Reductive Dissolution of Jarosite by Acidiphilium cryptum in Presence of Chelating Agents and Dissolved Iron

Ernesto González, Jesús Ángel Muñoz, María Luisa Blázquez, Felisa González, Antonio Ballester

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

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 languageEnglish
Pages (from-to)355-361
Number of pages7
JournalGeomicrobiology Journal
Volume34
Issue number4
DOIs
StatePublished - 21 Apr 2017
Externally publishedYes

Keywords

  • Acidiphilium cryptum
  • iron chelates
  • jarosite
  • ligand
  • redox mediator

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