Thiobacillus ferrooxidansによるジャロサイトおよびアンモニオジャロサイトの生成実験

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  • Experimental study on formation of jarosite and ammoniojarosite associated with Thiobacillus ferrooxidans
  • Thiobacillus ferrooxidans ニ ヨル ジャロサイト オ

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Jarosite KFe3(SO4)2(OH)6 and ammoniojarosite NH4Fe3(SO4)2(OH)6 were experimentaly formed in 9 K-medium with Thiobacillus ferrooxidans at 33℃ under acidic condition. The product shows characteristic peaks of jarosite at 3.08, 1.99 and 1.83 A , and those of ammoniojarosite at 3.09, 5.12, 1.98 and 1.83 A in use X-ray powder diffraction and electron diffraction pattern. TEM and SEM observations revealed the crystal growth processes of these minerals as follows ; Bacillus bacterial cells take the form of cross-finger. Both iron and sulfur components precipitated on cell wall. The iron component takes the form of burs, whereas the sulfur component forms rosary-shaped materials. The sizes of iron materials range from 0.5 to 2.0 μm in diameter while those of sulfur materials range from 0.05 to 0.1μm in diameter. Next, potassium and hydroxyl in 9 K-medium reacted on both iron and sulfur components on the cell wall. Cubic or platy jarosite, 0.1 to 5.0μm in diameter, is formed within 3 days. Jarosite of final products changed to reform rosary or parallel crystalline materials. Potassium in jarosite is substituted for ammonia to form ammoniojarosite within 5 days. Jarosite was produced by bacterial mineralization in 9 K-medium within 3 days, and those of ammoniojarosite within 5 days. Without Thiobacillus ferrooxidans, jarosite and ammoniojarosite were produced after 5 or 9 days respectively. The results suggest that Thiobacillus ferrooxidans contributes formation of jarosite and ammoniojarosite as catalyst.

収録刊行物

  • 地球科学

    地球科学 47 (6), 493-505, 1993

    地学団体研究会

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