RCEES OpenIR  > 土壤环境科学实验室
Arsenate-reducing bacteria-mediated arsenic speciation changes and redistribution during mineral transformations in arsenate-associated goethite
Cai, Xiaolin; Yin, Naiyi; Wang, Pengfei; Du, Huili; Liu, Xiaotong; Cui, Yanshan
2020-11-05
Source PublicationJOURNAL OF HAZARDOUS MATERIALS
ISSN0304-3894
Volume398Pages:1-4
AbstractThe fate of Fe(III)-(oxyhydr)oxides-bound As was generally regulated by dissimilatory As(V)-reduction. However, the impact of pH and bacterial conditions on the coupled processes of microbially-mediated As speciation changes and Fe-mineral transformation remains unclear. Our study therefore incubated As(V)-associated goethite with different As(V)-reducing bacteria at a range of pH. Results show that As reduction was most prominent at pH 7 as the bacterial growth was optimal. However, aqueous As concentration was the lowest (0.8-3.7 mg/L), due to rapid microbial Fe(II) formation at pH 7 triggered secondary mineralization and significant As-readsorption. Our study provides the first spectroscopic evidence for mineral-phase temporal evolution, and indicates in the presence of phosphate, vivianite will precipitate first and adsorb large amount of As (III) (40-44% of solid As). Thereafter, continuously increased Fe(II) may catalyze lepidocrocite and eventually magnetite formation, which further sequestrate aqueous As(III). Conversely, at pH 5 and 9, bacterial growth was inhibited, the corresponding lower microbially-derived Fe(II) concentrations caused no secondary minerals formation. Released As(III) was therefore largely remained in solution (6-9.7 mg/L). Our study demonstrates that As-bound Fe(III)-(oxyhydr)oxides could pose greater risks under acidic or alkaline conditions in biotic reactions. Additionally, bacterial species could strongly impact Fe-mineral transformation pathways and As solid-solution redistribution.
Department土壤环境科学实验室
KeywordArsenate-reducing bacteria Fe(III) mineral evolution Arsenic redistribution pH conditions Bacteria species
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/45111
Collection土壤环境科学实验室
Recommended Citation
GB/T 7714
Cai, Xiaolin,Yin, Naiyi,Wang, Pengfei,et al. Arsenate-reducing bacteria-mediated arsenic speciation changes and redistribution during mineral transformations in arsenate-associated goethite[J]. JOURNAL OF HAZARDOUS MATERIALS,2020,398:1-4.
APA Cai, Xiaolin,Yin, Naiyi,Wang, Pengfei,Du, Huili,Liu, Xiaotong,&Cui, Yanshan.(2020).Arsenate-reducing bacteria-mediated arsenic speciation changes and redistribution during mineral transformations in arsenate-associated goethite.JOURNAL OF HAZARDOUS MATERIALS,398,1-4.
MLA Cai, Xiaolin,et al."Arsenate-reducing bacteria-mediated arsenic speciation changes and redistribution during mineral transformations in arsenate-associated goethite".JOURNAL OF HAZARDOUS MATERIALS 398(2020):1-4.
Files in This Item: Download All
File Name/Size DocType Version Access License
Arsenate-reducing ba(5066KB)期刊论文出版稿开放获取CC BY-NC-SAView Download
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Cai, Xiaolin]'s Articles
[Yin, Naiyi]'s Articles
[Wang, Pengfei]'s Articles
Baidu academic
Similar articles in Baidu academic
[Cai, Xiaolin]'s Articles
[Yin, Naiyi]'s Articles
[Wang, Pengfei]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Cai, Xiaolin]'s Articles
[Yin, Naiyi]'s Articles
[Wang, Pengfei]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: Arsenate-reducing bacteria-mediated arsenic speciation changes and redistribution during mineral transformations in arsenate-associated goethite.pdf
Format: Adobe PDF
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.