Chlorite : source of arsenic groundwater pollution in the Holocene aquifer of Bangladesh
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- MASUDA HARUE
- Department of Geosciences, Osaka City University
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- SHINODA KEIJI
- Department of Geosciences, Osaka City University
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- OKUDAIRA TAKAMOTO
- Department of Geosciences, Osaka City University
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- TAKAHASHI YOSHIO
- Department of Earth and Planetary Science, Hiroshima University
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- NOGUCHI NAOKI
- Department of Geosciences, Osaka City University
書誌事項
- タイトル別名
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- Chlorite—source of arsenic groundwater pollution in the Holocene aquifer of Bangladesh
- Chlorite^|^mdash;source of arsenic groundwater pollution in the Holocene aquifer of Bangladesh
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Three basic minerals, biotite, chlorite and amphibole, were mineralogically and chemically examined to specify primary host phase(s) of As in the aquifer sediments and verify the formation mechanism of As contaminated groundwater of Sonargaon, Bangladesh, where the highest As contaminated groundwater appears in actively recharging zones. Among those minerals, only the chlorite included As by μ-XRF analysis. Fe-rich and tritoctahedral nature indicated this chlorite termed chamosite. The chlorite was weathered to form goethite on the cleavage, however, the goethite did not host the As. Combining with the saturation of goethite in the groundwater (Itai et al., 2008), in situ chemical weathering of the chlorite promoted by accelerated aerobic water infiltration is suggested to be the first stage of formation of the As contaminated groundwater of the Holocene aquifer. This study implies the importance of aerobic aquifer condition to promote the As release via decomposition of As-bearing detrital mineral(s) as the formation mechanism of As contaminated groundwater in the Ganges-Bramaptra-Meghna river basin.
収録刊行物
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- GEOCHEMICAL JOURNAL
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GEOCHEMICAL JOURNAL 46 (5), 381-391, 2012
一般社団法人日本地球化学会
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詳細情報 詳細情報について
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- CRID
- 1390282679529738496
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- NII論文ID
- 10031137501
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- NII書誌ID
- AA00654975
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- COI
- 1:CAS:528:DC%2BC38XhvFSns7jO
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- ISSN
- 18805973
- 00167002
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- NDL書誌ID
- 024025471
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
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- KAKEN
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- 使用不可