Kinetic control on the formation of tooeleite, schwertmannite and jarosite by Acidithiobacillus ferrooxidans strains in an As(III)-rich acid mine water

Metabolic diversity among main microorganisms inside an arsenic-rich ecosystem revealed by meta- and proteo-genomics

“…(CARN2), associated with metabolisms such as iron oxidation and sulfur oxidation by Acidithiobacillus sp. (CARN5) and the Gallionella-related strain (CARN7), seems to be of prime importance in the co-precipitation of these inorganic elements, leading to the partial but efficient attenuation of this arsenic-contaminated ecosystem Casiot et al, 2003;Duquesne et al, 2003;Egal et al, 2009Egal et al, , 2010. Other microorganisms, in particular 'Candidatus Fodinabacter communificans,' may recycle organic compounds released by others or provide them with essential cofactors, improving their biomineralization activities.…”

“…This natural process of attenuation seems to be mainly due to microbial metabolism, leading to the oxidation of iron and arsenic into Fe(III) and As(V), and their co-precipitation with sulfur. In addition, laboratory experiments suggest that bacteria belonging to Thiomonas or Acidithiobacillus genera are involved in this process in situ Casiot et al, 2003;Duquesne et al, 2003;Morin et al, 2003;Egal et al, 2009). However, 16S-based community analyses have revealed that other genera are present in this ecosystem (Duquesne et al, 2003(Duquesne et al, , 2008Bruneel et al, 2003Bruneel et al, , 2006Bruneel et al, , 2008Bruneel et al, , 2011.…”

Mineral-Aqueous Solution Interfaces and Their Impact on the Environment

“…Recent experimental studies (Egal et al ., 2009) revealed that the succession of As(III)-Fe(III) mineral phases that formed through time (amorphous phases, schwertmannite, jarosite, and tooeleite) differs from one strain of A. ferrooxidans to another . It is interesting that neither tooeleite nor As(III)-rich schwertmannite formed without bacteria in the AMD water used in this study .…”

Arsenic-Microbe-Mineral Interactions in Mining-Affected Environments

“…For example, the oxidation of Fe(II), contained in sterilized acid mine drainage water containing hundreds of mg of Fe(II) and tens of mg of As [mainly As(III)], by various Acidithiobacillus ferrooxidans strains results in the trapping of As(III) by newly precipitated Fe(III) minerals [27]. X-ray Diffraction (XRD) and Extended X-Ray Absorption Fine Structure (EXAFS) spectroscopic analysis showed that tooeleite and As(III)-sorbed schwertmannite are formed in the presence of the bacteria in the acid mine drainage (AMD) water.…”

“…The most common of these occurs in mine wastes include Fe oxides and hydroxides (Table 1) [2,5,14,25], and minerals of the jarosite family [4,5,19,25,26]. The dominant form of As in these secondary phases is As(V), but As(III) has been reported in roaster oxide phases [12] (Table 1), in secondary oxide and oxyhydroxide phases (claudetite, manganarsite, Table 1) in an underground gold mine [11] and in products of experiments involving bacteria and acid mine drainage water bacteria-acid mine drainage water experiments [27].…”