期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 402, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.hazmat.2020.123717
关键词
Jarosite; Arsenic; Sulfate reducing bacterium; Secondary mineral; Mackinawite
资金
- National Nature Science Foundation of China [41720104004, 41977277, 41931288]
- National Key Research and Development Program of China [2017YFD0801000]
- Guangdong Natural Science Foundation [2018A030313918]
- Guangdong Province Science and Technology Fund [2018B020205003]
The addition of dissolved SO42- can mitigate the migration of As into the aqueous phase and replace jarosite with mackinawite. The microbial sulfidization of As-bearing jarosite by sulfate reducing bacteria reduced all As5+ to As3+, which is important for a better understanding of the geochemical cycling of elements As, S, and Fe in acid mine drainage and acid sulfate soil environments.
Microbial sulfidization of arsenic (As)-bearing jarosite involves complex processes and is yet to be fully eluci-dated. Here, we investigated the behavior of As during reductive dissolution of As(V)-bearing jarosite by a pure sulfate reducing bacterium with or without dissolved SO42- amendment. Changes of aqueous chemistry, mineralogical characteristics, and As speciation were examined in batch experiments. The results indicated that jarosite was mostly replaced by mackinawite in the system with added SO42-. In the medium without additional SO42-, mackinawite, vivianite, pyrite, and magnetite formed as secondary Fe minerals, though 24.55 % of total Fe was in form of an aqueous Fe2+ phase. The produced Fe2+ in turn catalyzed the transformation of jarosite. At the end of the incubation, 41.99 % and 48.10 % of As in the solid phase got released into the aqueous phase in the systems with and without added SO42-, respectively. The addition of dissolved SO42- mitigated the mobilization of As into the aqueous phase. In addition, all As5+ on the solid surface was reduced to As3+ during the microbial sulfidization of As-bearing jarosite. These findings are important for a better understanding of geochemical cycling of elements As, S, and Fe in acid mine drainage and acid sulfate soil environments.
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