Page 80 - 2017地大报告电子书

2017

ediments into groundwater
作 者 : Wang Jianing; Zeng Xian-Chun*; Zhu Xianbin; Chen Xiaoming; Zeng Xin；Mu
Yao; Yang Ye; Wang Yanxin

JOURNAL OF HAZARDOUS MATERIALS 卷 : 339 页 : 409-417 出版年 : OCT 5 2017

摘 要 : Dissimilatory arsenate-respiring prokaryotes (DARPs) play key roles
in the mobilization
and release of arsenic from mineral phase into groundwater; however, little is known about

how environmental factors influence
these processes. This study aimed to

explore the effects of sulfate
on the dissolution and release o

f insoluble arsenic. We collected high-
arsenic sediment samples

from different depths in
Jianghan Plain. Microcosm assays

indicated that the microbial
communities from thesamples significantly

catalyzed the dissolution, reduction and rel
ease of

arsenic and iron from the sediments. Remarkably, when sulfate was
added into the microcosms,

the microorganisms-mediated release of arsenic and iron was significantly increased.
To further explore the mechanism of this finding, we isolated a novel DARP, Citrobacter sp.

JH001, from
the samples. Arsenic release assays showed that JH001 can catalyze the dissolution, reduction

and release of arsenic and ironfrom the sediments, and the presence of sulfate in the microco
sms also caused a significant increase in the JH001-mediated dissolution and release of arsenic and

iron. Quantitative PCR analysis for the functional gene abundances showed that sulfate
significantly increased the arsenate-respiring reductase gene abundances in the microcosms. Thus,

it can be concluded that sulfate significantly enhances the arsenate-respiring bacteria-mediated
arsenic contamination in groundwater. (C) 2017 Elsevier B.V. All rights reserved.

论文链接：https://doi.org/10.1016/j.jhazmat.2017.06.052

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