APPLICATION OF THE SUCCESSIVE SELECTIVE DISSOLUTION PROCEDURE TO DISTINGUISH TODOROKITE FROM OTHER MINERALS AND THEIR MICROMORPHOLOGICAL OBSERVATIONS
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概要
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Todorokite, one of the major Mn minerals, is less common and distinguishing the todorokite from lithiophorite and other associated Fe/Mn minerals is important. For many years, the crystal structure of todorokite was a subject of considerable conjecture and controversy. Therefore, the study was conducted to (a) distinguish todorokite from lithiophorite and iron oxide minerals, and (b) investigate the detailed micromorphological structures of todorokite and its associated Fe/Mn minerals. Fe/Mn brittle (MN-12) and nodule (MN-15) samples were collected from Shinzato, Sashiki-cho and Onna, Onna-son areas, respectively. Their surrounding soils were developed from Ryukyu limestone. They were analyzed using the successive selective dissolution procedure (SSDP) in combination with X-ray diffraction technique (XRD), while detailed micromorphology of todorokite and its associated minerals were observed using scanning electron microscopic technique (SEM). The NaOH treatment of the SSDP dissolved kaolinite and gibbsite, concentrating birnessite (Bs), todorokite (Td), Iithiophorite (Lp), and goethite (Ge), specially in MN-12 sample. The HAHC treatment at 25℃ effectively dissolved both birnessite and todorokite, but lithiophorite and goethite remained undissolved. A subsequent extraction with HAHC at 60℃ dissolved lithiophorite without disturbing goethite. Finally, the DCB treatment dissolved goethite. Thus, extraction with HAHC at 25℃ and 60℃ were useful in distinguishing todorokite from lithiophorite and iron oxide minerals. Elemental analysis with respect to SSDP proved the presence of Fe/Mn minerals in semi-quantitative basis. Micromorphological observation explained that well crystallized todorokite minerals spread throughout the sample of MN-12 collected from the Sinzato area, Okinawa. Micrographs clearly show the detailed crystal nature of natural birnessite, todorokite, Iithiophorite, gibssite, goethite and their association with other silicate minerals.
- 日本粘土学会の論文
著者
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TOKASHIKI Yoshihiro
Dept. Environmental Sciences & Technology, College of Agriculture, University of the Ryukyus
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Arachchi Lal
Dept. Of Environmental Science & Technology Faculty Of Agriculture University Of The Ryukyus
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Bakker Alexandre
Dept. Of Environmental Science & Technology Faculty Of Agriculture University Of The Ryukyus
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Tokashiki Y
Dept. Of Environmental Science & Technology Faculty Of Agriculture University Of The Ryukyus
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