title: Arsenic binding to iron(II) minerals produced by an iron(III)-reducing Aeromonas strain isolated from paddy soil.
abstract: An iron reducing bacterial strain was isolated from a paddy soil and identified as a member of the Aeromonas group by 16S rRNA gene sequence analysis. When the cells were growing with dissolved Fe(III) as electron acceptor in the presence of As(V), Fe(II) minerals (siderite and vivianite) were formed and dissolved As was removed efficiently from solution. When the cells were growing with the Fe(III) hydroxide mineral (ferrihydrite) as electron acceptor in the presence of As(V), ferrihydrite was reduced and dissolved As(V) concentrations decreased sharply. Our results demonstrated firstly that members of the Aeromonas group can reduce Fe(III) in paddy soils, and secondly that iron reduction does not necessarily lead to arsenic mobilization. However, As immobilization can occur in environments that contain significant concentrations of counter ions such as bicarbonate and phosphate.
authors: State Key Lab of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 10085, China.
authors: Xin-Jun
authors: XJ
authors: Wang
authors: Xue-Ping
authors: XP
authors: Chen
authors: Andreas
authors: A
authors: Kappler
authors: Guo-Xin
authors: GX
authors: Sun
authors: Yong-Guan
authors: YG
authors: Zhu
mesh_terms: D000333:Aeromonas / Q000302:isolation & purification* / Q000378:metabolism; D001149:Arsenates / Q000378:metabolism; D001151:Arsenic / Q000737:chemistry*; D001673:Biodegradation, Environmental; D002254:Carbonates / Q000737:chemistry; D005290:Ferric Compounds / Q000737:chemistry*; D005296:Ferrous Compounds / Q000737:chemistry; D010710:Phosphates / Q000378:metabolism; D012329:RNA, Bacterial / Q000032:analysis; D012336:RNA, Ribosomal, 16S / Q000032:analysis; D017423:Sequence Analysis, RNA; D012987:Soil / Q000032:analysis*; D012988:Soil Microbiology
chemical_list: D001149:Arsenates; D002254:Carbonates; D005290:Ferric Compounds; D005296:Ferrous Compounds; D010710:Phosphates; D012329:RNA, Bacterial; D012336:RNA, Ribosomal, 16S; D012987:Soil; C092844:ferric oxyhydroxide; C486982:siderite; D001151:Arsenic; C025657:arsenic acid