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Controlling microbial arsenite oxidation and mobilization in arsenite-adsorbed iron minerals: The Influence of pH conditions and mineralogical composition
Cai, Xiaolin; Zhang, Zhennan; Yin, Naiyi; Lu, Wenyi; Du, Huili; Yang, Mei; Cui, Liwei; Chen, Shibao; Cui, Yanshan
2022-07-05
Source PublicationJOURNAL OF HAZARDOUS MATERIALS
ISSN0304-3894
Volume433Issue:0Pages:128778
AbstractThe oxidation of aqueous arsenite (As(III)) by As(III)-oxidizing bacteria is known to attenuate the mobilization and toxicity of arsenic, and is regarded as potential method for As(III)-pollution remediation. However, during the interactions between As(III)-oxidizing bacteria and different As(III)-adsorbed soil Fe-minerals, the oxidation and partitioning of solid-phase As(III), as well as the controlling mechanisms, remain unclear. In this study, we therefore incubated three As(III)-adsorbed Fe-minerals with a typical As(III)-oxidizing bacteria (Pseudomonas sp. HN-1) at different pH conditions. After microbial oxidation, the percentage of arsenate (As(V)) was significantly higher at pH 7 (15-94%) and 9 (12-89%) than at pH 4 (6-50%) in all Fe-minerals. Incubation of As(III)-oxidizing bacteria promoted As-immobilization under acidic-conditions but As-mobilization under alkaline-conditions. Arsenic-X-ray adsorption spectroscopy results showed that solid-phase As(V) fraction in goethite, hematite and magnetite was 27-64%, 5-12% and 50-91%, respectively. Compared with the corner-sharing As(III)-adsorption complexes formed on magnetite, the edge-sharing complexes on hematite were significantly more stable towards microbial-oxidation. Additionally, the strong adhesion between strain HN-1 and hematite probably limit bacterial-activity and mobility, thereby inhibiting microbial As(III)-oxidation. Our findings elucidate the controlling mechanisms of microbial As(III)-oxidation in different As(III)-adsorbed Fe-minerals and demonstrate strain HN-1 is an excellent candidate for As(III)-remediation in soils containing goethite and magnetite.
Department土壤环境科学与技术实验室 ; 土壤环境科学与技术实验室
KeywordSPECTROSCOPIC EVIDENCE OXIDIZING BACTERIUM PADDY SOIL ARSENATE ADSORPTION ARSENIC(III) MAGNETITE SORPTION GOETHITE FERRIHYDRITE
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/47756
Collection土壤环境科学实验室
Corresponding AuthorCui, Yanshan
Affiliation1.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 101408, Peoples R China
2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China
3.Binzhou Inst Technol, Binzhou 256606, Shandong, Peoples R China
4.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China
Recommended Citation
GB/T 7714
Cai, Xiaolin,Zhang, Zhennan,Yin, Naiyi,et al. Controlling microbial arsenite oxidation and mobilization in arsenite-adsorbed iron minerals: The Influence of pH conditions and mineralogical composition[J]. JOURNAL OF HAZARDOUS MATERIALS,2022,433(0):128778.
APA Cai, Xiaolin.,Zhang, Zhennan.,Yin, Naiyi.,Lu, Wenyi.,Du, Huili.,...&Cui, Yanshan.(2022).Controlling microbial arsenite oxidation and mobilization in arsenite-adsorbed iron minerals: The Influence of pH conditions and mineralogical composition.JOURNAL OF HAZARDOUS MATERIALS,433(0),128778.
MLA Cai, Xiaolin,et al."Controlling microbial arsenite oxidation and mobilization in arsenite-adsorbed iron minerals: The Influence of pH conditions and mineralogical composition".JOURNAL OF HAZARDOUS MATERIALS 433.0(2022):128778.
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