Scholarlink

<p>Ferric sulfoarsenates are important secondary As-containing minerals in mining areas. A bukovskýite [Fe<sub>2</sub>(AsO<sub>4</sub>)(SO<sub>4</sub>)(OH)⋅7H<sub>2</sub>O] sample was collected from an historic mine area in Sichuan Province, China. Petrological analysis from thin section showed that bukovskýite occurred with scorodite. Due to the interference of diffraction peaks, the polarized observation of thin section could provide more accurate identification for bukovskýite. Bukovskýite is more soluble than scorodite but less soluble than amorphous ferric arsenate at pH &lt; 4, the solubility of bukovskýite becomes lower than scorodite at pH &gt; 6. The solubility reached a minimum at pH of ~ 5.2. The solubility product (K<sub>sp</sub>) of bukovskýite was experimentally determined to be 10<sup>− 29.544</sup>, which is in accordance with the value calculated by Gibbs free energy. Once acted with sulfate reducing bacteria (<i>Desulfovibrio vlugaris miyazaki</i>; SRB), the dominant arsenic species released from bukovskýite varied from As<sup>5+</sup> to As<sup>3+</sup>, and the concentration of As<sup>3+</sup> reached 346&#xa0;µg/g. The domain colloidal As species was As<sup>3+</sup>, accounting for 13% – 90% of total As. The results suggest that bukovskýite can be an effective proxy for mineralizing As under arsenate- and sulfate-rich conditions, such as some mine areas.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Solubility of bukovskýite [Fe2(AsO4)(SO4)(OH)⋅7H2O] and arsenic species under abiotic and anaerobic biotic conditions: implications for As release in mining areas

  • 期刊论文

  • 发表日期：

    2026年4月11日

查看全文
  • Xi Wang,
  • Jingmei Zhang,
  • Ying Huang,
  • Jing Liu

摘要

Ferric sulfoarsenates are important secondary As-containing minerals in mining areas. A bukovskýite [Fe2(AsO4)(SO4)(OH)⋅7H2O] sample was collected from an historic mine area in Sichuan Province, China. Petrological analysis from thin section showed that bukovskýite occurred with scorodite. Due to the interference of diffraction peaks, the polarized observation of thin section could provide more accurate identification for bukovskýite. Bukovskýite is more soluble than scorodite but less soluble than amorphous ferric arsenate at pH < 4, the solubility of bukovskýite becomes lower than scorodite at pH > 6. The solubility reached a minimum at pH of ~ 5.2. The solubility product (Ksp) of bukovskýite was experimentally determined to be 10− 29.544, which is in accordance with the value calculated by Gibbs free energy. Once acted with sulfate reducing bacteria (Desulfovibrio vlugaris miyazaki; SRB), the dominant arsenic species released from bukovskýite varied from As5+ to As3+, and the concentration of As3+ reached 346 µg/g. The domain colloidal As species was As3+, accounting for 13% – 90% of total As. The results suggest that bukovskýite can be an effective proxy for mineralizing As under arsenate- and sulfate-rich conditions, such as some mine areas.