New Mobilization Pathway of Antimonite: Thiolation and Oxidation by Dissimilatory Metal-Reducing Bacteria via Elemental Sulfur Respiration

Li Ye; Wen Zhong; Min Zhang

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New Mobilization Pathway of Antimonite: Thiolation and Oxidation by Dissimilatory Metal-Reducing Bacteria via Elemental Sulfur Respiration

机译：New Mobilization Pathway of Antimonite: Thiolation and Oxidation by Dissimilatory Metal-Reducing Bacteria via Elemental Sulfur Respiration

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Antimony (Sb) mobilization is widely explored with dissimilatory metal-reducing bacteria (DMRB) via microbial iron (III)-reduction. Here, our study found a previously unknown pathway whereby DMRB release adsorbed antimonite (Sb~III-O) from goethite via elemental sulfur (S~0) respiratory reduction under mild alkaline conditions. We incubated Sb~III-O-loaded goethite with Shewanelta oneidensis MR-1 in the presence of S~0 at pH 8.5. The incubation results showed that MR-1 reduced S~0 instead of goethite, and biogenic sulfide induced the formation of thioantimonite (Sb~III-S). Sb~III-S was then oxidized by S~0 to mobile thioantimonate (Sb~V-S), resulting in over fourfold greater Sb release to water compared with the abiotic control. Sb~IV-S was identified as the intermediate during the oxidation process by Fourier transform ion cyclotron resonance mass spectrometry and electron spin resonance analysis. The existence of Sb~IV-S reveals that the oxidation of Sb~III-S to Sb~V-S follows a two-step consecutive one-electron transfer from Sb to S atoms. Sb~V-S then links with Sb~III-S by sharing S atoms and inhibits Sb~III-S polymerization and Sb~III_2S3 precipitation like a 'capping agent'. This study clarifies the thiolation and oxidation pathway of Sb~III-O to Sb~V-S by S~0 respiration and expands the role of DMRB in the fate of Sb.

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《Environmental Science & Technology: ES&T》 |2022年第1期|652-659|共8页
作者
Li Ye; Wen Zhong; Min Zhang;
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作者单位

School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China;

State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境科学、安全科学;
关键词
antimony; thiolation; oxidation; polysulfide; transient Sb~IV-S; one-electron transfer;

New Mobilization Pathway of Antimonite: Thiolation and Oxidation by Dissimilatory Metal-Reducing Bacteria via Elemental Sulfur Respiration

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