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Arsenic In Geothermal Systems

http://hdl.handle.net/10458/6264
http://hdl.handle.net/10458/6264
b0c7f18c-8746-4a3c-bdc0-ae711f172453
名前 / ファイル ライセンス アクション
s2-4_arsenic2015.pdf 本文 (61.8 kB)
Item type その他 / Others(1)
公開日 2020-06-21
タイトル
タイトル Arsenic In Geothermal Systems
言語 en
言語
言語 eng
キーワード
言語 en
主題Scheme Other
主題 Arsenic, geothermal environment
資源タイプ
資源タイプ識別子 http://purl.org/coar/resource_type/c_1843
資源タイプ other
著者 Chelo, S. Pascua

× Chelo, S. Pascua

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en Chelo, S. Pascua

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内容記述タイプ Abstract
内容記述 The geothermal environment is a geochemically dynamic environment where the variations in pH, redox and temperature greatly affect the stability of aqueous ligands present. Arsenic complexes dominance and stabilities are greatly in fluenced by these physicochemical variations, and thus their affinity with mineralogical hosts.
In the study areas in Japan and the Philippines, amorphous silica and a smectite were found to uptake arsenic stably. Their resistance to rigorous leaching in either highly alkaline or highly acidic solution suggests that they must be structurally incorporated, especially in the smectite found in Japan. X -ray spectroscopy has further shown that the arsenic is dominantly in the form of AS^llI-O species and only minor contributions from both As^V-O and As^lll-S forms. The potential of the clay to uptake arsenic was further investigated in synthesis experiments designed to determine the mechanism involved. Both co-precipitation with smectites through initial Aslll-Si complexation, and sorption to precursory poorly crystalline phyllosilicates was able to uptake arsenic in large amounts and offers significant stability.
Despite difficulties in characterizing the poorly crystalline synthesized phyllosilicates, the timing of arsenic uptake based on co-precipitation and sorption experiments provide insights on the possible crystallographic location of arsenic in the phyllosilicate structure. Arsenic uptake through initial complexation with dissolved silica would suggest incorporation into the tetrahedral structure, and would also support its affinity with amorphous silica in the natural environment. Initial adsoption with a poorly crystalline phyllosilicate and later incorporation would more favorably enable it to substitute into octahedral sites (i.e. Mg2+) rather than the tetrahedral sites. In both cases of uptake, it is implied that arsenic can go into the phyllosilicate structure with the in situ formed mineralogical hosts similar to the documented arsenic-bearing smectite.
言語 en
書誌情報 en : 4th InternationalArsenic Symposium in MIYAZAKI 2015

p. 16-19, 発行日 2015-10
出版者
出版者 University of Miyazaki, IRISH
言語 en
著者版フラグ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
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