Reductive dissolution and release of arsenic from arsenopyrite by a novel arsenate-respiring bacterium from the arsenic-contaminated soils
| Autor: | Xianbin Zhu, Yanxin Wang, Xiaoming Chen, Yahaya Kudush Kawa, Jianing Wang, Xian-Chun Zeng |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
Arsenopyrite Thiosulfate Mineral 030106 microbiology Arsenate food and beverages chemistry.chemical_element 010501 environmental sciences 01 natural sciences Microbiology Anoxic waters Biomaterials 03 medical and health sciences chemistry.chemical_compound chemistry Environmental chemistry visual_art visual_art.visual_art_medium Sulfate Waste Management and Disposal Dissolution Arsenic 0105 earth and related environmental sciences |
| Zdroj: | International Biodeterioration & Biodegradation. 143:104712 |
| ISSN: | 0964-8305 |
| DOI: | 10.1016/j.ibiod.2019.05.029 |
| Popis: | It is well established that arsenopyrite can be dissolved by both oxygen and microbes under oxic conditions; however, little is known about whether it can be mobilized under anoxic conditions. Here, we isolated a dissimilatory arsenate-respiring prokaryote (DARP) strain (Citrobacter sp. A99) from arsenic-contaminated soils. It respires arsenate, ferric iron and thiosulfate, but not sulfate. Molecular features of A99 suggest that it is a new DARP. A99 can promote the dissolution and release of arsenic from arsenopyrite, and addition of sulfate enhanced the microbial dissolution of arsenic. SEM/EDS analysis suggested that the bioreduction led to marked changes in the mineral structure, and the residual grains contained much lower contents of arsenic compared to wild-type minerals. Based on the findings of this work, a mechanic hypothesis was proposed to explain the reductive dissolution of arsenopyrite catalyzed by A99 cells. This work suggests that arsenopyrite can be significantly reduced and dissolved by indigenous DARPs under anaerobic conditions. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect