Arsenic binding to iron(II) minerals produced by an iron(III)-reducing Aeromonas strain isolated from paddy soil.
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.
Wang
Xin-Jun
XJ
State Key Lab of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 10085, China.
Chen
Xue-Ping
XP
Kappler
Andreas
A
Sun
Guo-Xin
GX
Zhu
Yong-Guan
YG
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
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