title: Arsenate reduction and mobilization in the presence of indigenous aerobic bacteria obtained from high arsenic aquifers of the Hetao basin, Inner Mongolia.
abstract: Intact aquifer sediments were collected to obtain As-resistant bacteria from the Hetao basin. Two strains of aerobic As-resistant bacteria (Pseudomonas sp. M17-1 and Bacillus sp. M17-15) were isolated from the aquifer sediments. Those strains exhibited high resistances to both As(III) and As(V). Results showed that both strains had arr and ars genes, and led to reduction of dissolved As(V), goethite-adsorbed As(V), scorodite As(V) and sediment As(V), in the presence of organic carbon as the carbon source. After reduction of solid As(V), As release was observed from the solids to solutions. Strain M17-15 had a higher ability than strain M17-1 in reducing As(V) and promoting the release of As. These results suggested that the strains would mediate As(V) reduction to As(III), and thereafter release As(III), due to the higher mobility of As(III) in most aquifer systems. The processes would play an important role in genesis of high As groundwater.
authors: State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, PR China; School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, PR China. Electronic address: hmguo@cugb.edu.cn.
authors: Huaming
authors: H
authors: Guo
authors: State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, PR China; School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, PR China; Shanxi Conservancy Technical Institute, Yuncheng 044004, PR China.
authors: Zeyun
authors: Z
authors: Liu
authors: School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, PR China.
authors: Susu
authors: S
authors: Ding
authors: School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, PR China.
authors: Chunbo
authors: C
authors: Hao
authors: State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, PR China; School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, PR China.
authors: Wei
authors: W
authors: Xiu
authors: State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, PR China.
authors: Weiguo
authors: W
authors: Hou
mesh_terms: D000327:Adsorption; D001149:Arsenates / Q000378:metabolism*; D001151:Arsenic / Q000378:metabolism*; D001407:Bacillus / Q000235:genetics / Q000378:metabolism*; D002244:Carbon / Q000378:metabolism; D002681:China; D005798:Genes, Bacterial; D019015:Geologic Sediments / Q000382:microbiology; D060587:Groundwater / Q000382:microbiology; D010084:Oxidation-Reduction; D011549:Pseudomonas / Q000235:genetics / Q000378:metabolism*; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D001149:Arsenates; D014874:Water Pollutants, Chemical; D002244:Carbon; D001151:Arsenic; C025657:arsenic acid
keywords: Arsenic species; Biogeochemistry; Hetao basin; Indigenous microorganism; Microbial; Redox