| A geochemical study of redox behavior of As in a contaminated aquifer from Sonargaon, Central Bangladesh |
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| 作者姓名： | Takaaki Itai Harue Masuda Yoshio Takahashi Muneki Mitamura Minoru Kusakabe |
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| 作者单位： | [1]Department of Earth and Planetary Systems Science, Hiroshima University, Higashi-hiroshima, Japan [2]Department of Earth Science, Osaka-city University, Sumiyoshi-ku, Osaka, Japan [3]Institute for Study of the Earth＇s Interior, Okayama University, Tottori, Japan |
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| 摘 要： | The Bengal Basin has been exposed to the most serious As problem in the world. Although it has been agreed well among many researchers that the contamination has been induced by natural geochemical process, detailed mechanisms are still under debate. Arsenic is easily soluble into groundwater as pentavalent arsenate and trivalent arsenite. Their adsorption behavior for various solid phases, particularly for Fe oxyhydroxide （FeOOH）, is different. Thus speciation of As in solid phase is essential to examine the process of contamination. However, few studies have been done about As speciation in sediment due to its analytical difficulty. In this study, we applied XANES （X-ray adsorption near the edge structure） spectroscopy to determine oxidation states of As and Fe, and investigate As behavior along change in redox condition. We studied the Sonargaon area located 25 km southeast of Dhaka. Sediment core samples were collected from one site in the area up to the depth of 100 m using penetration-drilling method. The samples were packed into oxygen impermeable film with deoxidizer on site,
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| 关 键 词： | 砷 氧化还原作用 地球化学 地下水 含水层 水体污染 |
A geochemical study of redox behavior of As in a contaminated aquifer from Sonargaon, Central Bangladesh |
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| Takaaki Itai Harue Masuda Yoshio Takahashi Muneki Mitamura Minoru Kusakabe.A geochemical study of redox behavior of As in a contaminated aquifer from Sonargaon, Central Bangladesh[J].Chinese Journal of Geochemistry,2006,25(B08):99-100. |
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| Abstract: | |
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| Keywords: | arsenic redox condition XANES Bangladesh groundwater |
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