Abstract
The mutual effects of Acidiphilium cryptum, nine ligands and dissolved iron on jarosite dissolution were studied in a 23 full factorial experiment. Ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA) and oxalic acid were able to dissolve jarosite chemically, but bacterial action enhanced this dissolution; from 88 ± 1, 46 ± 0 and 36 ± 0 µmol/L d to 129 ± 3, 177 ± 5 and 106 ± 14 µmol/L d, respectively. Oxalate and NTA exhibited a synergistic effect with dissolved iron and bacteria that may be explained by a model in which iron complexes behave as redox mediators in the microbial respiration in which jarosite, a solid substrate, serves as terminal electron acceptor.
Original language | English |
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Pages (from-to) | 355-361 |
Number of pages | 7 |
Journal | Geomicrobiology Journal |
Volume | 34 |
Issue number | 4 |
DOIs | |
State | Published - 21 Apr 2017 |
Keywords
- Acidiphilium cryptum
- iron chelates
- jarosite
- ligand
- redox mediator