| Mineralogical and Geochemical Constraints on Arsenic Mobility in a Philippine Geothermal Field |
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| 作者姓名： | Chelo PASCUA Tsutomu SATO Glenn GOLLA |
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| 作者单位： | [1]Graduate School of Natural Science and Technology, Kanazawa University, Ishikawa, Japan [2]Institute of Nature and Environmental Technology, Kanazawa University, lshikawa, Japan [3]Unocal Philippines Incorporated, Makati City, Philippines |
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| 基金项目： | We would like to thank K. Ito and S. Tamamura for their assistance with the ICP-MS analyses. The help of staff in the Philippine Geothermal Incorporated, Tiwi, Albay during the collection of the samples is highly appreciated. |
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| 摘 要： | Arsenic is usually associated with sulphide minerals formed in the geothermal environment. However, sulphide minerals are prone to dissolution after contact with meteoric water under surface oxidizing conditions. Secondary precipitates that form from the dissolution of the primary sulfides exert a greater influence on arsenic mobility in the geothermal environment. Fe-hydroxides have very good affinity with dissolved arsenate and are stable under most surface oxidizing conditions. Both amorphous silica directly precipitated from geothermal fluids and possibly a kaolinite alteration can host a small significant amount of arsenic. These silicates are also more stable under a wide range of pH and redox conditions.
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| 关 键 词： | 砷 迁移率 地热环境 菲律宾 地球化学 |
| 收稿时间： | 2005-11-13 |
| 修稿时间： | 2006-02-17 |
Mineralogical and Geochemical Constraints on Arsenic Mobility in a Philippine Geothermal Field |
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| Authors: | Chelo;PASCUA;Tsutomu;SATO;Glenn;GOLLA |
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| Abstract: | Arsenic is usually associated with sulphide minerals formed in the geothermal environment. However, sulphide minerals are prone to dissolution after contact with meteoric water under surface oxidizing conditions. Secondary precipitates that form from the dissolution of the primary sulfides exert a greater influence on arsenic mobility in the geothermal environment. Fe-hydroxides have very good affinity with dissolved arsenate and are stable under most surface oxidizing conditions. Both amorphous silica directly precipitated from geothermal fluids and possibly a kaolinite alteration can host a small significant amount of arsenic. These silicates are also more stable under a wide range ofpH and redox conditions. |
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| Keywords: | arsenic mobility geothermal environment Philippines |
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