Stimulation of Fe(II) Oxidation, Biogenic Lepidocrocite Formation, and Arsenic Immobilization by Pseudogulbenkiania Sp. Strain 2002

• DOI: 10.1021/acs.est.6b00562
• Publication Date: 2016-05-25T21:57:18Z
• Authors: Wei Xiu; Huaming Guo; Jiaxing Shen; Shuai Liu; Susu Ding; Weiguo Hou; Jie Ma; Hailiang Dong
• Keywords: Lepidocrocite; Oxidizing agent

An anaerobic nitrate-reducing Fe(II)-oxidizing bacterium, Pseudogulbenkiania sp. strain 2002, was used to investigate As immobilization by biogenic Fe oxyhydroxides under different initial molar ratios of Fe/As in solutions. Results showed that Fe(II) effectively oxidized, mainly forming lepidocrocite, which immobilized more As(III) than As(V) without changing the redox state As. When were kept constant, higher concentrations with Asimmobilized/Feprecipitated lepidocrocite. EXAFS analysis variations did not change As-Fe complexes (bidentate binuclear ((2)C)) a fixed or concentration 13.3 μM. On other hand, but induced co-occurrence bidentate and mononuclear ((2)E) monodentate ((1)V) for As(V)-treated series, respectively. The coexistence (2)C (2)E (or (1)V complexes) could contribute removal experimental series at same ratio. Simultaneous soluble nitrate bacteria provides feasible approach situ remediation As-nitrate cocontaminated groundwater.