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Mobilization and transformation of arsenic from ternary complex OM-Fe (III)-As(V) in the presence of As(V)-reducing bacteria
Cai, Xiaolin; Wang, Pengfei; Li, Zejiao; Li, Yan; Yin, Naiyi; Du, Huili; Cui, Yanshan
2020-01-05
Source PublicationJOURNAL OF HAZARDOUS MATERIALS
ISSN0304-3894
Volume381Pages:1-10
AbstractOrganic matter (OM) was proved to have a high affinity for arsenic (As) in the presence of ferric iron (Fe(III)), the formed ternary complex OM-Fe(III)-As(V) were frequently studied before; however, the mobilization and transformation of As from OM-Fe(III)-As(V) in the presence of As(V)-reducing bacteria remains unclear. Two different strains (Desulfitobacterium sp. DJ-3, Exiguobacterium sp. DJ-4) were incubated with OM-Fe(III)-As(V) to assess the biotransformation of As and Fe. Results showed that Desulfitobacterium sp. DJ-3 could substantially stimulate the reduction and release of OM-Fe complexed As(V) and resulted in notable As(III) release (30 mg/L). The linear combination fitting result of k(3)-weighted As K-edge EXAFS spectra showed that 56% of OM-Fe-As(V) was transformed to OM-Fe-As(III) after 144 h. Besides, strain DJ-3 could also reduce OM complexed Fe(III), which lead to the decomposition of ternary complex and the release of 11.8 mg/g Fe(II), this microbial Fe(III) reduction process has resulted in 11% more As liberation from OM-Fe(III)-As(V) than without bacteria. In contrast, Exiguobacterium sp. DJ-4 could only reduce free As(V) but cannot stimulate As release from the complex. Our study provides the first evidence for microbial As reduction and release from ternary complex OM-Fe(III)-As(V), which could be of great importance in As geochemical circulation.d
Department土壤环境科学实验室
KeywordTernary complex Humic acid Arsenate-reducing bacteria Arsenic mobilization Siderite
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/45122
Collection土壤环境科学实验室
Recommended Citation
GB/T 7714
Cai, Xiaolin,Wang, Pengfei,Li, Zejiao,et al. Mobilization and transformation of arsenic from ternary complex OM-Fe (III)-As(V) in the presence of As(V)-reducing bacteria[J]. JOURNAL OF HAZARDOUS MATERIALS,2020,381:1-10.
APA Cai, Xiaolin.,Wang, Pengfei.,Li, Zejiao.,Li, Yan.,Yin, Naiyi.,...&Cui, Yanshan.(2020).Mobilization and transformation of arsenic from ternary complex OM-Fe (III)-As(V) in the presence of As(V)-reducing bacteria.JOURNAL OF HAZARDOUS MATERIALS,381,1-10.
MLA Cai, Xiaolin,et al."Mobilization and transformation of arsenic from ternary complex OM-Fe (III)-As(V) in the presence of As(V)-reducing bacteria".JOURNAL OF HAZARDOUS MATERIALS 381(2020):1-10.
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