h for shaking of different soil samples adding with cited above proper reagent in polypropylene centrifuge tube on an end-over-end shaker. Results showed that the maximum amount of Zinc was extracted by using the extractant 0.05 M HCl in Tea, Madhupur, Farm of BAU (Bangladesh Agricultural University) and Poorly drained (Mymensingh). With the action of other reagents, the amount of extractable zinc was very little in all the supplied soil samples. Some exceptions occurred in the case of Ishurdi and Saline soils extracted by EDTA that showed the higher amount of zinc concentration than by the others. CH3COONH4 and ASI exposed to be poor reagents as to effective for the extraction of soil zinc. In the experimental results, it can be concluded that the ability of different extractants to extract soil zinc decreased in the order HCl> EDTA> CH3COONH4 > ASI.
  Md. Abul Kalam Azad and Katsumi Ishikawa
  The assurance of good-quality raw water and environmental protection are important to be solved. This study was conducted, directing major attention to the fact that some of the ceramics produced from silicate minerals as raw material have electrical functions such as electrical insulation, dielectric and piezoelectric properties. Stable granular ceramics having electrical charges at the surface were developed, using the natural raw materials of silicate minerals that have excellent moldabilities and sintering properties. Production of water having functions was attempted by effective use of the electrochemical energy of the ceramics with an efficient water treatment apparatus in which the granular ceramics were fluidized in water. In the experimental results, for the ceramics-treated water, it was clear that the surface activity increased and the volatilization speed of the chlorine was slow and also the ingredient of the irritation was controlled.
  Katsumi Ishikawa , Md. Abul Kalam Azad and Naima Islam
  In recent years, hot springs have become a part of modern medical rehabilitation and recuperation. Furthermore, hot springs are said to speed recovery from illness and protect against further ailment. The hot springs are inherited natural resource and it is necessary to preserve them for future generations. The study was carried out for the removal test of scale in hot spring by use of the ceramics fluidization treatment device in two locations of the Shiohitashi hot spring and the Obama hot spring in Japan. The results showed that scale of Shiohitashi hot spring was characteristic of containing large amount of iron ion and small amounts of calcium ion. The color of scale was reddish brown under the influence of them. However, the scale of Obama hot spring contained large amount of calcium ion, which increased twice as much as that before treatment and the color was white. These results made clear that removal of scale in hot spring by ceramics fluidization took effect on calcium ion. Although chloride in the sea might increase effects, it should be proved by the continuous experiments.
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